BTM7745G [INFINEON]
High Current H-Bridge Trilith IC 3G; 大电流H桥Trilith IC 3G
| 型号： | BTM7745G |
| 厂家： | 
Infineon |
| 描述： | High Current H-Bridge Trilith IC 3G |
| 文件： | 总24页 (文件大小：1123K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet, Rev. 1.0, May 2010
BTM7745G
High Current H-Bridge
Trilith IC 3G
Automotive Power
High Current H-Bridge
BTM7745G
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1
2
3
4
4.1
4.2
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5
General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
5.2
5.3
6
6.1
6.2
Block Description and Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Supply Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Stages - Static Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Switching Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Stages - Dynamic Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Overvoltage Lock Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Undervoltage Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Overtemperature Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Current Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Short Circuit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical Characteristics - Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Control and Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Input Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dead Time Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Status Flag Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Characteristics - Control and Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.1
6.2.2
6.2.3
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.3.6
6.4
6.4.1
6.4.2
6.4.3
6.4.4
6.4.5
7
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.1
Application and Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8
9
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Data Sheet
2
Rev. 1.0, 2010-05-28
High Current H-Bridge
Trilith IC 3G
BTM7745G
1
Overview
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated high current H-Bridge
Path resistance of max. 500 mΩ @ 150 °C (typ. 250 mΩ @ 25 °C)
Low quiescent current of typ. 5µA @ 25 °C
Current limitation level of 12 A typ. (6 A min.)
Driver circuit with logic inputs
Status flag diagnosis
Overtemperature shut down with latch behaviour
Overvoltage lock out
Undervoltage shut down
Switch-mode current limitation for reduced power dissipation in overcurrent situation
Integrated dead time generation
Operation up to 28V
Green Product (RoHS compliant)
AEC Qualified
PG-DSO-36-29
Description
The BTM7745G is a fully integrated high current H-bridge for motor drive applications. It contains two p-channel
highside MOSFETs and two n-channel lowside MOSFETs with an integrated driver IC in one package. Due to the
p-channel highside switches the need for a charge pump is eliminated thus minimizing EMI. Interfacing to a
microcontroller is made easy by the integrated driver IC which features logic level inputs, diagnosis,dead time
generation and protection against overtemperature, overvoltage, undervoltage, overcurrent and short circuit.
The BTM7745G provides an optimized solution for protected high current motor drives with very low board space
consumption.
Type
Package
Marking
BTM7745G
PG-DSO-36-29
BTM7745G
Data Sheet
3
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Diagram
2
Block Diagram
VS
VS
Overtemp.
detection
HS1
HS2
Undervolt.
detection
Overvolt.
detection
Overcurr.
Detection
HS1
Overcurr.
Detection
HS2
Gate Driver
HS
Gate Driver
HS
HS off
LS off
LS off
HS off
Digital Logic
OUT1
OUT2
Gate Driver
LS
Gate Driver
LS
Overcurr.
Detection
LS1
Overcurr.
Detection
LS2
LS1
LS2
GND
GND
IN1
IN2
INH
ST
Figure 1
Block Diagram
3
Terms
following figure shows the terms used in this data sheet.
VDS(HS)
VDS(HS)
IS , -ID(HS)
VS
VS
IIN1
IN1
IN2
INH
ST
VIN1
IOUT , ID, IL
IIN2
OUT1
VOUT
VIN2
VSD(LS)
IINH
IOUT , ID, IL
VINH
OUT2
VOUT
IST
VST
VSD(LS)
GND
IGND , ID(LS)
Figure 2
Terms
Data Sheet
4
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Pin Configuration
4
Pin Configuration
4.1
Pin Assignment
OUT1
OUT1
1
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
OUT1
OUT1
OUT1
OUT1
VS
2
3
OUT1
OUT1
GND
4
5
6
VS
GND
GND
7
VS
GND
IN1
8
VS
9
ST
IN2
10
11
12
13
14
15
16
17
18
INH
VS
GND
GND
GND
GND
OUT2
OUT2
OUT2
OUT2
VS
VS
VS
OUT2
OUT2
OUT2
OUT2
Figure 3
Pin Configuration BTM7745G
4.2
Pin Definitions and Functions
Pins written in bold type need power wiring.
Pin
Symbol
OUT1
GND
IN1
Function
1..4, 33..36
Output of first half bridge
Ground
5..8, 23..26
9
Input of first half bridge
Input of second half bridge
10
IN2
11..14, 29..32 VS
Supply, all pins to be connected and shorted externally
Output of second half bridge
15..22
27
OUT2
INH
ST
Inhibit pin, to set device in sleep/stand-by mode
Status signal, open drain output
28
Data Sheet
5
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
General Product Characteristics
5
General Product Characteristics
5.1
Absolute Maximum Ratings
Absolute Maximum Ratings 1)
Tj = -40 °C to +150 °C; all voltages with respect to ground (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit Conditions
Min.
Max.
45
5.1.1
5.1.2
Supply voltage
VS
-0.3
V
V
–
–
Logic Input Voltage
VIN1,VIN2, -0.3
5.5
VINH
5.1.3
HS/LS continuous drain current
ID(HS)
ID(LS)
-3.2
3.2
A
TC < 85°C
switch active
5.1.4
5.1.5
5.1.6
Voltage at ST pin
VST
IST
IST
-0.3
0
45
2
V
–
–
ST pin continuous current
ST pin peak current
mA
mA
0
4
tpeak < 10µs
Thermal Maximum Ratings
–
–
5.1.7
5.1.8
Junction temperature
Storage temperature
Tj
-40
-55
150
150
°C
°C
Tstg
ESD Susceptibility
5.1.9 ESD susceptibility
HBM2)
VESD
kV
IN1, IN2, ST, INH
OUT1, OUT2, GND, VS
-2
-4
2
4
1) Not subject to production test, specified by design.
2) HBM according to EIA/JESD 22-A 114B (1.5 kΩ, 100pF)
Note:Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Note:Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are
not designed for continuous repetitive operation.
Data Sheet
6
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
General Product Characteristics
Maximum Single Pulse Current
20
15
10
5
0
0,0001
0,001
0,01
0,1
1
10
100
tpulse [s]
Figure 4
BTM7745G Maximum Single Pulse Current (TC = Tj(0) < 85°C)
This diagram shows the maximum single pulse current that can be driven for a given pulse time tpulse. The
maximum reachable current may be smaller depending on the current limitation level. Pulse time may be limited
due to thermal protection of the device.
5.2
Functional Range
Pos.
Parameter
Symbol
Limit Values
Unit
Conditions
Min.
Max.
5.2.1
5.2.2
Supply Voltage Range for
Normal Operation
VS(nor)
VS(ext)
8
18
V
V
VS pins shorted
Extended Supply Voltage Range
for Operation
5.5
28
VS pins shorted;
Parameter
deviations possible;
1)
5.2.3
Junction Temperature
Tj
-40
150
°C
–
1) Overtemperature protection available up to supply voltage VS = 18V.
Note:Within the functional range the IC operates as described in the circuit description. The electrical
characteristics are specified within the conditions given in the related electrical characteristics table.
Data Sheet
7
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
General Product Characteristics
5.3
Thermal Resistance
Note:This thermal data was generated in accordance with JEDEC JESD51 standards. For more information, go
to www.jedec.org.
Pos.
Parameter
Symbol
Limit Values
Unit Conditions
Min.
Typ.
Max.
1)
5.3.1
Thermal Resistance
Junction to Soldering Point, Low Side Switch
RthjSP(LS) = ΔTj(LS)/ Pv(LS)
RthjSP(LS)
–
–
29
29
29
K/W
1)
5.3.2
5.3.3
Thermal Resistance
Junction to Soldering Point, High Side Switch
RthjSP(HS) = ΔTj(HS)/ Pv(HS)
RthjSP(HS)
–
–
–
–
K/W
1)
Thermal Resistance
RthjSP
K/W
Junction to Soldering Point, both switches
RthjSP= max[ΔTj(HS), ΔTj(LS)] /
(Pv(HS) + Pv(LS)
)
1) 2)
5.3.4
Thermal Resistance
Junction-Ambient
Rthja
–
46
–
K/W
;
1) Not subject to production test, specified by design.
2) Specified Rthja value is according to Jedec JESD51-2, -7 at natural convection on FR4 2s2p board; The product
(chip+package) was simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu).
Transient thermal impedance Zthja
Figure 5 is showing the typical transient thermal impedance of high side or low side switch of BTM7745G mounted
according to JEDEC JESD51-7 at natural convection on FR4 2s2p board. The device (chip+package) was
simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu). For the
simulation each chip was separately powered with 1W at an ambient temperature Ta of 85°C.
50
45
40
35
30
25
20
15
10
5
High side sw itch / Low side sw itch
0
0,001
0,01
0,1
1
10
100
1000
tpulse [s]
Figure 5
Typical transient thermal impedance of BTM7745G on JESD51-7 2s2p board
(1W each chip (separately heated), Ta = 85°C, single pulse)
Data Sheet
8
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6
Block Description and Characteristics
6.1
Supply Characteristics
VS = 8 V to 18 V, Tj = -40 °C to +150 °C, IL = 0A, VS pins shorted, all voltages with respect to ground, positive
current flowing into pin (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Test Conditions
Min.
Typ.
Max.
General
6.1.1
Supply Current
IS(on)
–
5
9.5
mA
VINH or VIN1 or VIN2 = 5 V
DC-mode
normal operation
(no fault condition)
6.1.2
Quiescent Current
IS(off)
–
–
5
–
15
30
µA
µA
VINH = VIN1 = VIN2 = 0 V
Tj < 85 °C; 1)
VINH = VIN1 = VIN2 = 0 V
1) Not subject to production test, specified by design.
10
9
8
7
6
5
4
3
2
1
0
-40
0
40
80
120
160
[°C]
T
Figure 6
Typical Quiescent Current vs. Junction Temperature (typ. @ VS = 13.5V)
Data Sheet
9
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.2
Power Stages
The power stages of the BTM7745G consist of p-channel vertical DMOS transistors for the high side switches and
n-channel vertical DMOS transistors for the low side switches. All protection and diagnostic functions are located
in a separate control chip. Both switches, high side and low side, allow active freewheeling and thus minimize
power dissipation in the forward operation of the integrated diodes.
The on state resistance RON is dependent on the supply voltage VS as well as on the junction temperature Tj. The
typical on state resistance characteristics are shown in Figure 7.
Low Side Switch
High Side Switch
250
400
350
300
250
200
150
10 0
50
200
150
10 0
50
Tj = 150°C
Tj = 150°C
Tj = 25°C
Tj = -40°C
Tj = 25°C
Tj = -40°C
0
0
4
8
12
16
20
24
28
4
8
12
16
20
24
28
VS [V]
VS [V]
Figure 7
Typical On State Resistance vs. Supply Voltage
Data Sheet
10
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.2.1
Power Stages - Static Characteristics
VS = 8 V to 18 V, Tj = -40 °C to +150 °C, VS pins shorted, all voltages with respect to ground, positive current
flowing into pin (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Test Conditions
Min.
Typ.
Max.
High Side Switch - Static Characteristics
6.2.1
6.2.2
6.2.3
On state high side resistance RON(HS)
mΩ
IOUT = 1 A
VS = 13.5 V
Tj = 25 °C; 1)
Tj = 150 °C
–
–
100
140
–
190
Leakage current high side
IL(LKHS)
µA
V
VINH = VIN1 = VIN2 = 0 V
VOUT = 0 V
Tj < 85 °C; 1)
–
–
–
–
1
5
Tj = 150 °C
Reverse diode
forward-voltage high side 2)
VDS(HS)
IOUT = -1 A
–
–
–
0.9
0.8
0.6
–
–
0.8
Tj = -40 °C; 1)
Tj = 25 °C; 1)
Tj = 150 °C
Low Side Switch - Static Characteristics
6.2.4
6.2.5
6.2.6
On state low side resistance RON(LS)
mΩ
µA
V
IOUT = -1 A
VS = 13.5 V
Tj = 25 °C; 1)
Tj = 150 °C
–
–
150
250
–
300
Leakage current low side
-IL(LKLS)
VINH = VIN1 = VIN2 = 0 V
VOUT = VS
Tj < 85 °C; 1)
–
–
–
–
1
3
Tj = 150 °C
Reverse diode
forward-voltage low side 2)
VSD(LS)
IOUT = 1 A
–
–
–
0.9
0.8
0.6
–
–
0.8
Tj = -40 °C; 1)
Tj = 25 °C; 1)
Tj = 150 °C
1) Not subject to production test, specified by design.
2) Due to active freewheeling diode is conducting only until related switch is on.
Data Sheet
11
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.2.2
Switching Times
IN
t
tdf(HS) tf(HS)
tdr(HS)
tr(HS)
VOUT
90%
90%
ΔVOUT
ΔVOUT
40%
40%
t
Figure 8
Definition of switching times high side (Rload to GND)
IN
t
tdf(LS)
tf(LS)
tdr(LS) tr(LS)
VOUT
60%
60%
ΔVOUT
ΔVOUT
10%
10%
t
Figure 9
Definition of switching times low side (Rload to VS)
Due to the timing differences for the rising and the falling edge there will be a slight difference between the length
of the input pulse and the length of the output pulse. It can be calculated using the following formulas:
•
•
ΔtHS = (tdr(HS) + 0.2 tr(HS)) - (tdf(HS) + 0.8 tf(HS)
ΔtLS = (tdf(LS) + 0.2 tf(LS)) - (tdr(LS) + 0.8 tr(LS)).
)
Data Sheet
12
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.2.3
Power Stages - Dynamic Characteristics
VS = 13.5V, Tj = +150 °C,RLoad = 12 Ω, VINH = 5V, VS pins shorted, all voltages with respect to ground, positive
current flowing into pin (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Test Conditions
Min.
Typ.
Max.
High Side Switch Dynamic Characteristics
6.2.7
6.2.8
Rise-time of HS
Slew rate HS on
tr(HS)
5
–
15
25
–
µs
–
–
ΔVOUT
/
0.4
V/µs
tr( HS)
6.2.9
Switch on delay time HS
tdr(HS)
tf(HS)
50
5
95
15
0.4
140
25
–
µs
–
–
–
6.2.10 Fall-time of HS
6.2.11 Slew rate HS off
µs
-ΔVOUT
/
–
V/µs
tf(HS)
6.2.12 Switch off delay time HS
tdf(HS)
25
55
80
µs
–
Low Side Switch Dynamic Characteristics
6.2.13 Rise-time of LS
tr(LS)
10
–
20
30
–
µs
–
–
6.2.14 Slew rate LS switch off
ΔVOUT
/
0.4
V/µs
tr(LS)
6.2.15 Switch off delay time LS
6.2.16 Fall-time of LS
tdr(LS)
tf(LS)
30
10
–
60
20
0.4
90
30
–
µs
–
–
–
µs
6.2.17 Slew rate LS switch on
-ΔVOUT
/
V/µs
tf(LS)
6.2.18 Switch on delay time LS
tdf(LS)
40
80
120
µs
–
6.3
Protection Functions
The device provides integrated protection functions. These are designed to prevent IC destruction under fault
conditions described in the data sheet. Fault conditions are considered as “outside” normal operating range.
Protection functions are not to be used for continuous or repetitive operation, with the exception of the current
limitation (Chapter 6.3.4). Overvoltage, overtemperature and overcurrent are indicated by switching the open
drain output ST to low. Although the slew rate is defined as above (Chapter 6.2.3), in case of overvoltage and
overcurrent the device will have a higher slew rate of typically 11V/µs.
In the following the protection functions are listed in order of their priority. Overvoltage lock out overrides all other
error modes.
6.3.1
Overvoltage Lock Out
To assure a high immunity against overvoltages (e.g. load dump conditions) the device shuts both lowside
MOSFETs off and turns both highside MOSFET on, if the supply voltage VS is exceeding the over voltage
protection level VOV(OFF). The IC operates in normal mode again with a hysteresis VOV(HY) if the supply voltage
decreases below the switch-on voltage VOV(ON). This behavior of the BTM7745G will lead to freewheeling in
highside during over voltage.
Data Sheet
13
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.3.2
Undervoltage Shut Down
To avoid uncontrolled motion of the driven motor at low voltages the device shuts off (both outputs are tri-state),
if the supply voltage VS drops below the switch-off voltage VUV(OFF). In this case all latches will be reset. The IC
becomes active again with a hysteresis VUV(HY) if the supply voltage rises above the switch-on voltage VUV(ON)
.
6.3.3
Overtemperature Protection
The BTM7745G is protected against overtemperature by integrated temperature sensors. Each half bridge, which
consists of one high side and one low side switch, is protected by one temperature sensor located in the high side
switch. Both temperature sensors function independently. A detection of overtemperature through temperature
sensor leads to a shut down of both switches in the half bridge. This state is latched until the device is reset by a
low signal with a minimum length of treset simultaneously at the INH pin and both IN pins, provided that its
temperature has decreased at least the thermal hysteresis ΔT in the meantime.
Overtemperature protection is available up to supply voltage VS = 18V.
For sufficient over temperature protection please consider also operation below the limitations outlined in Figure
4 and Figure 5.
Repetitive use of the overtemperature protection might reduce lifetime.
6.3.4
Current Limitation
The current in the bridge is measured in all four switches. As soon as the current in forward direction in one switch
is reaching the limit ICLx, this switch is deactivated for tCLS. In case of INH = 5V (high) the other switch of the same
half bridge is activated for the same time (tCLS). During that time all changes at the related IN pin are ignored.
However, the INH pin can still be used to switch all MOSFETs off. After tCLS the switches return to their initial
setting. The error signal at the ST pin is reset after 1.5 * tCLS if no overcurrent state is detected in the meantime.
Unintentional triggering of the current limitation by short current spikes (e.g. inflicted by EMI coming from the
motor) is suppressed by internal filter circuitry. Due to thresholds and reaction delay times of the filter circuitry the
effective current limitation level ICLx depends on the slew rate of the load current di/dt as shown in Figure 11.
IL
tCLS
1.5*tCLS
ICLx
ICLx0
O
t
VST
5V
O
t
Figure 10 Timing Diagram Current Limitation and Status Flag
Data Sheet
14
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
Low Side Switch
High Side Switch
14
13
12
14
T = -40°C
T = -40°C
j
j
13
ICLL0
ICLH0
Tj = 25°C
Tj = 25°C
Tj = 150°C
Tj = 150°C
12
11
10
11
10
0
50
100
150
0
50
100
150
dIL/dt [A/ms]
dIL/dt [A/ms]
Figure 11 Current Limitation Level vs. Current Slew Rate dIL/dt
High Side Switch
Low Side Switch
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
Tj = -40°C
T = 25°C
j
Tj = 25°C
Tj = 150°C
Tj = -40°C
Tj = 150°C
8
8
6
10
14
18
22
26
6
10
14
18
22
26
VS [V]
VS [V]
Figure 12 Typical Current Limitation Detection Levels vs. Supply Voltage
In combination with a typical inductive load, such as a motor, this results in a switched mode current limitation.
This method of limiting the current has the advantage that the power dissipation in the BTM7745G is much smaller
than by driving the MOSFETs in linear mode. Therefore it is possible to use the current limitation for a short time
without exceeding the maximum allowed junction temperature (e.g. for limiting the inrush current during motor start
up). However, the regular use of the current limitation is allowed as long as the specified maximum junction
temperature is not exceeded. Exceeding this temperature can reduce the lifetime of the device.
Data Sheet
15
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.3.5
Short Circuit Protection
The device provides embedded protection functions against
•
•
•
output short circuit to ground
output short circuit to supply voltage
short circuit of load
The short circuit protection is realized by the previously described current limitation in combination with the over-
temperature shut down (see Chapter 6.3.3) of the device.
6.3.6
Electrical Characteristics - Protection Functions
VS = 8 V to 18 V, Tj = -40 °C to +150 °C, VS pins shorted, all voltages with respect to ground, positive current
flowing into pin (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit
Test Conditions
Min.
Typ.
Max.
Over Voltage Lock Out
6.3.1
6.3.2
6.3.3
Switch-ON voltage
Switch-OFF voltage
ON/OFF hysteresis
VOV(ON)
VOV(OFF)
VOV(HY)
27.8
28
–
–
–
V
V
V
Vs decreasing
–
30
–
Vs increasing
1)
0.2
Under Voltage Shut Down
6.3.4
6.3.5
6.3.6
Switch-ON voltage
Switch-OFF voltage
ON/OFF hysteresis
VUV(ON)
VUV(OFF)
VUV(HY)
–
–
5.5
5.4
–
V
V
V
VS increasing
4.0
–
–
VS decreasing
1)
0.2
Thermal Shut Down
1); VS ≤ 18 V
6.3.7
6.3.8
6.3.9
Thermal shut down junction TjSD
temperature
155
153
175
–
200
190
°C
°C
1)
Thermal switch on junction
temperature
TjSO
1)
1)
Thermal hysteresis
ΔT
–
8
7
–
–
–
°C
6.3.10 Reset pulse at INH and IN pin treset
µs
(INH, IN1 and IN2 low)
Current Limitation
6.3.11 Current limitation detection ICLH0
6
12
16
A
VS = 13.5 V
level high side
6.3.12 Current limitation detection ICLL0
6
12
16
A
VS = 13.5 V
level low side
6.3.13 Shut off time for HS and LS tCLS
50
100
200
µs
VS = 13.5 V, Tj = 25 °C
1) Not subject to production test, specified by design.
Data Sheet
16
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.4
Control and Diagnostics
Input Circuit
6.4.1
The control inputs INx and INH consist of TTL/CMOS compatible schmitt triggers with hysteresis which control the
integrated gate drivers for the MOSFETs. To set the device in stand-by mode, INH and INx pins need to be all
connected to GND. When the INH is high, in each half bridge one of the two power switches (HSx or LSx) is
switched on, while the other power switch is switched off, depending on the status of the INx pin. When INH is low,
a high INx signal will turn the corresponding highside switches on. This provides customer the possibility to switch
on one high side switch while keeping the other switches off and therefore to do an open load detection together
with external circuitry (see also Chapter 7 - Application Information). A low on all INx and INH signal will turn off
both power switches. To drive the logic inputs no external driver is needed, therefore the BTM7745G can be
interfaced directly to a microcontroller.
6.4.2
Dead Time Generation
In bridge applications it has to be assured that the highside and lowside MOSFET are not conducting at the same
time, connecting directly the battery voltage to GND. This is assured by a circuit in the driver IC, which senses the
status of the MOSFETs to ensure that the high or low side switch can be switched on only if the corresponding
low or high side switch is completely turned off.
6.4.3
Status Flag Diagnosis
The status pin provides diagnostic signal of the device. It is an open drain output which requires a pull-up resistor.
In case of overvoltage, overtemperature and overcurrent situation the status output is switched to low. In case of
current limitation the status output is activated for 1.5 * tCLS
.
Data Sheet
17
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.4.4
Truth Table
Device State
Inputs
Outputs
Mode
INH IN1 IN2 HS1 LS1 HS2 LS2 ST
Normal operation
0
1
1
1
1
0
0
0
X
0
0
0
1
1
0
1
1
X
0
0
1
0
1
1
0
1
X
OFF OFF OFF OFF 1
OFF ON OFF ON
OFF ON ON OFF 1
Stand-by mode, reset
1
–
–
ON OFF OFF ON
ON OFF ON OFF
1
1
–
–
Open-Load detection
mode
OFF OFF ON OFF 1
ON OFF OFF OFF 1
Enable Open-load detection
Enable Open-load detection
ON OFF ON OFF
1
Over-voltage (OV)
Under-voltage (UV)
ON OFF ON OFF 0
Shut-down of LSS,
HSS activated, error detected
X
0
1
X
X
1
X
0
X
1
X
0
X
0
OFF OFF OFF OFF 1
OFF OFF OFF OFF 1
OFF OFF OFF OFF 0
UV lockout, reset
Overtemperature or
short circuit of HSS or
LSS 1)
Stand-by mode, reset of latch
X
X
1
Shut-down with latch, error
detected
Current limitation
mode half bridge 1
X
ON OFF X
X
X
X
0
0
0
Short Circuit in LS1 detected,
half bridge 2 operates in normal
mode
1
1
X
OFF ON
X
Short Circuit in HS1 detected,
half bridge 2 operates in normal
mode
0
1
1
X
0
OFF OFF X
Short Circuit in HS1 detected
Current limitation
mode half bridge 2
X
X
X
X
X
X
X
ON OFF 0
Short Circuit in LS2 detected,
half bridge 1 operates in normal
mode
1
X
1
OFF ON
0
Short Circuit in HS2 detected,
half bridge 1 operates in normal
mode
0
X
1
OFF OFF 0
Short Circuit in HS2 detected
1) In short circuit of HSS or LSS, the junction temperature will arise and as soon as the over temperature shut down threshold
is reached the device will shut down and latch the status. Short circuit of HSS and LSS itself won’t be detected as failure.
Inputs:
Switches
Status Flag ST:
0 = Logic LOW
1 = Logic HIGH
X = 0 or 1
OFF = switched off
ON = switched on
X = switched on or off
0 = Logic LOW (error)
1 = Logic HIGH (normal operation)
Data Sheet
18
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.4.5
Electrical Characteristics - Control and Diagnostics
VS = 8 V to 18 V, Tj = -40 °C to +150 °C, VS pins shorted, all voltages with respect to ground, positive current
flowing into pin (unless otherwise specified)
Pos.
Parameter
Symbol
Limit Values
Unit Test Conditions
Min.
Typ.
Max.
Control Inputs (IN and INH)
6.4.1
6.4.2
High level threshold voltage VINH(H)
,
–
1.6
1.4
2
–
V
V
–
–
INH, IN1, IN2
VIN1(H), VIN2(H)
Low level threshold voltage VINH(L)
,
1.1
INH, IN1, IN2
VIN1(L), VIN2(L)
1)
6.4.3
6.4.4
Input voltage hysteresis
Input current
VINHHY,VINHY
–
–
200
30
–
mV
µA
IINH(H)
IIN1(H), IIN2(H)
IINH(L)
,
200
VIN1,VIN2,VINH = 5.5 V
6.4.5
Input current
,
–
25
125
µA
VIN1, VIN2, VINH = 0.4 V
IIN1(L), IIN2(L)
Status Signal
6.4.6
6.4.7
Status Low output voltage VST(LOW)
–
–
–
–
0.4
1
V
I
ST = 1.6 mA
Status leakage current
µA
VST = 0...28 V
IST(LK)
1) Not subject to production test, specified by design.
Data Sheet
19
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Application Information
7
Application Information
Note:The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
Microcontroller
XC866
Voltage Regulator
Reverse Polarity
Protection
I/O
Reset
Vdd
WO
I
TLE
RO
Q
4278G
VS
DZ1
10V
D
CQ
22µF
GND
R1
10kΩ
e.g.
IPD50P03P4L-11
Vss
CD
47nF
I/O
I/O
I/O
I/O I/O
I/O
RST
4.7kΩ
VS
VS
BTM7745G
CSc
HS1
INH
HS2
CS
RINH
4.7kΩ
IN1
IN2
OUT1
OUT2
RIN1
4.7kΩ
M
RIN2
4.7kΩ
LS1
ST
LS2
GND
GND
RD1
RD2
Figure 13 Application Diagram
Note:This is a very simplified example of an application circuit. The function must be verified in the real application.
7.1
Application and Layout Considerations
Due to the fast switching times for high currents, special care has to be taken during the PCB layout. Stray
inductances have to be minimized in the power bridge design as it is necessary in all switched high power bridges.
The BTM7745G has no separate pin for power ground and logic ground. Therefore it is recommended to assure
that the offset between power ground and logic ground pins of the device is minimized. It is also
necessary to ensure that all VS pins are at the same voltage level. Therefore the VS pins need to be
shorted together. Voltage differences between the VS pins may cause parameter deviations (such as reduced
current limits) up to a latched shutdown of the device with error signal on the ST pin, similar to overtemperature
shutdown.
Due to the fast switching behavior of the device in current limitation mode or overvoltage lock out a low ESR
electrolytic capacitor Cs of at least 100 µF from VS to GND is recommended. This prevents destructive voltage
peaks and drops on VS. This is recommended for both PWM and non PWM controlled applications. The value of
the capacitor must be verified in the real application.
In addition a ceramic capacitor Csc from VS to GND close to each device is recommended to provide current for
the switching phase via a low inductance path and therefore reducing noise and ground bounce. A reasonable
value for this capacitor would be about 470 nF.
Data Sheet
20
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Application Information
It is recommended to do the freewheeling in the low side path to ensure a proper function and avoid unintended
overtemperature detection and shutdown. For proper operation it is also recommended to put a pull-down resistor
RDx on each output OUTx to GND with a value in the range of e.g. 1...10 kΩ. These resistors can also be used for
open load detection.
Considerations for Open Load Detection Mode
As mentioned in Chapter 6.4.1 both high side switches can be switched on independently while all other switches
are off. This will be realized by setting the corresponding IN signal to high while INH and the other IN are low.
Device State
Inputs
Outputs
Mode
INH IN1
IN2
1
HS1 LS1 HS2 LS2 ST
Open-Load detection
mode
0
0
0
0
1
1
OFF OFF ON
OFF
OFF OFF OFF
OFF ON OFF
1
1
1
HS2 active
0
ON
ON
HS1 active
1
both HSx are active
Together with the recommended pull-down resistors on the outputs OUTx to GND this provides the possibility to
do an open load detection in H-bridge configuration.
In case of one high side is active while the other half bridge is off (HS off and LS off) a current of up to 2mA will
be sourced out of the OUT of the high ohmic half bridge. This has to be considered while choosing the right value
of the pull-down resistor.
Data Sheet
21
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Package Outlines
8
Package Outlines
0.35 x 45˚
1)
7.6-0.2
0.65
C
0.1
36x
C
0.2
0.7
SEATING PLANE
17 x 0.65 = 11.05
0.3
10.3
D
2)
0.08
0.33
M
0.17
C A-B D 36x
A
36
19
Ejector Mark
Depth 0.2 MAX.
1
18
1)
B
12.8-0.2
Index Marking
1) Does not include plastic or metal protrusion of 0.15 max. per side
2) Does not include dambar protrusion of 0.05 max. per side
PG-DSO-36-20, -29, -34, -43, -44-PO V05
1.67
Footprint
9.73
HLGF1145
Figure 14 PG-DSO-36-29 (Plastic Green Dual Small Outline Package)
Green Product (RoHS compliant)
To meet the world-wide customer requirements for environmentally friendly products and to be compliant with
government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e
Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
For further information on alternative packages, please visit our website:
Dimensions in mm
http://www.infineon.com/packages.
Data Sheet
22
Rev. 1.0, 2010-05-28
High Current H-Bridge
BTM7745G
Revision History
9
Revision History
Revision
Date
Changes
Initial version Data Sheet
1.0
2010-05-28
Data Sheet
23
Rev. 1.0, 2010-05-28
Edition 2010-05-28
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2010 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support
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相关型号：
BTM7810KAUMA1
Half Bridge Based Peripheral Driver, 42A, PSSO15, GREEN, PLASTIC, TO263, 15 PIN
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