AT1395F [ETC]
5 CHANNEL DC-DC CONVERTER FOR DSC; 5通道DC - DC转换器DSC
| 型号： | AT1395F |
| 厂家： | 
ETC |
| 描述： | 5 CHANNEL DC-DC CONVERTER FOR DSC |
| 文件： | 总18页 (文件大小：329K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Features
General Description
• Low start-up power supply voltage :1.4V(CH5) The AT1395 is a 5-channel PWM DC/DC control
• Wide supply voltage range from 2.5V to 7V
(CH1~5)
IC for low voltage applications with a soft start
function and short circuit detection function. This
IC is ideal for up conversion, down conversion,
inverting conversion (CH4 only) and up/down
conversion (using a step-up/step-down SEPIC or
Zeta system with free input and output settings). 5
channels can be built in the LQFP48 package, each
channel be controlled, and soft-start.
• High speed operation is possible: Maximum
1 MHz
• Supports for up,down, flyback and up/down
SEPIC conversion
• Supports for inverting conversion (CH4)
• Synchronized rectification on CH1,CH2
• Selectable P-Ch/N-CH MOSFETdriver
• Built-in On/Off function
The AT1395 include one comparator to generate
low-battery warning outputs. It also contains two
high efficiency topology by using synchronous
rectification PWM (It can be disable by floating
OUT1_2,OUT2_2.)
• Built-in Short-Circuit Protection.
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
Pin Assignment
Ordering Information
Part number
AT1395F
Package
LQFP48
Marking
AT1395F
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Pin Description
Pin No. Pin name
I/O Function
1
SS5
I
CH5 Soft Start Setting Capacitor
CH5 Error Amplifier Output
CH5 Error Amplifier Inverted Input
CH4 Output Driver P-ch/N-ch Control
CH4 Dead Time Control
CH4 Soft Start Setting Capacitor
CH4 Error Amplifier Output
CH4 Error Amplifier Negative Input
CH4 Error Amplifier Positive Input
CH3 Output Driver P-ch/N-ch Control
CH3 Dead Time Control
2
FB5
I
3
IN5E
SEL4
DTC4
SS4
I
4
I
5
I
6
I
7
FB4
I
8
IN4N
IN4P
SEL3
DTC3
SS3
I
9
I
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
I
I
I
CH3 Soft Start Setting Capacitor
CH3 Error Amplifier Output
CH3 Error Amplifier Inverted Input
CH5 ON/OFF Control Input
CH4 ON/OFF Control Input
CH3 ON/OFF Control Input
2.2V Regulator Output
FB3
I
IN3E
CTL5
CTL4
CTL3
VREG
VREFO
AGND
VCC
I
I
I
I
O
-
Reference bypass Input
P
P
-
Power Ground
Power Supply
VBC
Bias bypass Input
CT
-
Oscillation Frequency Setting Capacitor
Power Control Input
CTL
I
CSCP
CTL2
CTL1
IN2E
FB2
-
Timer Latch Short-Circuit Detection Capacitor Input
CH2 ON/OFF Control Input
CH1 ON/OFF Control Input
CH2 Error Amplifier Inverted Input
CH2 Error Amplifier Output
CH2 Soft Start Setting Capacitor
CH2 Dead Time Control
I
I
I
I
SS2
I
DTC2
SEL2
IN1E
FB1
I
I
CH2 Output Driver P-ch/N-ch Control
CH1 Error Amplifier Inverted Input
CH1 Error Amplifier Output
CH1 Soft Start Setting Capacitor
CH1 Dead Time Control
I
I
SS1
I
DTC1
SEL1
LBI
I
I
CH1 Output Driver P-ch/N-ch Control
Low Battery Detector Input
Low Battery Indicator
I
LBO
O
O
O
O
O
P
P
O
O
O
OUT1_1
OUT1_2
OUT2_1
OUT2_2
PVCC
PGND
OUT3
OUT4
OUT5
CH1 Main Side Output
CH1 Synchronous Rectifier Side Output
CH2 Main Side Output
CH2 Synchronous Rectifier Side Output
Drive Output Block Power Supply
Drive Output Block Ground
CH3 Output
CH4 Output
CH5 Output
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Absolute Maximum Ratings
Parameter
Symbol
Condition
Unit
Min
Max
Power supply voltage
Output current
Vcc
Io
--
--
7
V
mA
mA
mW
℃
Output pin
--
--
20
200
860
85
Output pin, Duty≦5%
Output peak current
Power dissipation
Operation temperature
Storage temperature
Io
PD
--
Ta≦25℃ (LQFP-48P)
Topr
Tstg
--
--
-30
-55
℃
125
*Semiconductor devices can be permanently damaged by application of stress in excess of absolute ratings. Do not
exceed these ratings.
Recommended Operating Conditions
Value
Parameter
Symbol
Condition
Unit
Min Typ Max
Startup power supply voltage
Power supply voltage
Vcc1 CH5
1.4
--
6.5
V
V
Vcc2 CH1 to CH4
2.5
3.3
6.5
Regulator voltage output current
Input voltage
IOR
VREG pin
-10
0
--
--
0
mA
V
VIN
IN1E to IN5E pins
Vcc-1.8
Control input voltage
VCTL CTL pin
0
--
1
--
2
2
7
15
15
V
mA
mA
OUT pin (CH1 to CH4)
Output current
Io
OUT pin (CH5)
Oscillator
fOSC
CT
Cs
CSS6 CH5
CCSCP
--
--
100
500
1000 kHz
Timing capacitor
47
--
--
100
0.1
0.1
0.1
560
1.0
1.0
1.0
pF
μF
μF
μF
CH1 to CH4
Soft start capacitor
Short detection capacitor
VREG pin capacitor
--
--
--
--
μF
CVREG
0.082
-30
0.1
25
--
T
A
℃
Operating ambient temperature
85
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Electrical Characteristics
(T =25℃, VCC=PVCC=5V)
A
Measure result
Parameter
Symbol
Condition
Unit
Min. Typ. Max.
Reference voltage block [REF]
Regulator voltage
VREG
2.15
-
2.2
0.5
2.25
-
V
△VREG
/VREG
Output voltage temperature
stability
T
A
= -30℃ to 85℃
%
Input stability
Load stability
Line VCC=2.5V to 7V
-10
-10
-
-
10
10
mV
mV
Load VREG=0mA to –1mA
Under voltage lockout block [U.V.L.O]
Threshold voltage(CH1~CH4)
Hysteresis width(CH1~CH4)
Reset voltage(CH1~CH4)
VTH
VH
2.0
0.05
-
2.2
0.1
-
2.4
0.3
2.5
V
V
V
VRST
CH5 Pre-OSC change to Main-
OSC threshold
VTH
-
1.8
-
V
Pre-OSC frequency(CH6)
fPre-OSC
320
400
450 KHz
Soft start block [CS]
μA
Charge current
ICS
-3.0
-2.5
-2.0
Short circuit detection block [SCP]
Threshold voltage
VTH
VSTB
VI
0.65
0.70
50
0.75
100
100
-0.6
V
Input standby voltage
Input latch voltage
-
-
mV
mV
μA
50
Input source current
ICSCP
-1.4
-1.0
Triangular wave oscillator block [OSC]
Oscillator frequency
fOSC CT=75pF
450
-
500
1
550
10
kHz
%
△f
Frequency stability for voltage
VCC=2.5V to 7V
/fdv
△f
Frequency stability for
temperature
T =-30℃ to 85℃
A
-
1
20
-
%
%
/fdt
DUTY
CH5 Maximum Duty
80
90
Error amplifier block [Error Amp](CH1~CH5)
Threshold voltage VREF FB=1.22V
1.20
1.22
1.24
V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
T
A
= -30℃ to 85℃
△VT/VT
VT temperature stability
-
0.5
-
%
Input bias current
Voltage gain
IB
IN=0V
DC
-320
-
-80
-
-
nA
dB
AV
100
Frequency bandwidth
BW AV=0dB
VOH
VOL
-
1.3
-
10
1.5
20
-
MHz
V
mV
-
Output voltage
200
Output source current
Output sink current
ISOURCE FB=0.5V
-
-2.0
-1.0
mA
μA
ISINK FB=0.5V
70
120
-
Short detect comparator [SCP Comp]
VTH
Threshold voltage
CH1 to CH4
CH5
0.9
0.8
1.0
0.9
-80
1.1
1.0
-
V
V
VTH
Threshold voltage
Input bias current
IB
IN=0V
-320
nA
PWM Comp. [PWM Comp]
VT0
Duty = 0 %
0.25
-
0.3
0.80
-0.3
-
0.85
-
V
V
Threshold voltage(CH1~6)
Input current
VTmax Duty = 100 %
IDTC DTC=0.5V
μA
-1.0
Output block (CH1 to CH4) [Pin 40,42,46,47]
Output source current
Output sink current
ISOURCE OUT=VCC/2
-
65
-
-130
100
18
-80
-
mA
mA
Ω
ISINK OUT=VCC/2
ROH OUT = -15mA
ROL OUT = 15mA
30
25
Output ON resistor
Ω
-
16
Output block (CH1,2 ) [Pin 41,43]
Output source current
ISOURCE OUT=VCC/2
ISINK OUT=VCC/2
ROH OUT = -15mA
ROL OUT = 15mA
-
65
-
-130
100
18
-80
-
mA
mA
Ω
Output sink current
30
25
Output ON resistor
Ω
-
16
Output block (CH5) [Pin 48]
Output source current
Output sink current
ISOURCE Duty=90%, OUT=VCC/2
-
150
-
-260
260
9
-160
-
mA
mA
Ω
Duty≦5%, OUT=VCC/2
ISINK
ROH OUT = -15mA
ROL OUT = 15mA
15
15
Output ON resistor
Control block [CTL]
CTL input voltage
Ω
-
9
VIH
VIL
Active mode
1.3
0
-
-
7
V
V
Standby mode
0.8
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
VIH
VIL
Active mode
1.3
0
-
-
7
V
V
CTL1 to CTL5 input voltage
Standby mode
0.8
20
μA
Input current
ICTL CTL = 5V
-
5
SEL block [CTL]
VIH
VIL
N-CH Drive
P-CH Drive
VCC/2
0
-
-
7
V
V
SEL1 to SEL4 input voltage
0.8
Low battery detect block [LBI, LBO]
LBI detect threshold
1.20
1.22
1.24
+50
0.4
1
V
mV
V
Detect Hysteresis
-50
LBO output voltage low
LBO output high leakage
General
Isink=1mA
-
-
-
V
=5V
μA
0.01
LBO
CTL=CTL1=CTL2=CTL
3=CTL4=CTL5=0V
μA
μA
mA
Icss
-
-
-
1
200
3
10
250
7
Standby current
CTL=0V,
Icss(o) CTL1=CTL2=CTL3=CT
L4= CTL5="H"
CTL=CTL1=CTL2=CTL
Power supply current
Icc
3=CTL4=CTL5="H"
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Function Description
1. Power Converter Functions
＊Reference voltage block
The reference voltage circuit generates a temperature independence voltage
(typical=2.2V) from the power source, which is used as reference voltage for the
IC’s internal circuitry and supply load current above 10mA to external device.
＊Triangular oscillator block
The triangular wave oscillator is generated by timing capacitor(CT) to incorporate
each other. The waveforms CT (amplitude of 0.3V to 0.8V), CT1 (amplitude
0.3V to 0.8V in phase with CT) and CT2 (amplitude 0.3V to 0.8V in inverse phase
with CT) are input to the PWM comparator.
＊Error amplifier block
The error amplifier outputs controlling error signal to PWM comparator from
sensing DC/DC converter output voltage. In addition, an arbitrary loop gain can
be set by connecting feedback resistor and capacitor from the output pin to
inverted input pin of the error amplifier, in order to make a stable system.
＊CH4 Inverting amplifier block
The inverting amplifier detects the DC/DC converter output voltage (negative)
and outputs a control signal to the error amplifier.
＊PWM comparator block
The PWM comparator is a voltage-to-pulse width converter for controlling the
duty cycle of DC/DC converter.
Channels 1, 2 main sides, channel 3, 4, and 5: The comparator keeps the
output transistor turn on while the error amplifier output voltage and DTC voltage
still higher than the triangular wave voltage.
Channels 1, 2 synchronous rectification sides : The comparator keeps the output
transistor turn on while the error amplifier output voltage still lower than the
triangular wave voltage.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
＊Output block
The output block is the totem pole configuration, which could drive external
MOSFET or transistor. It can be drive the external N-MOSFET by force the SEL
to High, and it can be drive the external P-MOSFET by force the SEL to LOW.
2. Channel Control Function
The channels are turned on and turned off depending on the voltage levels at the
CTL, CTL12, CTL3, CTL4, CTL5, and CTL6. Described as follow.
CTL
CTL1
CTL2
CTL3
CTL4
CTL5
CH1
L
X
H
Z
H
Z
Z
H
Z
Z
Z
Z
X
Z
X
Z
Z
H
Z
Z
X
Z
Z
ON
OFF
OFF
OFF
OFF
Z
Z
OFF
ON
OFF
OFF
OFF
Z
H
Z
OFF
OFF
OFF
ON
OFF
Z
H
OFF
OFF
OFF
OFF
ON
X
Z
OFF
OFF
OFF
ON
OFF
OFF
CH2
CH3
CH4
CH5
X : Don’t care
Z: Low or Floating
3. Protective Functions
＊Short circuit protection and timer latch
The short circuit detection comparator in each channel detects the output voltage
level of power converter. When the output voltage falls below the short
detection level, there is a constant current bias charging the external capacitor
CCSCP which connected to the CSCP pin until the capacitor voltage level reaches
about 0.7V then disable the IC. It could reset the actuated protection by restart
the power source or pull CTL from low to high.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
＊Under-voltage lockout protection
The under-voltage lockout protection is to disable the IC while the supply voltage
transient or momentary decrease, which may cause the IC to malfunction. To
prevent such malfunctions, the under-voltage lockout protection circuit detects a
decrease in internal reference voltage with respect to the power supply voltage,
turns off the output transistor, and holding the CSCP pin at the “L” level.
＊Battery Low Detect Function
The Battery low comparator open-drain output LBO sinks up to 1mA if the LBI
input is below its threshold voltage. Connect LBO to power source with a
100KΩ~1MΩ pull-up resistor.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
4. Soft Start Operation
＊After CTL ON, driving the CTL1, CTL2, CTL3, CTL4 and CTL5 to high level.
The driving scheme is described as follow diagram.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
14
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
＊Soft start setting (CH1~5)
Consider the input voltage and load current to design the capacitor connected to
the SS pin.
It can calculate the CH1~5 soft start time Ts(s).
∆V
∆t
C ×
= I
Ts(s) = 0.2 × C(µF)
Note : It could be disabled soft start function by floating SS pin.
Determine the triangular Oscillator Frequency
The triangular oscillator frequency is determined by the timing capacitor (CT). It is
difficult to incorporate these non-linear characteristics into the equation. This
difference is caused by characteristics, such as changes in the maximum voltage
amplitude of the sawtooth waveform with the CT value and the circuit delay causing
the maximum amplitude to become large in the case of a high oscillating frequency
even for the same capacitor. In practical use, therefore, the user should read the CT
values from the characteristic curve or should determine an approximate target value
by using the equation.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
15
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Design the DC/DC Output Voltage
＊CH1~5
Setting Time Period When Short Circuit Protection
The CSCP comparator detects each channel output voltage while the power
converter work at normal condition. At the same time, the voltage level of CSCP
pin is held at low level. If the output load of these converters rapidly
malfunction or short, causing the output voltage to drop, the CSCP comparator
detects that to enable short circuit protection. The time period when short circuit
protection show as follow equation.
Short detection time (TPE(s))
TPE(s) = 0.7 * CCSCP (μF)
Note : It could be disabled short circuit protection function by connecting CSCP
pin into the ground.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
16
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Setting the Dead Time Control Level
When using Boost, SEPIC, Zeta or flyback DC/DC converter, it must prevent that
output transistor works at full-ON state (ON duty = 100%). To prevent this
situation, set the maximum duty of these channels. The dead time control circuit
is implemented as below. When the voltage at the DTC pin is higher than the
triangular wave voltage (CT, CT1, CT2), the output transistor is turned on. The
maximum duty calculation formula assuming that triangular wave amplitude =
0.5V and triangular wave minimum voltage = 0.3V.
Vd − 0.3
DutyMAX . = (
) ×100%
0.5
Note 1 : The circuit is suitable at CH1 to CH6.
Note 2 : Shorting DTC and VREG to disable dead time control function.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
17
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Package Outline
LQFP48
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
18
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