BD8628EFV-E2 [ROHM]
FET Controller Type 3ch System Power Supply ICs; FET控制器类型3通道系统电源IC型号: | BD8628EFV-E2 |
厂家: | ROHM |
描述: | FET Controller Type 3ch System Power Supply ICs |
文件: | 总15页 (文件大小:394K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
System Power Supply for TV Series
FET Controller Type
3ch System Power Supply ICs
BD8628EFV, BD8624EFV
No.09034EAT06
●Description
BD8628EFV / BD8624EFV have realized the high performance and reliability required as a power supply for thin-screen
TV.
With built-in FET 1ch current mode control, the DC/DC Converter series has the advantage of high-speed load response
and wide phase margin.
Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and
due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application
design.
As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal
protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not
easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for
thin-screen TV which requires the high reliability.
●Features
1) 11ch synchronous rectification step-down system DC/DC converter
2) Soft start, soft off function
3) Built-in low voltage / overvoltage protection function
4) Built-in overcurrent protection function
5) Frequency setting by external resistance is available. (RT terminal)
6) Protection time setting by external resistance is available. (RSET terminal)
7) Built-in RT / RSET terminal open/short protection function
8) Protection control with built-in sequencer
9) Built-in adjustment function time of off latch
10) Built-in error state detection signal output function
11) Built-in tracking function
12) Corresponded to protecting bus
13) Load current Maximum 3A
14) HTSSOP-B24 Package
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
1/14
Technical Note
BD8628EFV, BD8624EFV
●Electric characteristic
(Ta=25℃, VCC=6.5V, GND=0V,CTL=6.5V unless otherwise specified.)
specification value
Parameter
Symbol
UNIT
Condition
MIN
TYP
0
MAX
Circuit current 1
Circuit current 2
IQ1
IQ2
-
-
10
-
μA
mA
CTL=0V
3.4
CTL=VCC
< Error amplifier part >
Terminal FB and FC
terminal short
VFB=0.9V
VFB=0.7V
VFB=0.9V
Standard voltage (VREF)
VREF
0.792
0.8
0
-
-
-
-
0.808
V
Terminal FB Input bias current
Terminal FC Clamping voltage H
Terminal FC Clamping voltage L
Terminal FC Sink current
Terminal FC Source current
Open loop gain
IFBB
VFCH
VFCL
IFCSINK
IFCSOURCE
AVERR
-1
1.8
-
0.5
-
1
-
0.2
-
-70
-
μA
V
V
mA
μA
dB
VFB=0.9V, VFC=0.4V
VFB=0.7V, VFC=1.6V
-
100
<OSC part>
When terminal RT 27kΩ is
connected
Oscillation frequency
FOSC
400
500
600
kHz
<Soft start >
Charging current
ISS
-3
0.98
2.2
0.1
49
-2.5
1.08
2.4
0.15
70
-2
1.18
-
-
91
μA
V
V
V
kΩ
V
SS=1.0V
Terminal SS Threshold voltage
Terminal SS Clamping voltage
Terminal SS Standby voltage
Terminal SS Discharge resistance
Terminal SS Protection circuit start
voltage
VSSTH
VSSCLM
VSSSTB
RSS
VSS Voltage
VSS Voltage (L to H)
CTL=0V
VSSPON
1.0
1.1
1.2
V
VSS Voltage (L to H)
Terminal SS Protection circuit start
voltage
VSSPON_HYS
10
100
200
mV
VSS Voltage
Maximum hysteresis error
< Low voltage, over voltage detection part>
Terminal FB Low voltage detection
voltage
Terminal FB Overvoltage detection
voltage
< Over current detection part>
Output current limitation threshold
<Power MOS>
VLVP
VOVP
Ilmt
0.51
0.86
0.56
0.96
0.61
1.06
V
V
VFB Voltage
VFB Voltage
VCC-0.9 VCC-0.7 VCC-0.5
V
VSW Voltage
Upper side MOS ON resistance
Lower side MOS ON resistance
RONU
RONL
-
-
110
110
-
-
mΩ
mΩ
VBOOT-VSW =5V
VVREG5=5V
<Others>
Terminal PDET L output voltage
Terminal CTL input voltage H level
voltage
VOL_PDET
VIH_CTL
-
-
-
0.4
V
V
IOL=100uA
2.0
VCC
CTL terminal
Terminal CTL input voltage L level
voltage
VIL_CTL
II_CTL
-
-
-
0.5
90
V
CTL terminal
CTL terminal, CTL=VCC
Terminal CTL input current
60
μA
VFB : FB terminal voltage, VFC : FC terminal voltage, VSS : SS terminal voltage, VMONVCC : MONVCC terminal voltage
Not designed for radiation resistance.
Current capability should not exceed Pd.
www.rohm.com
2009.05 - Rev.A
2/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
Permissible loss
This package is a product of which the feature is the high heat radiation, and connect the back to GND
based on recommended land pattern when you mount.
T j max
cmax
T
Destruction Destruction
temperature temperature
T STGmin
T STGmax
T a min
T a max
jc
ja
θ
θ
[
/W]
[
/W]
℃
[
]
[
]
[
]
[
℃
]
℃
℃
℃
℃
[
]
[
]
℃
℃
19.0
31.3
-50.0
150.0
-45.0
85.0
150.0
150.0
5
4
3
2
1
0
ROHM standard
substrate mounting
θja=31.3℃/W
0
25
50
75
100
125
150
Ambient temperature : Ta [℃]
ROHM standard substrate specification
Material 4 layer glass epoxy substrate(back copper foil70mm x 70mm)
Size 70mm x 70mm x 1.6mmt(Sarmalbiaing is in the substrate.)
Figure.1 Heat decrease curve
※These values are the actual measurement values, and no guarantee values.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
3/14
Technical Note
BD8628EFV, BD8624EFV
●Block diagram
VREF
RT
RT
SS
FB
OSC
OPEN/SHORT
OSC
OSC
RSET
m t i e
OVP
LVP
PDET
PIO
FC
PROTECT
BUS
I/F
SEQ
Control
GND
VREG5
CTL
VCC
CTL
VREG5
BOOT
SW
Driver
Control
PVCC
PVCC
TEST2
TEST1
N.C.
SW
N.C.
N.C.
PGND
PGND
N.C.
Figure.2 Block diagram, Application diagram
●Terminal explan ation
Table 1 Terminal explanation
No.
1
Symbol
Description
No.
13
14
15
16
Symbol
Description
Frequency adjustment resistance
connection terminal
Off latch effective time adjustment
resistance terminal
PGND Power GND terminal
PGND Power GND terminal
RT
2
RSET
PDET
PIO
No wire connection.
N.C.
3
Error state notification terminal
(Connect to GND. )
No wire connection.
(Connect to GND. )
Error state notification
and external IC error detection terminal
4
N.C
5
6
SW
SW
SW terminal
SW terminal
17
18
CTL
Enable input
VCC
VCC power supply terminal
High side Power MOS gate drive
power source terminal
Internal power supply (5.0V) output
terminal
7
8
BOOT
19
20
PVCC
PVCC
Power VCC terminal
Power VCC terminal
VREG5
9
GND
FC
GND
21
22
TEST2 Test terminal (Connect to GND. )
TEST1 Test terminal (Connect to GND. )
10
Phase amends terminal
No wire connection.
(Connect to GND. )
No wire connection.
(Connect to GND. )
11
12
FB
SS
Feedback terminal
23
24
N.C.
Soft start adjustment capacity
connection terminal
N.C.
※Please give to VCC+0.3V as an operation condition in all input terminals except the terminal BOOT.
However, please do not exceed the absolute maximum rating as VCC=PVCC.
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2009.05 - Rev.A
4/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
●Terminal equivalent circuit chart
Terminal
No.
Terminal
name
Explanation
Power GND
Terminal equivalent circuit chart
1
2
PGND
PGND
(The same potential as the GND
terminal)
Power GND
(The same potential as the GND
terminal)
PVCC
PVCC
5
6
SW
SW
SW terminal
SW terminal
⑤
⑥
PGND
VREG5
High side Power MOS gate drive
power source terminal
⑦
7
BOOT
PGND
Internal power supply (5.0V) output
terminal
8
9
VREG5
GND
GND
10
FC
Phase amends terminal
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2009.05 - Rev.A
5/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
Terminal
No.
Terminal
name
Explanation
Terminal equivalent circuit chart
VCC
VCC
11
FB
Voltage detection terminal
⑪
GND
Soft start adjustment capacity
connection terminal
12
SS
Frequency adjustment resistance
connection terminal
13
14
RT
Off latch effective time adjustment
resistance terminal
RSET
15
PDET
Error state notification terminal
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2009.05 - Rev.A
6/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
Terminal
No.
Terminal
name
Explanation
Terminal equivalent circuit chart
Error state notification and external
IC error detection terminal
16
PIO
17
21
22
CTL
Enable input
TEST2
TEST1
Test terminal (Connect to GND. )
Test terminal (Connect to GND. )
19
20
PVCC
PVCC
Power VCC terminal
Power VCC terminal
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2009.05 - Rev.A
7/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
●Operation description
ON/OFF control
DC/DC converter ON/OFF function
DC/DC converter controller can be controlled ON/OFF by CTL terminal.
Analog circuit starts operation at ON control (on mode), and goes down to setting output voltage.
Analog circuit should be standby at OFF control (off mode), and output voltage becomes 0V.
Table2 DC/DC converter ON/OFF function
CTL terminal voltage
>VIHCTL
<VILCTL
ON control
OFF control
Soft start time set function
DC/DC converter can do soft start without overshoot by charging soft start capacity (Css) connected between SS terminal
and GND by charging current at ON control.
The mute of the output is released when it reaches VSS=0.15V (VSSSTB), and the output voltage does the soft start
operation from the point of VSS=0.3V (typ) in proportion to the voltage of the terminal SS.
Also, soft start time (tss) can be set by setting soft start capacity arbitrarily.
Soft start time (tss) should be set at 3msec < tss < 30msec.
※Please note that the overshoot is not caused in the output setting voltage when setting it to tss≦3msec.
VSSTH CSS
tSS
ISS
Discharge function
DC/DC converter can do soft off by discharging load discharged to soft start capacity connected between SS terminal to
GND by discharging resistance at OFF control.
Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ).
Figure.3 Wave form at ON/OFF control
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2009.05 - Rev.A
8/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
OSC oscillation frequency setting function
SW output oscillation frequency of DC/DC converter can be set by installing resistance between RT terminal and GND
externally.
10000
1000
100
10
1
10
100
1000
*Reference date
RT
resistance[KΩ]
terminal
Figure.4 Terminal RT resistance-oscillation frequency
Range of terminal RT connection resistance setting
23kΩ≦Rrt≦135kΩ
(100kHz≦fosc≦600kHz)
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2009.05 - Rev.A
9/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
PROTECT BUS Input/output function
The terminal PIO is PROTECT BUS Input/output terminal. The terminal PIO is Hi-Z when DC/DC usually operates. When the
terminal PIO becomes LOW by connecting PROTECT BUS, DC/DC is turned off. Afterwards, when the terminal PIO
becomes HIGH, it reactivates.
DC/DC is Off latch when DC/DC error detects it and the terminal PDET becomes LOW.
Table3 PIO terminal, PDET terminal output function
DC/DC
PIO terminal
PDET terminal
DC/DC
Error detection
Undetection
Undetection
Detection
Hi-Z
LOW
LOW
Hi-Z
Hi-Z
LOW
ON
OFF
Off latch
PROTECT BUS Timing chart
If two or more BD8628EFV//BD8624FV is connected in PROTECT BUS, and it uses at the same time,
when one IC error detects, all remaining IC becomes PIO = Low at the same time, and the output is turned off.
Protecting BUS part timing chart
IC_A detects error.
OFF LATCH
High
High
IC_A
PDET
PIO
LOW
LOW
IC_A
PIO
IC_A
PIO
High
IC_B
PIO
LOW
IC_B
IC_B
Vo
DC/DC OFF
0V
High
IC_B
PDET
When two or more BD8628EFV/BD8624FV is used at the same time,
If one IC error detects, all IC becomes DC/DC OFF at the same time.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
10/14
Technical Note
BD8628EFV, BD8624EFV
●Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operation.
Low voltage protection function(LVP)
Low voltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter compared
to internal reference level.
Low voltage protection function operates when FB terminal voltage falls below VLVP (=0.7 x VREF) and continues more than
set time in external resistance.
Table 4 Low voltage protection function
CTL
terminal
Low voltage
protection function
Low voltage
protection operation
SS terminal
>1.1V(typ)
FB terminal
<VLVP
>VLVP+VLVP_HYS
ON
Enable
>VIHCTL
OFF
OFF
OFF
<1.0V(typ)
-
-
-
Disable
Disable
<VILCTL
※Constant voltage protection function is enabled when SS terminal voltage becomes more than 1.1V (typ) in the
transition to ON control (during soft start).
Overvoltage protection function (OVP)
Overvoltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter controller
compared to internal reference level.
Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.2 x VREF) and continues more than
set time in external resistance.
Table 5 Overvoltage protection function
CTL
terminal
Overvoltage protection Overvoltage protection
SS terminal
>1.1V(typ)
FB terminal
function
operation
>VOVP
<VOVP
ON
OFF
Enable
>VIHCTL
<VILCTL
<1.0V(typ)
-
-
-
Disable
Disable
OFF
OFF
※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in
the transition to ON control (during soft start).
VFB
1.2×VREF
FB
VREF
terminal voltage
0.7×VREF+VLVP_HYS
0.7×VREF
0
ON
Protection
OFF
LVP
OVP
LVP
Hi-Z
PDET
terminal
LOW
Figure.5 Low voltage / overvoltage protection
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2009.05 - Rev.A
11/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
Overcurrent protection function (OCP)
Overcurrent protection function compared drain voltage (LX terminal voltage) with internal OCP terminal voltage when
internal Nch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS
would be OFF.
Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and
continues more than set time in external resistance.
Table 6 overcurrent protection function
CTL
terminal
Overcurrent
protection function
Overcurrent
protection operation
SS terminal
>1.1V(typ)
Output current
>Ilmt
<Ilmt
-
-
ON
Enable
>VIHCTL
<VILCTL
OFF
OFF
OFF
<1.0V(typ)
-
Disable
Disable
LX terminal voltage
OCP
terminal
voltage
Immediately
off.
Immediately
off.
Immediately
off.
DRVA
DRVB
Output
current
To an off latch in continuance
of set time (typ) in external
resistance
Output current
Set time in
external
resistance
Rocp
LX
ON
Protection
OFF
OCP
Off operation immediately
Off latch
Figure.6 Overcurrent protection
RT terminal open/short protection function
RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short condition
internally from RT terminal to prevent from output voltage error caused by error oscillation of internal triangular wave at RT
terminal open/short.
RT terminal open/short protection function is regularly enabled after boot-up.
RT terminal open/short protection function operates when error detection condition continues more than set time in external
resistance.
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2009.05 - Rev.A
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© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
Soft start time-out function
DC/DC converter off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS after 50msec (typ)
passed from soft start.
VSSCLM
VSSPON
SS terminal
VSSSTB+VSSSTB_HYS
0V
About 50msec(typ)
Figure.7 At soft start time-out
Error detection (off latch) release method
DC/DC converter becomes off latch condition when protection function operates. Off latch can be released by the following
method. DC/DC converter controller of each Ch becomes able to do ON control transition by releasing off latch.
1. Set all Ch CTL terminal voltage as < VILCTL and continue that condition about more than 200usec (typ).
2. Drop down power supply VCC to below 2.7V(TYP).
Error detection time set function
Time from the error detection to the off latch can be set by putting resistance outside between GND and RSET terminal.
tofflatch 1.8103 Rrset [usec]
Rset setting range
10kΩ≦Rset≦75kΩ
(18usec≦tofflach≦135usec)
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2009.05 - Rev.A
13/14
© 2009 ROHM Co., Ltd. All rights reserved.
Technical Note
BD8628EFV, BD8624EFV
●Ordering part number
B
D
8
6
2
8
E
F
V
-
E
2
Part No
Part No.
8628
8624
Package
EFV: HTSSOP-B24
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B24
<Dimension>
<Tape and Reel information>
Tape
Embossed carrier tape
Quantity
2000pcs
7.8 0.1
+6
−4
4
Direction
of feed
E2
24
13
(The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand)
+0.05
−0.03
1
12
0.17
0.08
0.325
S
0.65
+0.05
−0.04
0.2
M
0.08
Direction of feed
1pin
Reel
(Unit:mm)
※When you order , please order in times the amount of package quantity.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.A
14/14
Notice
N o t e s
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,
fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of
any of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
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R0039
A
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