ROHM BD8601FV

TECHNICAL NOTE
System Power Supply for TV Series
FET Controller Type
3ch System Power Supply ICs
BD8601FV
●Description
BD8601FV has realized the high performance and reliability required as a power supply for thin-screen TV.
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) 3ch synchronous rectification step-down system DC/DC converter controller
2) 3ch independent ON/OFF. controllable
3) Soft start, soft off function
4) Concentrated protection control with built-in sequencer
5) Built-in low voltage protection function
6) Built-in overvoltage protection function
7) Built-in overcurrent protection function
8) Built-in RT terminal open/short protection function
9) Built-in duty clamp (90% ON) function
10) Frequency setting by external resistance is available.
11) Protection condition is output from PDET terminal.
12) Built-in external reset output function
Aug. 2008
● Electric characteristic
(Ta=25℃, VIN1, VIN2, VIN3=5.0V, VCC=5.0V, and GND=0V unless otherwise specified.)
Parameter
Symbol
specification value
MIN
TYP
MAX
UNIT
Condition
IQ1
IQ2
-
3.5
7
8
15
mA
mA
CTL1,2,3=0V
CTL1,2,3=VCC
VREF
IFBB
VFCH
VFCL
0.8
100
0.808
1
0.2
-70
-
V
μA
V
V
mA
μA
dB
Terminal FB and FC terminal short
IFCSINK
IFCSOURCE
AVERR
0.792
-1
1.8
0.5
-
FOSC
100
-
600
kHz
FONDUTY
70
85
95
%
VFB=0.7V
ISS
VSSTH
VSSCLM
VSSSTB
-4.0
1.0
1.6
0.11
-2.5
1.1
1.9
0.15
-1.0
1.2
2.2
0.19
μA
V
V
V
VSS=1.0V
VSS voltage, VFC=0.8V
VSSSTB_HYS
5
50
100
mV
RSS
VSSPON
49
1.0
70
1.1
91
1.2
kΩ
V
VSS voltage (L→H)
VSSPON_HYS
10
100
200
mV
VSS voltage
< Low voltage, over voltage detection part Ch1,Ch2,Ch3>
Terminal FB Low voltage detection voltage
VLVP
0.27
0.32
0.37
V
VFB voltage
Circuit current 1
Circuit current 2
< Error amplifier part Ch1,Ch2,Ch3>
Standard voltage (VREF)
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
VFB=0.9V
VFB=0.7V
VFB=0.9V
VFB=0.9V, VFC=0.4V
VFB=0.7V, VFC=1.6V
<OSC part >
Oscillation frequency
< Duty clamping part Ch1,Ch2,Ch3>
Max ON duty ratio
< Soft start part Ch1,Ch2,Ch3>
Charging current
Terminal SS Threshold voltage
Terminal SS Clamping voltage
Terminal SS Standby voltage
Terminal SS Standby voltage
Maximum hysteresis error
Terminal SS Discharge resistance
Terminal SS Protection circuit start voltage
Terminal SS Protection circuit start voltage
Maximum hysteresis error
Terminal FB Low voltage detection
Maximum hysteresis error
Terminal FB Overvoltage detection voltage
VLVP_HYS
VSS voltage (L→H)
10
100
200
mV
VFB voltage
1.08
1.2
1.32
V
VFB voltage
VOVP
< Over current detection part Ch1,Ch2,Ch3>
Terminal LX input bias current
ILXB
Terminal OCP input bias current
IOCPB
< Reset detection part >
Terminal MONVCC reset detection voltage
VRSTO
Terminal MONVCC input bias current
IMONVCCB
Terminal RSTDLY charging current
IRSTDLY
Terminal RESET L output voltage
VOL RST
< Others>
Terminal PDET L output voltage
VOL RDET
Terminal CTL input voltage H level voltage
VIH CTL
Terminal CTL input voltage L level voltage
VIL CTL
Terminal CTL input current
II CTL
-1
20
0
50
1
80
uA
uA
0.98
-1
-15
-
1.0
-10
-
1.02
1
-5
0.4
V
uA
uA
V
VMONVCC voltage (H→L)
2.0
-
85
0.4
VCC
0.5
120
V
V
V
uA
IOL=100uA
VOH_DRV
8.5
-
-
V
Terminal DRV H output voltage
Terminal DRV L output voltage
VOL_DRV
-
-
0.5
V
IOL=100uA
Terminal CTL1,2,3
Terminal CTL1,2,3
Terminal CTL1,2,3, CTL=VCC
Terminal
DRV1A,2A,3A,1B,2B,3B
Terminal
DRV1A,2A,3A,1B,2B,3B
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.
2 / 15
● Block diagram
21
PGND3
22
DRV3B
23
LX3
24
DRV3A
25
VIN3
26
OCP3
27
FB3
12
28
FC3
29
SS3
30
RT
31
GND
32
TEST1
33
TEST2
34
CTL1
35
CTL2
36
CTL3
37
VCC
38
RESET
RSTDLY
39
MONVCC
PDET
40
VRSTO
OVP1.5
LVP0.4
VREF
Delay
Driver
Control
SYSTEM CONTROL SEQUENCER
SS1 SS2 SS3
Driver
Control
Driver
Control
VREF
OVP1.5
LVP0.4
OVP1.5
LVP0.4
VREF
OSC
20
PGND2
19
DRV2B
18
LX2
17
DRV2A
16
VIN2
15
OCP2
14
FB2
13
FC2
11
SS2
10
GND
9
SS1
8
FC1
7
FB1
6
OCP1
5
VIN1
4
DRV1A
3
LX1
2
DRV1B
PGND1
1
Figure 1 block char
● Terminal explanation
No. Symbol
Description
Table 1 terminal explanation
No. Symbol
Ch1 power GND
1 PGND1 (same potential as GND terminal)
2 DRV1B Ch1 Nch drive output terminal
3
LX1 Ch1 overcurrent detection terminal
4 DRV1A Ch1 Pch drive output terminal
5 VIN1 Ch1 power supply input terminal
Ch1 overcurrent detection level
6 OCP1 resistance connection terminal
7 FB1 Ch1 voltage detection terminal
8 FC1 Ch1 phase compensation terminal
Ch1 soft start adjustment capacity
9 SS1 connection terminal
10 GND GND (0V connection)
Frequency adjustment resistance
11 RT connection terminal
Ch2 soft start adjustment capacity
12 SS2 connection terminal
13 FC2 Ch2 phase compensation terminal
14 FB2 Ch2 voltage detection terminal
Ch2 overcurrent detection level resistance
15 OCP2 connection terminal
16 VIN2 Ch2 power supply input terminal
17 DRV2A Ch2 Pch drive output terminal
18 LX2 Ch2 overcurrent detection terminal
19 DRV2B Ch2 Nch drive output terminal
Ch2 power GND
20 PGND2 (same potential as terminal GND)
40
PDET
Description
Off latch signal output
39 MONVCC VCC monitor terminal
Reset delay adjustment capacity
38 RSTDLY connection terminal
37 RESET Reset output terminal
36
VCC Power supply input terminal
35
CTL3
Ch3 control terminal
34
33
CTL2
CTL1
Ch2 control terminal
Ch1 control terminal
32
TEST2 Test terminal (connect to GND)
31
TEST1 Test terminal (Connect to GND)
30
29
28
27
26
25
24
23
22
21
3 / 15
GND
GND (0V connection)
Ch3 soft start adjustment capacity
connection terminal
FC3 Ch3 phase compensation terminal
FB3 Ch3 voltage detection terminal
Ch3 overcurrent detection level resistance
OCP3 connection terminal
VIN3 Ch3 power supply input terminal
DRV3A Ch3 Pch drive output terminal
Ch3 overcurrent detection terminal
LX3
DRV3B Ch3 Nch drive output terminal
Ch3 power GND
PGND3 (same potential as terminal GND)
SS3
● Terminal equivalent circuit chart
Terminal
No.
Terminal
name
1
PGND1
Ch1 Power GND
(GND Terminal and this potential)
20
PGND2
Ch2 Power GND
(GND Terminal and this potential)
21
PGND3
Ch3 Power GND
(GND Terminal and this potential)
2
DRV1B
Ch1 Nch Driving output terminal
19
DRV2B
Ch2 Nch Driving output terminal
22
DRV3B
Ch3 Nch Driving output terminal
Explanation
Terminal equivalent circuit chart
VIN
VIN
②
⑲
22
PGND
PGND
VIN
3
LX1
Ch1
VIN
Over current detection terminal
VIN
18
LX2
Ch2
Over current detection terminal
③
⑱
23
23
LX3
Ch3
Over current detection terminal
PGND
VIN1
4
DRV1A
Ch1 Pch Driving output terminal
17
DRV2A
Ch2 Pch Driving output terminal
VIN1
④
⑰
24
24
DRV3A
Ch3 Pch Driving output terminal
PGND
5
VIN1
Ch1
Power supply input terminal
16
VIN2
Ch2
Power supply input terminal
25
VIN3
Ch3
Power supply input terminal
4 / 15
PGND
Terminal
No.
Terminal
name
Explanation
OCP1
Ch1 Over current detection level
Set resistance connection terminal
Terminal equivalent circuit chart
VCC
6
VIN1
⑥
⑮
15
OCP2
26
Ch2 Over current detection level
Set resistance connection terminal
GND
Ch3 Over current detection level
Set resistance connection terminal
26
OCP3
7
FB1
Ch1
Voltage detection terminal
14
FB2
Ch2
Voltage detection terminal
VCC
⑦
⑭
27
27
FB3
Ch3
Voltage detection terminal
GND
VCC
8
FC1
Ch1
Phase amends terminal
⑧
⑬
28
13
FC2
Ch2
Phase amends terminal
28
FC3
Ch3
Phase amends terminal
GND
5 / 15
Terminal
No..
Terminal
name
9
SS1
Ch1 Soft start
Adjustment capacity connection terminal
12
SS2
Ch2 Soft start
Adjustment capacity connection terminal
29
SS3
Ch3 Soft start
Adjustment capacity connection terminal
10
GND
GND (0V Connection)
30
GND
GND (0V Connection)
Explanation
Terminal equivalent circuit chart
VCC
⑨
⑫
29
GND
VCC
11
RT
Frequency adjustment resistance connection
terminal
⑪
GND
31
TEST1
Test terminal
VCC
32
TEST2
Test terminal
33
CTL1
Ch1 Control terminal
34
CTL2
Ch2 Control terminal
35
CTL3
Ch3 Control terminal
31
32
33
34
35
GND
6 / 15
Terminal
No.
Terminal
name
36
VCC
Explanation
Terminal equivalent circuit chart
Power supply input terminal
VCC
37
RESET
37
Reset output terminal
GND
VCC
38
RSTDLY
Reset Delay
Adjustment capacity connection
terminal
38
GND
VCC
39
MONVCC
39
VCC Monitor terminal
GND
VCC
40
PDET
40
Off latch output terminal
GND
7 / 15
● Operation description
ON/OFF control
DC/DC converter controller ON/OFF function
DC/DC converter controller of each Ch can be independently controlled ON/OFF by CTL1, CTL2, and CTL3 terminal.
Analog circuit of Ch interlocked to each CTL terminal starts operation at ON control (on mode), and goes down to
setting output voltage.
Analog circuit of Ch interlocked to each CTL terminal should be standby at OFF control (off mode), and output voltage
becomes 0V.
Table1 DC/DC converter controller ON/OFF function
CTL1 terminal voltage
Ch1
CTL2 terminal voltage
Ch2
CTL3 terminal voltage
Ch3
>VIHCTL1
ON control
>VIHCTL2
ON control
>VIHCTL3
ON control
<VILCTL1
OFF control
<VILCTL2
OFF control
<VILCTL3
OFF control
Soft start time set function
DC/DC converter controller of each Ch can do soft start without overshoot by charging soft start capacity (Css)
connected between ss terminal and GND in each Ch 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.
t SS 
VSSTH  C SS
I SS
Discharge function
DC/DC converter controller of each Ch 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).
2.0V
CTL terminal voltage
0.5V
1.9V
1.1V
0.8V
SS terminal voltage
0.3V
0.15V
Output voltage
Mute
release
tss
Figure 2 Wave form at ON/OFF control
8 / 15
OSC oscillation frequency setting function
DRVA and DRVB output oscillation frequency of DC/DC converter controller of each Ch can be set by installing
resistance between RT terminal and GND externally.
スイッチング周波数[KHz
Switching
frequency[KHz]
10000
1000
100
10
1
10
100
RT端子抵抗[KΩ]
RT terminal
resistance[KΩ]
1000
*参考データ
*reference
data
Figure 3 Terminal RT resistance-oscillation frequency
Off latch signal output function
PDET terminal outputs condition of off latch when protection operation of DC/DC converter controller of each Ch
operates.
Table 2 PDET terminal off latch signal output function
Protection operation
Terminal PDET
ON
LOW
OFF
Hi-Z
9 / 15
Reset output function
Reset output function observes voltage value from MONVCC terminal and does reset operation compared to internal
reference level.
Set MONVCC terminal external resistance to make VCC voltage more than 5.0V at reset release.
Table 3 DC/DC converter controller ON/OFF function
MONVCC terminal voltage
RESET terminal
LOW
<1.0V(typ)
Hi-Z
>1.072V(typ)
Delay time until detecting reset release is settable by capacitor connected to RSTDLY terminal.
Y
L
D
T Y
S L
R D
C T
S
V R
5 I
3
2
.
1
Y
L
D
T
S
R
T


TRSTDLY:Delay time until detecting reset release
Figure 4 reset operation
10 / 15
● 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 output voltage VO set in each Ch from FB terminal of each Ch and off-latched all
DC/DC converter controller compared to internal reference level.
Low voltage protection function operates when FB terminal voltage falls below VLVP (=1.5 × VREF) and continues about
more than 400μsec (typ).
Table 4 Low voltage protection function
CTL
Low voltage
Low voltage
SS terminal
FB terminal
terminal
protection function
protection operation
>VIHCTL
>1.1V(typ)
<VLVP
ON
Enable
>VLVP+VLVP_HYS
OFF
<1.0V(typ)
Disable
OFF
<VILCTL
Disable
OFF
※Constant voltage 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).
Overvoltage protection function(OVP)
Overvoltage protection function detects output voltage VO set in each Ch from FB terminal of each Ch and off-latched all
DC/DC converter controller compared to internal reference level.
Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.5 × VREF) and continues about
more than 400μsec (typ).
Table 5 Overvoltage protection function
CTL
Overvoltage
Overvoltage
SS terminal
FB terminal
terminal
protection function
protection operation
>VIHCTL
>1.1V(typ)
>VOVP
ON
Effective
<VOVP
OFF
<1.0V(typ)
Invalidity
OFF
<VILCTL
Invalidity
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).
11 / 15
Overcurrent protection function(OCP)
Overcurrent protection function compared drain voltage (LX terminal voltage) with OCP terminal voltage when external
Pch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS would be
OFF. Up to 50uA (typ) of constant current from OCP terminal is synchronized. Overcurrent detection level (OCP terminal
voltage) can be set arbitrarily by external resistance value.
Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and
continues about more than 400μsec (typ).
Table 6 overcurrent protection function
CTL
SS terminal
LX terminal
Overcurrent
terminal
voltage
protection function
>VIHCTL
>1.1V(typ)
<VOCP
Enable
>VOCP
<1.0V(typ)
Disable
<VILCTL
Disable
※Set OCP terminal voltage to be more than VIN-2.5V (typ).
Overcurrent
protection operation
ON
OFF
OFF
OFF
LX terminal Voltage
OCP terminal
Voltage
Immediately
off
Immediately
off
Immediately
off
DRVA
DRVB
Output current
Rocp
LX
Protection
ON
OFF
400usec (typ) to an off latch in
continuance
400usec
OCP
Immediately off operation
Off latch
Figure 5-2. Overcurrent protection
12 / 15
Output current
Terminal FC abnormality protection function
The terminal FC abnormality protection function Ofrattis it all DC/DC converter controller detecting the continuance of the
state that FC which is the difference input of PWMCOMP does not intersect with an internal triangular wave.
The terminal FC abnormality protection function is exceeded 1.95V(typ) by the voltage of the terminal FC or operates
when it falls below 0.62V(typ), and about 400usec(typ) or more continues.
CTL terminal
> VIHCTL
SS terminal
Protection operation
> 1.1V(typ)
Enable
FC terminal
Terminal FC
abnormality protection operation
> 1.95V(typ)
ON
0.62V(typ) < , < 1.95V(typ)
OFF
< 1.0V(typ)
< 0.62V(typ)
ON
Disable
< VIHCTL
OFF
※Terminal FC abnormality 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).
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 abnormal 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 about more
than 400μsec (typ).
13 / 15
Soft start time-out function
Each Ch DC/DC converter controller off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS
after 50msec (typ) passed from soft start.
Figure 5-3. At soft start time-out
Error detection (off latch) release method
Each Ch DC/DC converter controller comes into off latch condition when protection function operates. Off latch can be
released by the following method. Each Ch DC/DC converter controller 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 4.5V.
14 / 15
SSOP-B40
<Dimension>
<Tape and Reel information>
13.6 ± 0.2
21
1
20
2000pcs
Direction
of feed
E2
0.3Min.
(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)
0.15 ± 0.1
1234
(Unit:mm)
1234
1pin
Reel
1234
0.08 M
1234
0.22 ± 0.1
1234
0.65
1234
0.1
1234
0.1
Embossed carrier tape
Quantity
1234
1.8 ± 0.1
7.8 ± 0.3
5.4 ± 0.2
40
Tape
Direction of feed
※When you order , please order in times the amount of package quantity.
15 / 15
Catalog No.08T272A '08.8 ROHM ©
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
ROHM Customer Support System
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Copyright © 2008 ROHM CO.,LTD.
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Appendix1-Rev2.0