Rohm BD8627EFV Fet controller type 3ch system power supply ic Datasheet

System Power Supply for TV Series
FET Controller Type
3ch System Power Supply ICs
No.09034EAT05
BD8627EFV
●Description
BD8627EFV has 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) High efficiency in all load area
2) 3.0A output current
3) Low RDS(ON) internal switches (PchMOS:85mΩ, NchMOS:65mΩ)
4) ±1% reference voltage accuracy
5) Programmable frequency : 250kHz-1MHz
6) Terminal RT OPEN/SHORT detecting function
7) Over current protection function
8) Output over voltage/low voltage protection function (over : FB > VREF +60mV , low : FB < VREF -60mV)
9) Timer off latch function in abnormal circumstances
10) Thermal shutdown function
11) Under voltage protection
12) Soft start/start delay circuit
13) Soft start time out function
14) HTSSOP-B20 package
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1/12
2009.05 - Rev.A
Technical Note
BD8627EFV
●ABSOLUTE MAXIMUM RATING (Ta=25℃)
Parameter
Input supply voltage
Input terminal voltage
Output terminal voltage
Output current
Power dissipation
Operating temperature
Storage temperature
Symbol
VIN
VINP*1
VOUT*2
IOUT
Pd
Topr
Tstg
Limits
7
VIN
VIN
4
3.2*3
-10 ~ 85
-55 ~ 150
Unit
V
V
V
A
W
℃
℃
*1 VINP Application terminal: EN, SS/DELAY, TEST, FB
*2 VOUT Application terminal: SW, PDET, FC, RT, REG
*3 (70mm x 70mm, thickness 1.6mm, and four layer glass epoxy substrates)
When mounting substrate and the package back exposure part are connected with solder.
Operating at higher than Ta=25℃, 25.6mW shall be reduced per 1
Parameter
Input supply voltage
Output current
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Operation condition
Symbol
MIN
VIN
4.5
IOUT
-
2/12
TYP
-
MAX
6.0
3.0
Unit
V
A
2009.05 - Rev.A
Technical Note
BD8627EFV
● Electrical characteristic
(Unless otherwise noted Ta=25℃, VIN=5.6V)
Specification value
UNIT
Condition
MIN
TYP
MAX
VIN supply current (operating)
IQ_active
1.3
2.0
mA
VFB = 0.83V, VFC = 1V
VEN = 0V
μA
VIN supply current (standby)
IQ_stby
350
700
Reference voltage (VREF)
VREF
0.792
0.8
0.808
V
Output rise detection voltage
VOVP
30
60
90
mV
Monitoring FB terminal
Output decrease detection voltage
VLVP
-90
-60
-30
mV
Monitoring FB terminal
Terminal PDET output current
IPDET
1
mA
VPDET< 0.5V
ROSC = 220kΩ
Oscillation frequency
fOSC
500
550
600
kHz
Pch FET ON resistance
RPFET
85
120
mΩ
ISW = 1A
Nch FET ON resistance
RNFET
65
100
mΩ
ISW = -1A
UVLO voltage
VUVLO
3.8
4.0
4.2
V
μA
SW leak current
ILSW
0
1
VEN= 0V, VIN = 6V
EN terminal H threshold voltage
VENH
2.0
V
EN terminal L threshold voltage
VENL
0.5
V
μA
SS/DELAY terminal source current
ISSSO
2
4
6
VFB :FB terminal voltage, VEN :EN terminal voltage, VFC :FC terminal voltage, VPDET: PDET terminal voltage
Current capability should not exceed Pd.
Parameter
Symbol
Permissible loss
Permissible loss : PD [W]
4
(70mm×70mm, thickness 1.6mm, and four layer glass epoxy
substrates)
When mounting substrate and the package back exposure part are
connected with solder.
3
2
1
0
0
25
50
75
100
125
150
Surrounding temperature : Ta [℃]
Fig. 1 heat decrease curve
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© 2009 ROHM Co., Ltd. All rights reserved.
3/12
2009.05 - Rev.A
Technical Note
BD8627EFV
12 VIN
11 VIN
SW 9
SW 10
14 VIN
PGND 7
13 VIN
15 REG
VIN
REG
Predrive
en
PWM
CONTROL
REG
PGND 8
SW 5
Shut
Down
SW 4
Detect Abnormal
Voltage
and Start error
Err AMP
FB 2
PDET 3
REG
0.8V
SGND 1
PGND 6
enable
16 EN
17 TEST
18 SS/DELAY
19 FC
OSC
REG
20 RT
● Block Diagram
Fig.2 Block diagram
●Pin description
No.
Symbol
1
SGND
2
FB
3
PDET
4
5
6
7
8
9
10
11
12
13
14
15
16
17
SW
SW
PGND
PGND
PGND
SW
SW
VIN
VIN
VIN
VIN
REG
EN
TEST
18
19
20
Description
Signal GND terminal
Feed back terminal
Explanation
Small signal system GND
Output voltage detection
Off latch signal output
Reset output
Output terminal
Switching output
Power GND terminal
GND for power MOSFET
Output terminal
Power Mos output
Power supply input terminal
Power supply input. The decoupling is done to
PGND
Internal regulator
Enable input
TEST terminal
Soft start adjustment capacity connection
SS/DELAY
terminal
FC
Error amplifier output
Frequency adjustment resistance connection
RT
terminal
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4/12
Internal regulator
ON/OFF control for device operation
GND short in application set
The soft start time is adjusted with the connected
capacitor
Error amplifier phase compensation point
The switching frequency is set by the connected
resistance
2009.05 - Rev.A
Technical Note
BD8627EFV
●Pin equivalence circuit diagram
No.
Symbol
1
SGND
Explanation
Terminal equivalent circuit diagram
GND (connected 0V)
VIN
2
FB
Output voltage detection terminal
2
SGND
3
PDET
4,5,9,10
SW
6,7,8
PGND
11,12,13,14
VIN
Off latch signal output terminal
Output terminal
Power GND
(Same voltage as SGND)
Power supply input terminal
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5/12
2009.05 - Rev.A
Technical Note
BD8627EFV
No.
Symbol
Explanation
Terminal equivalent circuit diagram
VIN
15
REG
VIN
15
Internal regulator output terminal
SGND
VIN
16
EN
VIN
15
Enable terminal
SGND
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6/12
2009.05 - Rev.A
Technical Note
BD8627EFV
No.
Symbol
Explanation
Terminal equivalent circuit diagram
VIN
18
SS
Soft start time adjustment terminal
18
SGND
19
FC
Error amplifier compensation
terminal
RT
Oscillator frequency adjustment
terminal
VIN
20
20
SGND
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7/12
2009.05 - Rev.A
Technical Note
BD8627EFV
● Operation description
Enable control
The device can be controlled ON/OFF by EN terminal (16 pin) voltage.
An internal circuit starts when VEN reaches 0.65V.
VEN
EN terminal voltage
VENTH
0
VSS
VSSCLM
SS terminal voltage
VSSTH
0
VO
Output setting voltage
0
tSS
VPDET
PDET
0
Fig.3 ON/OFF transition wave form in EN controlling
Soft start time set function
As for BD8627EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS
and SGND terminal.
Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.
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8/12
2009.05 - Rev.A
Technical Note
BD8627EFV
OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND
(range = 250kHz - 1MHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.4.
10000
Frequency [kHz]
1000
100
10
10
100
1000
10000
RT terminal resistance [kΩ]
Fig. 4 RT resistance-oscillation frequency
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9/12
2009.05 - Rev.A
Technical Note
BD8627EFV
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection
operation.
Low voltage protection function (LVP)
The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF.
If FB terminal voltage falls below VLVP(= VREF -60mV) and the state continues for 500us, output changes to low voltage and
the state is fixed. In that case , PDET (3pin) output changes to L.
Table 1 output low voltage protection function
Low voltage protection Low voltage protection
EN terminal
SS terminal
FB terminal
function
operation
<VLVP
ON
>1.4V(typ)
Effective
>VIHEN
>VLVP
OFF
<1.4V(typ)
Invalidity
OFF
<VILEN
Invalidity
OFF
* Low voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
Over voltage protection function(OVP)
The voltage of the terminal FB is compared with internal reference voltage VREF.
If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage
and the state is fixed.
EN terminal
>VIHEN
<VILEN
Table 2 output over voltage protection function
Over voltage
SS terminal
FB terminal
protection function
>VOVP
>1.4V(typ)
Effective
<VOVP
<1.4V(typ)
Invalidity
Invalidity
Over voltage
protection operation
ON
OFF
OFF
OFF
* Over voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
VFB
VREF+60mV
FB terminal voltage
VREF
VREF-60mV
0
Protection
PDET terminal
ON
OFF
500[us]
500[us]
OVP
LVP
HIGH
LOW
Fig. 5 Output voltage error detection range
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10/12
2009.05 - Rev.A
Technical Note
BD8627EFV
Under voltage lock out protection (UVLO)
As for BD8627EFV, the power-supply voltage decrease detection protection circuit is built in.
It the input voltage decrease below the UVLO voltage (4.0V typ), the device state changes to the standby mode (Moreover,
to prevent the chattering of the output) hysteresis width of 300mV(typ) has been installed in the UVLO cancel voltage.
RT terminal open/short protection function (RTO/RTS)
RT terminal opening/short protection function prevent the clock from abnormal oscillation.
If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed.
Terminal RT opening/short protection function is always effective after the power supply start-up.
Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates
when the state continues about 500μsec(typ).
Soft start time-out function
If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8627EFV controls an off latch.
Vo is fixed in a low level.
Fig. 6 Soft start time-out
Error detection (off latch) release method
BD8627EFV enters the state of an off latch when the protection function operates.
To release the off latch state, EN terminal voltage should be changed to low level once time.
Thermal shut down function
Thermal shut down circuit (TSD circuit) is built into BD8627EFV. When the temperature of the chip exceeds Tjmax=175, the
DC/DC converter is fixed in a low voltage.
TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175.
It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set.
Over current protection function
The over current protection function has been achieved by limiting the current that flows on high side MOSFET.
The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about
500μsec(typ), the output is fixed in a low level.
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11/12
2009.05 - Rev.A
Technical Note
BD8627EFV
●Ordering part number
B
D
8
Part No
6
2
7
E
Part No.
F
V
-
Package
EFV: HTSSOP-B24
E
2
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B20
<Dimension>
<Tape and Reel information>
6.5 ± 0.1
11
6.4 ± 0.2
4.4 ± 0.1
0.5 ± 0.15
1.0 ± 0.2
20
1
10
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
(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)
0.17 +0.05
−0.03
S
0.08 S
1234
1234
1234
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1pin
1234
(Unit:mm)
1234
Reel
1234
0.2 +0.05
−0.04
1234
0.65
1234
1.0Max.
0.85 ± 0.05
0.08 ± 0.05
0.325
Tape
Direction of feed
※When you order , please order in times the amount of package quantity.
12/12
2009.05 - Rev.A
Notice
Notes
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"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.
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However, should you incur any damage arising from any inaccuracy or misprint of such
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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
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