System Power Supply for TV Series
FET Controller Type
3ch System Power Supply ICs
No.09034EAT06
BD8628EFV, BD8624EFV
●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.
1/14
2009.05 - Rev.A
Technical Note
BD8628EFV, BD8624EFV
●Electric characteristic
(Ta=25℃, VCC=6.5V, GND=0V,CTL=6.5V unless otherwise specified.)
specification value
Parameter
Symbol
MIN
TYP
MAX
Circuit current 1
IQ1
0
10
Circuit current 2
IQ2
3.4
< Error amplifier part >
UNIT
μA
mA
Standard voltage (VREF)
VREF
0.792
0.8
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
-
0
100
1
0.2
-70
-
μA
V
V
mA
μA
dB
FOSC
400
500
600
kHz
Oscillation frequency
Condition
CTL=0V
CTL=VCC
Terminal FB and FC
terminal short
VFB=0.9V
VFB=0.7V
VFB=0.9V
VFB=0.9V, VFC=0.4V
VFB=0.7V, VFC=1.6V
When terminal RT 27kΩ is
connected
Charging current
ISS
-3
-2.5
-2
μA
VSS=1.0V
Terminal SS Threshold voltage
VSSTH
0.98
1.08
1.18
V
VSS Voltage
Terminal SS Clamping voltage
VSSCLM
2.2
2.4
V
Terminal SS Standby voltage
VSSSTB
0.1
0.15
V
VSS Voltage (L to H)
Terminal SS Discharge resistance
RSS
49
70
91
kΩ
CTL=0V
Terminal SS Protection circuit start
VSSPON
1.0
1.1
1.2
V
VSS Voltage (L to H)
voltage
Terminal SS Protection circuit start
10
100
200
mV
VSS Voltage
voltage
VSSPON_HYS
Maximum hysteresis error
< Low voltage, over voltage detection part>
Terminal FB Low voltage detection
0.51
0.56
0.61
V
VFB Voltage
VLVP
voltage
Terminal FB Overvoltage detection
VOVP
0.86
0.96
1.06
V
VFB Voltage
voltage
< Over current detection part>
Output current limitation threshold
Ilmt
VCC-0.9 VCC-0.7 VCC-0.5
V
VSW Voltage
mΩ
Upper side MOS ON resistance
RONU
110
VBOOT-VSW =5V
Lower side MOS ON resistance
RONL
110
mΩ
VVREG5=5V
Terminal PDET L output voltage
VOL_PDET
0.4
V
IOL=100uA
Terminal CTL input voltage H level
VIH_CTL
2.0
VCC
V
voltage
CTL terminal
Terminal CTL input voltage L level
0.5
V
VIL_CTL
CTL terminal
voltage
Terminal CTL input current
II_CTL
60
90
μA
CTL terminal, CTL=VCC
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.
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© 2009 ROHM Co., Ltd. All rights reserved.
2/14
2009.05 - Rev.A
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
T cmax
θ jc
[ ℃ /W]
19.0
θ ja
[ ℃ /W]
31.3
T STGmin
T STGmax
T a min
T a max
[℃ ]
[℃ ]
[℃ ]
[℃ ]
-50.0
150.0
-45.0
85.0
Destruction
temperature
Destruction
temperature
[℃]
[℃]
150.0
150.0
Permissible loss : Pd [W]
5
4
ROHM standard
substrate mounting
θja=31.3℃/W
3
2
1
0
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.
3/14
2009.05 - Rev.A
Technical Note
BD8628EFV, BD8624EFV
●Block diagram
RT
VREF
RT
OPEN/SHORT
SS
OSC
12
1
3
OSC
OSC
FB
RSET
11
time
1
4
OVP
LVP
PDET
FC
10
1
5
PIO
PROTECT
BUS
I/F
SEQ
Control
GND
9
1
6
VREG5
CTL
VREG5
8
1
7
CTL
BOOT
VCC
7
18
Driver
Control
PVCC
SW
6
19
PVCC
SW
5
20
TEST2
N.C.
4
21
TEST1
N.C.
3
22
PGND
N.C.
2
23
PGND
N.C.
1
24
Figure.2 Block diagram, Application diagram
●Terminal explan ation
Table 1 Terminal explanation
No.
Symbol
1
PGND
2
PGND
3
N.C.
4
N.C
Description
No.
Symbol
Power GND terminal
13
RT
Power GND terminal
14
RSET
15
PDET
16
PIO
No wire connection.
(Connect to GND. )
No wire connection.
(Connect to GND. )
SW terminal
Description
Frequency adjustment resistance
connection terminal
Off latch effective time adjustment
resistance terminal
Error state notification terminal
17
CTL
Error state notification
and external IC error detection terminal
Enable input
SW terminal
High side Power MOS gate drive
power source terminal
Internal power supply (5.0V) output
terminal
GND
18
VCC
VCC power supply terminal
19
PVCC
Power VCC terminal
20
PVCC
Power VCC terminal
21
TEST2
Test terminal (Connect to GND. )
FC
Phase amends terminal
22
TEST1
11
FB
Feedback terminal
23
N.C.
12
SS
Soft start adjustment capacity
connection terminal
24
N.C.
Test terminal (Connect to GND. )
No wire connection.
(Connect to GND. )
No wire connection.
(Connect to GND. )
5
SW
6
SW
7
BOOT
8
VREG5
9
GND
10
※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 ROHM Co., Ltd. All rights reserved.
4/14
2009.05 - Rev.A
Technical Note
BD8628EFV, BD8624EFV
●Terminal equivalent circuit chart
Terminal
No.
Terminal
name
1
PGND
2
PGND
Explanation
Terminal equivalent circuit chart
Power GND
(The same potential as the GND
terminal)
Power GND
(The same potential as the GND
terminal)
PVCC
5
SW
PVCC
SW terminal
⑤
⑥
6
SW
SW terminal
PGND
VREG5
7
BOOT
High side Power MOS gate drive
power source terminal
⑦
PGND
8
VREG5
9
GND
10
FC
Internal power supply (5.0V) output
terminal
GND
Phase amends terminal
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© 2009 ROHM Co., Ltd. All rights reserved.
5/14
2009.05 - Rev.A
Technical Note
BD8628EFV, BD8624EFV
Terminal
No.
Terminal
name
Explanation
Terminal equivalent circuit chart
VCC
VCC
11
FB
Voltage detection terminal
⑪
GND
12
SS
Soft start adjustment capacity
connection terminal
13
RT
Frequency adjustment resistance
connection terminal
14
RSET
Off latch effective time adjustment
resistance terminal
15
PDET
Error state notification terminal
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© 2009 ROHM Co., Ltd. All rights reserved.
6/14
2009.05 - Rev.A
Technical Note
BD8628EFV, BD8624EFV
Terminal
No.
Terminal
name
16
PIO
Error state notification and external
IC error detection terminal
17
CTL
Enable input
21
TEST2
Test terminal (Connect to GND. )
22
TEST1
Test terminal (Connect to GND. )
19
PVCC
Power VCC terminal
20
PVCC
Power VCC terminal
Explanation
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© 2009 ROHM Co., Ltd. All rights reserved.
Terminal equivalent circuit chart
7/14
2009.05 - Rev.A
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
ON control
VIHCTL
>VLVP+VLVP_HYS
OFF
1.1V(typ)
Enable
>VIHCTL
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