Datasheet
3/16
Technical Note
BD9781HFP (Unless otherwise specified, Ta=
-
40˚C ~ +125˚C,VIN=13.2V,VEN/SYNC=5V)
Parameter Symbol
IOLIMIT
IOLEAK
VREF2
VREF1
∆VREF
IQ
ISTB
RON
IB
VFBH
VFBL
IFBSINK
IFBSOURCE
TSS
FOSC
VEN/SYNC
IEN/SYNC
FSYNC
∆FOSC
ConditionUnit
A
µA
V
%
mA
Ω
µA
V
V
mA
µA
mS
kHz
V
µA
kHz
%
V
EN/SYNC=5V
V
EN/SYNC=0V,Ta=25ºC
F
EN/SYNC=150kHz
V
FB=VINV
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
R
T=390kΩ
V
IN=5 ~ 35V
V
IN=5 ~ 35V
V
INV=1.1V
V
INV=0.5V
VINV=1.5V
VIN=35V,VEN/SYNC=0V
IO=0A
I
SW=50mA
* Design assurance
* Design assurance
[Enable/Synchronizing input block]
Threshold voltage
Sink current
External synchronizing frequency
Limits
Typ.Min. Max.
0.97
-
-
4
-
-
1
2.4
70
-
-
82
-
0.8
-
-
-
-
5.0
1.00
3
0.5
8
0.5
-
2.5
120
0.05
5
102
1
1.7
35
150
0
-
3.0
1.03
VV
FB=VINV,Ta=25ºC0.98 1.00 1.02
8
0.9
-
-
-
-
170
0.10
-
122
-
2.6
90
-
30
µA
-
010
-
0.5
* Not designed to be radiation-resistant.
Circuit current
Standby circuit current
Reference voltage2
Reference voltage1
[Error Amp block]
Reference voltage input regulation
Input bias current
Maximum FB voltage
Operating output current of overcurrent protection
Output leak current
[SW block]
POWER MOS FET ON resistance
Minimum FB voltage
FB sink current
FB source current
Soft start time
[Oscillator block]
Oscillation frequency
Frequency input regulation
BD9001F (Unless otherwise specified, Ta=
-
40˚C ~ +95˚C,VIN=13.2V, VEN=5V)
[Enable block]
Threshold voltage
Sink current
Circuit current
Standby circuit current
Reference voltage 2
Reference voltage 1
[Error Amp block]
Reference voltage input regulation
Input bias current
Maximum FB voltage
Parameter
Operating output current of overcurrent protection
VEN
IEN
Symbol
I
OLIMIT
VREF2
VREF1
∆VREF
IQ
ISTB
RON
IB
VFBH
VFBL
IFBSINK
IFBSOURCE
Tss
FOSC
∆FOSC
Condition
V
µA
Unit
A
V
V
%
mA
Ω
µA
µA
V
V
mA
ms
µA
kHz
%
V
FB=VINV
VFB=1.5V,VINV=1.5V
V
FB=1.5V,VINV=0.5V
R
T=390kΩ
V
IN=7 ~ 48V
V
IN=7 ~ 48V
V
EN =5V
V
INV=1.1V
VINV=0.5V
V
INV=1.5V
IO=0A
I
SW=50mA
* Design assurance
* Design assurance
[SW block]
POWER MOS FET ON resistance
Minimum FB voltage
FB sink current
FB source current
Soft start time
[Oscillator block]
Oscillation frequency
Frequency input regulation
0.8 1.7
13
2.6
50
Limits
Typ.Min. Max.
0.96
0.98
-
-
-
2.5
-
-
1
2.4
70
-
-
82
-
-
-
5.0
1.00
3
0.6
4
0.5
-
2.5
120
5
0.05
102
2
-
3.0
1.04
1.00 1.02
4.2
410
1.2
-
-
-
-
-
170
0.10
122
-
-
0.5
* Not designed to be radiation-resistant.
VEN=0V,Ta=25˚C
V
FB=VINV,Ta=25˚C
2010.02 -
Rev. B
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BD9778F, BD9778HFP, BD9001F, BD9781HFP