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FSB117H Datasheet, PDF (8/18 Pages) Fairchild Semiconductor – mWSaver™ Fairchild Power Switch (FPS™)
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Electrical Characteristics (Continued)
VDD=15V, TA=25°C unless otherwise specified.
Symbol
Parameter
Feedback Input Section
AV
Internal Voltage Dividing Factor of FB Pin(12)
ZFB Pull-Up Impedance of FB Pin
VFB-OPEN FB Pin Pull-Up Voltage
VFB-OLP
FB Voltage Threshold to Trigger Open-Loop
Protection
tD-OLP
VFB-N
VFB-G
VFB-ZDC
Delay of FB Pin Open-Loop Protection
FB Voltage Threshold to Exit Green Mode
FB Voltage Threshold to enter Green Mode
FB Voltage Threshold to Enter Zero-Duty
State
Condition
FB Pin Open
VFB is Rising
VFB is Falling
VFB is Falling
VFB-ZDCR FB Voltage Threshold to Exit Zero-Duty State VFB is Rising
IPK Pin Section
VIPK-OPEN IPK Pin Open Voltage
VIPK-H Internal Upper Clamping Voltage of IPK Pin
VIPK-L Internal Lower Clamping Voltage of IPK Pin
IPK
Internal Current Source of IPK Pin
ILMT-FL-H
Current Limit Plateau when IPK FSB117H
Pin Voltage is Internally Clamped FSB127H
to Upper Limit
FSB147H
TA=-40 to 105°C,
VIPK=2.25V
VIPK=3V,
Duty>40%
ILMT-VA-H
FSB117H
Initial Current Limit when IPK Pin
Voltage is Internally Clamped to FSB127H
Upper Limit
FSB147H
VIPK=3V,
Duty=0%
ILMT-FL-L
Current Limit Plateau when IPK FSB117H
Pin Voltage is Internally Clamped FSB127H
to Lower Limit
FSB147H
VIPK=1.5V,
Duty>40%
ILMT-VA-L
FSB117H
Initial Current Limit when IPK Pin
Voltage is Internally Clamped to FSB127H
Lower Limit
FSB147H
VIPK=1.5V,
Duty=0%
Min. Typ. Max. Unit
1/4.5
15
5.2
1/4.0
21
5.4
1/3.5 V/V
27
kΩ
5.6
V
4.3
4.6
4.9
V
46
56
66
ms
2.4
2.6
2.8
V
VFB-N-0.2
V
1.95
2.05
2.15
V
VFB-ZDC
+0.1
V
3.0
3.5
1.5(12)
4.0
V
3(12)
V
V
45
50
55
µA
0.72
0.80
0.88
0.90
1.00
1.10
A
1.35
1.50
1.65
ILMT-FL-H
-0.20
ILMT-FL-H
-0.25
A
ILMT-FL-H -
0.37
0.36
0.40
0.44
0.45
0.50
0.55
A
0.67
0.75
0.83
ILMT-FL-L
-0.10
ILMT-FL-L
-0.12
A
ILMT-FL-L -
0.18
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FSB117H / FSB127H / FSB147H • Rev. 1.0.5
8
www.fairchildsemi.com
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