FAN6751MR Datasheet, PDF (6/13 Pages) Fairchild Semiconductor – Highly-Integrated Green-Mode PWM Controller

Electrical Characteristics
VDD=15V, TA=25°C, unless otherwise noted.
Symbol
Parameter
Feedback Input Section
AV
Input Voltage to Current-Sense
Attenuation
ZFB
VFB-OPEN
VFB-OLP
tD-OLP
Input Impedance
Output High Voltage
FB Open-loop Trigger Level
Delay Time of FB Pin Open-loop
Protection
VFB-N Green-Mode Entry FB Voltage
VFB-G Green-Mode Ending FB Voltage
VFB-ZDC Zero Duty-Cycle Input Voltage
Current-Sense Section
ZSENSE
VTH-P at
VIN=1V
VTH-P at
VIN=3V
tPD
tLEB
VS-SCP
Input Impedance
Threshold Voltage for Current Limit
Threshold Voltage for Current Limit
Delay to Output
Leading-Edge Blanking Time
Threshold Voltage for SENSE Short-
Circuit Protection
tD-SSCP
Delay Time for SENSE Short-Circuit
Protection
TSS Period During Soft-Startup Time
Conditions
FB Pin Open
VIN=1V
VIN=3V
VSENSE<0.15V
Startup Time
Min. Typ. Max. Units
1/4.5
1/4.0
1/3.5
V/V
4
7
kΩ
5.5
V
5.0
5.2
5.4
V
56
ms
2.1
V
1.6
V
1.1
V
12
KΩ
0.80
0.83
0.86
V
0.67
0.70
0.73
V
100
200
ns
230
280
330
ns
0.10
0.15
0.20
V
100
150
200
µs
4.5
5.0
5.5
ms
PWM Frequency
fOSC
fOSC-G
VFB-ZDC V_FB-G
VFB-N
VFB
Figure 5. VFB vs. PWM Frequency
© 2008 Fairchild Semiconductor Corporation
FAN6751MR • Rev. 1.0.0
6
www.fairchildsemi.com