Data Sheet

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN7621S • Rev. 1.0.1 5
FAN7621S — PFM Controller for Half-Bridge Resonant Converters
Electrical Characteristics
T
A
=25°C and LV
CC
=17V unless otherwise specified.
Symbol Parameter Test Conditions
Min. Typ. Max.
Unit
Supply Section
I
LK
Offset Supply Leakage Current HV
CC
=V
CTR
50 μA
I
Q
HV
CC
Quiescent HV
CC
Supply Current (HV
CC
UV+) - 0.1V 50 120 μA
I
Q
LV
CC
Quiescent LV
CC
Supply Current (LV
CC
UV+) - 0.1V 100 200 μA
I
O
HV
CC
Operating HV
CC
Supply Current
(RMS Value)
f
OSC
=100kHz, C
Load
=1nF 5 8 mA
No Switching 100 200 μA
I
O
LV
CC
Operating LV
CC
Supply Current
(RMS Value)
f
OSC
=100kHz, C
Load
=1nF 6 9 mA
No Switching 2 4 mA
UVLO Section
LV
CC
UV+ LV
CC
Supply Under-Voltage Positive-Going Threshold (LV
CC
Start) 11.2 12.5 13.8 V
LV
CC
UV- LV
CC
Supply Under-Voltage Negative-Going Threshold (LV
CC
Stop) 8.9 10.0 11.1 V
LV
CC
UVH LV
CC
Supply Under-Voltage Hysteresis 2.5 V
HV
CC
UV+ HV
CC
Supply Under-Voltage Positive-Going Threshold (HV
CC
Start) 8.2 9.2 10.2 V
HV
CC
UV-
HV
CC
Supply Under-Voltage Negative-Going Threshold (HV
CC
Stop)
7.8 8.7 9.6 V
HV
CC
UVH HV
CC
Supply Under-Voltage Hysteresis 0.5 V
Oscillator & Feedback Section
V
RT
V-I Converter Threshold Voltage
R
T
=5.2kΩ
1.5 2.0 2.5 V
f
OSC
Output Oscillation Frequency 94 100 106 kHz
DC Output Duty Cycle 48 50 52 %
f
SS
Internal Soft-Start Initial Frequency
f
SS
=f
OSC
+40kHz, R
T
=5.2kΩ
140 kHz
t
SS
Internal Soft-Start Time 2 3 4 ms
Output Section
I
source
Peak Sourcing Current HV
CC
=17V 250 360 mA
I
sink
Peak Sinking Current HV
CC
=17V
460 600 mA
t
r
Rising Time
C
Load
=1nF, HV
CC
=17V
65 ns
t
f
Falling Time 35 ns
V
HOH
High Level of High-Side Gate Driving
Signal (V
HVCC
-V
HO
)
I
O
=20mA
1.0 V
V
HOL
Low Level of High-Side Gate Driving
Signal
0.6 V
V
LOH
High Level of High-Side Gate Driving
Signal (V
LVCC
-V
LO
)
1.0 V
V
LOL
Low Level of High-Side Gate Driving
Signal
0.6 V