?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN9612 " Rev. 1.1.7
6
Electrical Characteristics
Unless otherwise noted, V
DD
= 12 V, T
J
= -40癈 to +125癈. Currents are defined as positive into the device and
negative out of the device.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
Supply
I
STARTUP
Startup Supply Current
V
DD
= V
ON
0.2 V
80
110
礎
I
DD
Operating Current
Output Not Switching
3.7
5.2
mA
I
DD_DYM
Dynamic Operating Current
(5)
f
SW
= 50 kHz; C
LOAD
= 2 nF
4
6
mA
V
ON
UVLO Start Threshold
12.0
12.5
13.0
V
V
OFF
UVLO Stop Threshold Voltage
V
DD
Decreasing
7.0
7.5
8.0
V
V
HYS
UVLO Hysteresis
5.0
V
Bias Regulator (C
5VB
= 0.1 礔)
V
5VB
5VB Output Voltage
T
A
= 25癈; I
LOAD
= 1 mA
5.0
V
Total Variation Over Line,
Load, and Temperature
4.8
5.2
I
OUT_MAX
Maximum Output Current
5.0
mA
Error Amplifier
V
EA
Voltage Reference
T
A
= 25癈
2.95
3.00
3.05
V
Total Variation Over Line,
Load, and Temperature
2.91
3.075
I
BIAS
Input Bias Current
V
FB
= 1 V to 3 V;
|V
SS
V
FB
| d 0.1V
-0.2
0.2
礎
I
OUT_SRC
Output Source Current
V
SS
= 3 V; V
FB
= 2.9 V
-13.7
-8
-4
礎
I
OUT_SINK
Output Sink Current
V
SS
= 3 V; V
FB
= 3.1 V
4
8
12
礎
V
OH
Output High Voltage
4.5
4.7
V5VB
V
V
OL
Output Low Voltage
I
SINK
< 100 礎
0.0
0.1
0.2
V
g
M
Transconductance
50
78
115
祄ho
PWM
V
RAMP,OFST
PWM Ramp Offset
T
A
= 25癈
120
195
270
mV
t
ON,MIN
Minimum On-Time
V
FB
> V
SS
0
祍
Maximum On-Time
V
MOT
Maximum On-Time Voltage
R = 125 k?
1.16
1.25
1.30
V
t
ON,MAX
Maximum On-Time
R = 125 k? V
VIN
= 2.5 V;
V
COMP
> 4.5 V; T
A
= 25癈
3.4
5.0
6.6
祍
Restart Timer (Each Channel)
f
SW,MIN
Minimum Switching Frequency
V
FB
> V
PWM_OFFSET
12.5
16.5
20.0
kHz
Frequency Clamp (Each Channel)
f
SW,MAX
Maximum Switching Frequency
(5)
400
525
630
kHz
Continued on the following page&
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