SG6846B Fairchild Semiconductor, SG6846B Datasheet - Page 6

• Manufacturer Part Number: SG6846B
• Description: The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6846B • Rev. 1.3.4
V
V
Feedback Input Section
Current Sense Section
Electrical Characteristics
V
DD
IN
DD
V
V
Symbol
t
t
t
SS-130KHz
V
V
V
D-VDDOVP
Z
V
V
V
SS-65KHz
V
V
V
I
STH1V-2/3
STH3V-2/3
t
V
t
V
I
Section
I
DD-OVP
D-Short
V
D-OCP
DD-SCP
DD-OVP
= 15V and T
Section
DD-OFF
DD-ST
DD-OP
SENSE
t
SLOPE
Z
STH1V
STH3V
DD-ON
IN-OFF
DD-OP
DD-LH
t
A
IN-ON
LEB
FBO
PD
FB
V
Input Impedance
Delay to Output
Leading-edge Blanking Time
Slope Compensation
Threshold Voltage for Current Limit
Threshold Voltage for Current Limit
OCP Threshold Voltage for Current Limit
OCP Threshold Voltage for Current Limit
Delay Time for Over-Current Protection
Output Short Circuit Protection delay time
Period During Soft Start Time
Input-Voltage to Current-Sense Attenuation
Input Impedance
FB Pin Open Voltage
Continuously Operating Voltage
Turn-on Threshold Voltage
Turn-off Voltage
Threshold Voltage on V
Protection
Threshold Voltage for Latch-off Release
Startup Current
Operating Supply Current
V
V
V
PWM Turn-off Threshold Voltage
PWM Turn-on Threshold Voltage
DD
DD
DD
A
= 25°C unless otherwise noted.
Over-Voltage Protection (Latch off)
OVP Debounce Time
OVP Latch-off Holding Current
Parameter
DD
for Short-Circuit
6
V
GATE Open
R
V
Duty = DCY
V
V
V
V
R
V
V
R
R
DD-ON
DD
IN
IN
IN
IN
CS
DD
I
I
I
I
= 26kΩ
= 26kΩ
= 26kΩ
= 13kΩ
Test Condition
= 1V
= 3V
= 1V
= 3V
> V
= 5V
< V
– 0.16V
STH
DD-SCP
, R
MAX
I
= 26kΩ,
V
V
+0.18
+0.5V
Min.
0.65
1/3.5
15.5
0.30
0.80
0.67
0.58
0.48
2.25
DD-OFF
IN-OFF
270
175
9.5
4.0
5.2
4.5
Continued on following page…
23
30
3
6
V
V
+0.20
+1.0V
Typ.
0.70
1/4.0
16.5
10.5
IN-OFF
0.33
0.83
0.70
0.61
0.51
2.50
DD-OFF
150
100
360
200
3.7
5.0
5.5
6.2
12
24
50
4
8
7
V
V
+0.22
+1.5V
0.75
Max.
1/4.5
IN-OFF
0.36
0.86
0.73
0.64
0.54
2.75
17.5
11.5
DD-OFF
250
225
5.5
5.0
7.0
6.6
20
30
25
70
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8
5
Unit
V/V
mA
kΩ
kΩ
ms
ms
ms
ms
µA
µA
ns
ns
µs
V
V
V
V
V
V
V
V
V
V
V
V
V
V