SG6846A Fairchild Semiconductor, SG6846A Datasheet - Page 6

• Manufacturer Part Number: SG6846A
• Description: The highly integrated SG6846A series of PWM controllers provides features to enhance the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6846A • Rev. 1.1.5
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
V
V
Z
V
V
SS-65KHz
I
V
STH1V-2/3
STH3V-2/3
V
V
V
t
V
t
I
Section
t
I
DD-OVP
V
D-OCP
D-SCP
DD-SCP
DD-OP
DD-OVP
FB-OLP
D-OLP
SENSE
= 15V and T
Section
DD-OFF
DD-ST
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
Delay Time for Output Short-Circuited
Protection
Period During Startup Time
Input-Voltage to Current-Sense Attenuation
Input Impedance
FB Pin Open Voltage
Threshold Voltage of Open-loop Protection
Open-loop Protection Delay Time
Continuously Operating Voltage
Turn-on Threshold Voltage
Turn-off Voltage
Threshold voltage on VDD for Short-Circuit
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
6
V
GATE Open
R
V
R
Duty = DCY
V
V
V
V
R
R
V
R
R
DD-ON
DD
I
IN
IN
IN
IN
DD
I
I
I
I
I
Test Condition
= 26kΩ
= 26kΩ
= 26kΩ
= 26kΩ;
= 26kΩ
= 13kΩ
= 1V
= 3V
= 1V
= 3V
<V
= 5V
– 0.16V
DD-SCP
MAX
V
V
+0.18
+0.5V
Min.
1600
0.65
1/3.5
1600
15.5
22.6
DD-OFF
0.30
0.80
0.67
0.58
0.48
2.25
IN-OFF
270
9.5
4.0
5.2
4.7
4.5
60
30
90
Continued on following page…
3
V
V
+0.20
+1.0V
0.70
Typ.
1700
1/4.0
1700
16.5
10.5
23.6
IN-OFF
0.33
0.83
0.70
0.61
0.51
2.50
DD-OFF
100
100
360
100
5.0
3.7
5.5
6.2
5.2
12
50
4
8
V
V
+0.22
+1.5V
Max.
0.75
1/4.5
1800
1800
IN-OFF
0.36
0.86
0.73
0.64
0.54
2.75
17.5
11.5
24.6
DD-OFF
250
110
140
5.5
7.0
6.6
5.7
5.0
20
30
70
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5
Unit
V/V
mA
ms
ms
ms
ms
kΩ
kΩ
ms
µA
µA
ns
ns
µs
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V