SG6846A — Highly Integrated Green-Mode PWM Controller
Electrical Characteristics
V
DD
= 15V and T
A
= 25°C unless otherwise noted.
Symbol
V
DD
Section
V
DD-OP
V
DD-ON
V
DD-OFF
V
DD-SCP
V
DD-LH
I
DD-ST
I
DD-OP
V
DD-OVP
t
D-VDDOVP
I
DD-OVP
Parameter
Test Condition
Min.
Typ.
Max.
Unit
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
DD
Over-Voltage Protection (Latch off)
V
DD
OVP Debounce Time
V
DD
OVP Latch-off Holding Current
R
I
= 26kΩ
V
DD
= 5V
V
DD-ON
– 0.16V
GATE Open
22.6
60
30
15.5
9.5
16.5
10.5
20
17.5
11.5
V
V
V
V
V
µA
mA
V
µs
µA
V
DD-OFF
V
DD-OFF
V
DD-OFF
+0.5V +1.0V +1.5V
3
4
8
3.7
23.6
100
50
5
30
5.0
24.6
140
70
V
IN
Section
V
IN-OFF
V
IN-ON
PWM Turn-off Threshold Voltage
PWM Turn-on Threshold Voltage
0.65
V
IN-OFF
+0.18
0.70
V
IN-OFF
+0.20
0.75
V
IN-OFF
+0.22
V
V
Feedback Input Section
A
V
Z
FB
V
FBO
V
FB-OLP
t
D-OLP
Input-Voltage to Current-Sense Attenuation
Input Impedance
FB Pin Open Voltage
Threshold Voltage of Open-loop Protection
Open-loop Protection Delay Time
R
I
= 26kΩ
1/3.5
4.0
5.2
4.7
1600
1/4.0
5.5
6.2
5.2
1700
1/4.5
7.0
6.6
5.7
1800
V/V
kΩ
V
V
ms
Current Sense Section
Z
SENSE
t
PD
t
LEB
V
SLOPE
V
STH1V
V
STH3V
V
STH1V-2/3
V
STH3V-2/3
t
D-OCP
t
D-SCP
t
SS-65KHz
t
SS-130KHz
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
Duty = DCY
MAX
V
IN
= 1V
V
IN
= 3V
V
IN
= 1V
V
IN
= 3V
R
I
= 26kΩ
R
I
= 26kΩ;
V
DD
<V
DD-SCP
R
I
= 26kΩ
R
I
= 13kΩ
270
0.30
0.80
0.67
0.58
0.48
1600
90
4.5
2.25
12
100
360
0.33
0.83
0.70
0.61
0.51
1700
100
5.0
2.50
0.36
0.86
0.73
0.64
0.54
1800
110
5.5
2.75
250
kΩ
ns
ns
V
V
V
V
V
ms
ms
ms
ms
Continued on following page…
© 2008 Fairchild Semiconductor Corporation
SG6846A • Rev. 1.1.4
www.fairchildsemi.com
6
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