?2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6932 " Rev. 1.1.3
9
Electrical Characteristics (Continued)
V
DD
=15V, T
A
= 25癈 unless otherwise noted.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
PWM Stage
FBPWM
A
V
FB to current Comparator Attenuation
2.2
2.7
3.2
V/V
ZFB
Input Impedance
4
5
7
k&
FB
OPEN-LOOP
PWM Open-Loop Protection Voltage
4.2
4.5
4.8
V
t
OPEN-PWM-
Hiccup
Interval of PWM Open-Loop
Protection Reset
R
I
=24k&
500
600
700
ms
t
OPEN-PWM
PWM Open-Loop Protection
Delay Time
R
I
=24k&
80
95
120
ms
V
N
Frequency Reduction Threshold on FBPWM
1.9
2.1
2.3
V
PWM Current Sense
t
PD-PWM
Propagation Delay to Output
V
LIMIT
Loop
V
DD
=15V, OPWM
Drops to 9V
60
120
ns
V
LIMIT
Peak Current Limit Threshold Voltage
0.65
0.70
0.75
V
t
Bnk-PWM
Leading-Edge Blanking Time
270
350
450
ns
砎
SLOPE
Slope Compensation 砎
S
=砎
SLOPE
(t
on
/t) 砎
S
:
Compensation Voltage Added to Current Sense
0.40
0.45
0.55
V
Output Driver
V
Z-PWM
Output Voltage Maximum
(Clamp)
V
DD
=20V
16
18
V
V
OL-PWM
Output Voltage Low
V
DD
=15V; I
O
=100mA
1.5
V
V
OH-PWM
Output Voltage High
V
DD
=13V; I
O
=100mA
8
V
t
R-PWM
Rising Time
V
DD
=15V; C
L
=5nF;
O/P=2V to 9V
30
60
120
ns
t
F-PWM
Falling Time
V
DD
=15V; C
L
=5nF;
O/P=9V to 2V
30
50
110
ns
Maximum Duty Cycle
DC
SS=6V
Maximum Duty Cycle for SS=6V R
I
=24k&
62
66
%
DC
SS=5V
Maximum Duty Cycle for SS=5V R
I
=24k&
46
50
%
Soft Start
I
SS
Constant Current Output for
Soft-Start
R
I
=24k&
44
50
56
糀
V
DC-MAX-50%
Voltage of SS for 50% Maximum Duty Cycle
5
V
V
DC-MAX-65%
Voltage of SS for 65% Maximum Duty Cycle
6
V
R
D
Discharge Resistance
470
&
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