Typical Performance Characteristics continued
Quiescent Supply Current vs. Supply Voltage Over
Shutdown Delay From PWM Comparator
Temperature
10
9
8
7
6
5
4
3
2
1
0
20
OUTPUT at
T
= -55°C
= 25°C
15
A
V
or V
OA
OB
T
A
10
5
V
= 20V
T
= 125°C
IN
L
A
R
= 2kΩ
T
A
= 25˚C
0
5
4
INPUT at V
3
2
1
0
OB
Note: Outputs off. R = ∞
T
Note: Minimum input pulse width
to latch is 200ns
0
10
20
30
40
50
0
1
2
3
SUPPLY VOLTAGE V (V)
DELAY TIME (µs)
IN
Oscillator Frequency vs. Timing Components Resistor
Over Timing Capacitance
Output Dead Time vs. Timing Capacitor Value
1M
10
V
A
= 20V
IN
T
= 25˚C
5.0
V
= 20V
IN
100k
10k
1k
R
= 2700Ω
= 25˚C
T
A
T
2.0
1.0
0.5
0.2
0.1
1.15
Note: Dead time = osc output pulse
width plus output delay
f≈
R C
T
T
100
1
2
5
10
20
50
100
1
2
5
10 20 50
100
TIMING RESISTOR - R (kΩ)
TIMING CAPACITOR - C (nf)
T
T
Current Limit Amplifier Delay
Turn-Off Delay From Shutdown
OUTPUT at COMP
Overdrive
20
6
V
= 20V
IN
5
4
3
2
1
0
15
10
5
5%
R = 2kΩ
L
10%
20%
50%
T
= 25˚C
A
OUTPUT at
OR V
V
O
O
B
A
0
1.0
0.5
0.0
INPUT at I
SENSE+
0.2
0.1
0.0
INPUT at
V
20V T 25˚C
SHUTDOWN
IN
A
EA+ = V
REF
= Gnd
I
SENSE–
Note: Minimum input pulse width
to latch is 200ns
0
1
2
3
4
0
1
2
3
DELAY TIME (µs)
DELAY TIME (µs)
4
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
