CS3524A Datasheet, PDF (5/8 Pages) Cherry Semiconductor Corporation – Voltage Mode PWM Control Circuit with 200mA Output Drivers

CS3524A
10
9
8
T_A = −55°C
7
T_A = 25°C
6
T_A = 125°C
5
4
3
2
Note: Outputs off. R_T = ∞
1
0
0
10
20
30
40
50
Supply Voltage V_IN (V)
Figure 4. Quiescent Supply Current vs. Supply
Voltage Over Temperature
20
Output at
15
V_OA or V_OB
10
5
V_IN = 20 V
0
R_L = 2 kΩ
T_A = 25°C
5
4
3
Input at V_OB
2
1
0
Note: Minimum input pulse width to latch is 200 ns.
0
1
2
3
Delay Time (μs)
Figure 5. Shutdown Delay from PWM Comparator
1M
1
2
100 k
3
V_IN = 20 V
T_A = 25°C
4
10 k
5
1. C_T = 1.0 nF
1 k ^{2. CT = 3.0 nF}
3. C_T = 10 nF
4. C_T = 30 nF
5. C_T = 100 nF
100
1
2
5
f
[
1.15
RTCT
10
20
50 100
Timing Resistor, R_T (kΩ)
Figure 6. Oscillator Frequency vs. Timing
Components Resistor Over Timing Capacitance
10
V_IN = 20 V
5.0
R_T = 2700 Ω
T_A = 25°C
2.0
1.0
0.5
0.2
Note: Dead time = osc output
pulse width plus output delay
0.1
1
2
5
10
20
50 100
Timing Capacitor, C_T (nF)
Figure 7. Output Dead Time vs. Timing Capacitor
Value
Output at COMP
6
5
4
Overdrive
5%
10%
3
20%
2
50%
1
0
0.2
Input at I_SENSE+
V_IN = 20 V, T_A = 25°C
0.1
EA+ = V_REF
I_SENSE− = GND
0
0
1
2
3
4
Delay Time (μs)
Figure 8. Current Limit Amplifier Delay
20
15
V_IN = 20 V
10
R_L = 2.0 kΩ
T_A = 25°C
5
Output at
0
V_OA or V_OB
1.0
0.5
Input at
Shutdown
0
Note: Minimum input pulse
width to latch is 200 ns.
0
1
2
3
Delay Time (μs)
Figure 9. Turn−Off Delay from Shutdown
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5