NCP1212P ON Semiconductor, NCP1212P Datasheet - Page 19

• Manufacturer Part Number: NCP1212P
• Description: IC CTRLR PWM PROG CM OVP 8DIP
• Manufacturer: ON Semiconductor
• Type: PWM Controller for Both Forward and Flyback Convertersr

Specifications of NCP1212P

• Output Isolation: Isolated
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Input Voltage Range: - 0.3 V to + 28 V
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: NCP1212POS

Channel 2 is the CS input pin waveform.
1
2
The skip mode operation waveform at light load is shown in Figure 44. Where Channel 1 is the gate drive pin waveform and
0.1
3
PNP
Q1
4
3 K
R2
100
VCC
Q2
PNP
R8
2.5 K
CS
FB
Figure 43. Suggested Solution for Better Light Load Regulation
9 K
Figure 44. Skip Mode Switching Waveform at Light Load
+5 V
3 R
+
--
300 ns
1 V
LEB
R
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Block
OSC
Output
Output
19
+
+
--
--
Current
Limit
Reset
Set
2
3
4
1
R
S
F/F
Q
Q
Totem Pole
Driver
Output