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6 page 
SG3525A http://onsemi.com 6 Figure 3. Oscillator Charge Time versus RT Figure 4. Oscillator Discharge Time versus RD Figure 5. Error Amplifier Open Loop Frequency Response Figure 6. Output Saturation Characteristics 2.0 5.0 10 20 50 100 200 500 1000 2000 5000 10,000 CHARGE TIME ( ms) 6 57 RD * CT RT * RD = 0 W 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 DISCHARGE TIME ( ms) 1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 1 2 9 CP RZ f, FREQUENCY (Hz) − + RZ = 20 k Vref RT CT Sync Discharge GND 16 6 5 3 7 12 Q2 Q1 Q6 Q9 2.0k 2.0k 14k Q10 Q11 5.0pF 400 mA 23k Q4 Q7 1.0k Q12 Q13 3.0k 250 4 Blanking To Output Ramp To PWM Q14 25k 7.4k Q5 Q8 Q3 OSC Output 1.0k 15 Q3 VCC 9 30 Compensation 1 2 Q4 Q1 Q2 Inverting Input 5.8V 100 mA To PWM Comparator 200 mA Noninverting Input Figure 7. Oscillator Schematic 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 1.0 IO, OUTPUT SOURCE OR SINK CURRENT (A) Sink Sat, (VOL) Source Sat, (VC−VOH) VCC = +20 V TJ = +25°C Figure 8. Error Amplifier Schematic 200 100 50 20 10 5.0 2.0 500 400 300 200 100 0 100 80 60 40 20 0 −20 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 |
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