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| SG3526 |
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 MOTOROLA
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6 page 
SG3526 6 MOTOROLA ANALOG IC DEVICE DATA Figure 7. VC Saturation Voltage as a Function of Sink Current Figure 8. Oscillator Period Figure 9. Error Amplifier Figure 10. Undervoltage Lockout Figure 11. Pulse Processing Logic The metering Flip–Flop is an asynchronous data latch which suppresses high frequency oscillations by allowing only one PWM pulse per oscillator cycle. The memory Flip–Flop prevents double pulsing in a push–pull configuration by remembering which output produced the last pulse. 2.0 5.0 10 20 50 100 200 IC, SINK CURRENT (mA) OSCILLATOR PERIOD (ms) RD = 0 Ω VCC Q6 Q5 Vref 125 µA Q3 Q4 50 µA Q8 Q9 500 1.0k Q2 1 + Error – Error Q10 3 Compensation Q12 Q11 Q7 50 µA 14 µA Q1 1.0k 500 100 µA 14 µA 100 µA 100 µA Vref R1 1.2V Bandgap Reference R2 + – To Reset To Driver A To Driver B Metering F/F S D Q Q Q R S Clock PWM PWM Sync Memory F/F 2.5 2.0 1.5 1.0 0.5 0 200 100 50 20 10 5.0 2.0 |
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