This 3524 PWM monolithic integrated circuit contains all the control circuitry for a regulating power supply inverter or switching regulator. Included in a 16-pin dual-in-line package is the voltage reference, error amplifier, oscillator, pulse-width modulator, pulse steering flip-flop,dual alternating output switches and current-limiting and shut-down circuitry. This device can be used for switching regulators of either polarity, transformer-coupled DC-to-DC converters, transformerless voltage doublers and polarity converters, as well as other power control applications. The SG3524 is designed for commercial applications of 0°C to +70°C.
FEATURES 3524 PWM :
- Maximum Supply Voltage:40V
- Power Dissipation at Tamb,70° C=1000mW
- Collector Output Current=100mA
- Operating Ambient Temperature Range:0°C to 70°C
- Complete PWM power control circuitry
- Single ended or push-pull outputs
- Line and load regulation of 0.2%
- 1% maximum temperature variation
- Total supply current is less than 10mA
- Operation beyond 100kHz
- Mount the SG3524 on a holder.
- All capacitors other than C10 and C11 must be rated at least 15V.
- Preset R9 can be used for adjusting the inverter’s output voltage.
- Preset R1 can be used for adjusting the inverter’s operating frequency.
- Transistors in the driver stage require heatsink.
- T2 is a 220V primary, 12V secondary, 1A transformer.
- T1 is a 12-0-12 V primary, 220V secondary, 300VA transformer.
- Driver transistors must be isolated from the heatsink using mica sheets. Mounting kits for these transistors are easily available in the market.
- An optional finned aluminium heatsink can be attached to the 7808.
- If 1A bridge is not available, make one using four 1N4007 diodes.
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