TOP244P Offline Switcher 5.85v 1.5mA IC PDIP-8B
The TOP244P belongs to the TOP Switch-GX family of integrated power conversion ICs, designed to simplify the design of switch-mode power supplies (SMPS). It integrates a high-voltage MOSFET, PWM controller, start-up circuitry, and multiple protection features into a single chip, reducing the need for external components. This makes it ideal for compact and cost-effective power supply solutions, especially in offline AC-DC converters.
This IC operates using a Flyback topology and is widely used in low to medium power applications. It offers high efficiency, low standby power consumption, and built-in protections such as overvoltage, under voltage, thermal shutdown, and current limiting. Its design flexibility allows engineers to optimize performance, reduce EMI, and improve reliability in power supply circuits.
Features:
- Integrated high-voltage power MOSFET.
- Built-in PWM controller.
- Internal soft-start function.
- Auto-restart and fault protection.
- Thermal shutdown protection.
- Line overvoltage and under voltage protection.
- Frequency jittering for EMI reduction.
- Adjustable current limit.
- Remote ON/OFF capability.
- Reduced external component count.
Specifications:
| Parameter | Value |
|---|---|
| Switching Frequency | 132 kHz (Internal, fixed for P/G packages) |
| Maximum Duty Cycle | 78% (default) |
| Current Limit (TOP244P/G, 25°C) | 1.00 A (Internal, di/dt = 200 mA/µs) |
| Current Limit (TOP244Y/R/F, 25°C) | 1.35 A (Internal, di/dt = 270 mA/µs) |
| ON-State Resistance (TOP244, 25°C) | 6.0 Ω |
| ON-State Resistance (TOP244, 100°C) | 10.0 Ω |
| CONTROL Pin Shunt Regulator Voltage | 5.85 V |
| Auto-Restart Upper Threshold Voltage | 5.8 V |
| Auto-Restart Lower Threshold Voltage | 4.8 V |
| Thermal Shutdown Temperature | 140 °C |
| Thermal Shutdown Hysteresis | 75 °C |
| Breakdown Voltage (DRAIN pin) | 700 V (Minimum) |
| Soft-Start Time | 10 ms |
| PWM Gain | -23 %/mA |
Pinout:
| Pin | Name |
|---|---|
| 1 | M |
| 2 | S |
| 3 | S |
| 4 | C |
| 5 | D |
| 6 | Not specified |
| 7 | S |
| 8 | S |
Applications:
- AC-DC Flyback power supplies.
- Power adapters.
- Battery chargers.
- TV and monitor power circuits.
- Consumer electronics power systems.
- Industrial SMPS applications.
Packages Included:
- 1x TOP244P Offline Switcher 5.85v 1.5mA IC DIP-8B.
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