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Current Mode PWM Controller
399
ic
The UC3844/UC3845 series are high-performance current mode controllers designed for off-line and DC-to-DC converters, featuring fixed frequency operation, current sensing, and adjustable output deadtime.
In stock
Specifications
8- Operating Voltage
- 12 V to 25 V (VCC) / -0.3 to +5.5 V (Vin) / 4.95 V to 5.05 V (Vref)
- Supply Current
- ICC = 0.5 mA to 17 mA mA
- Interface
- GPIO, PWM, I2C, SPI, UART, POWER, GND
- Resolution
- Not specified
- Range
- 47 kHz to 60 kHz (fosc) kHz
- Accuracy
- -2.0 mV/°C (TS) mV/°C
- Temperature Range
- -55°C to 125°C °C
- Package
- 8-pin dual-in-line plastic, 14-pin plastic surface mount (SOIC-14)
Pinout
13| Pin | Name | Functions | Notes |
|---|---|---|---|
| 1 | Compensation | GPIO | Error Amplifier output |
| 2 | Voltage Feedback | GPIO | Inverting input of the Error Amplifier |
| 3 | Current Sense | PWM | Input for current sensing and PWM termination |
| 4 | RT/CT | GPIO | Programs oscillator frequency and maximum output duty cycle |
| 5 | GND (8-pin package only) | GND | Control circuitry and power ground for 8-pin package |
| 6 | Output | PWM | Drives the gate of a power MOSFET, up to 1A source/sink |
| 7 | VCC | POWER | Positive supply for the control IC |
| 8 | Vref | GPIO | Reference output, charges CT through RT |
| 9 | GND (14-pin package only) | GND | Control circuitry ground return for 14-pin package |
| 10 | Output (14-pin package only) | PWM | Directly drives the gate of a power MOSFET, up to 1A source/sink |
| 11 | VC (14-pin package only) | GPIO | Sets Output high state voltage |
| 12 | GND (14-pin package only) | GND | Control circuitry ground return for 14-pin package |
| 13 | NC (14-pin package only) | GPIO | Not internally connected, no connection |
Interactive pinout
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