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Current Mode PWM Controller
398
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
- 15 V (typical) @ VCC = 12 V to 25 V, RT = 10 kΩ, CT = 3.3 nF, TA = Tlow to Thigh, unless otherwise noted.
- Supply Current
- ICC (Startup: -) @ VCC = 6.5 V for UCX845A, VCC 14 V for UCX844 mA
- Interface
- GPIO, PWM, ADC
- Resolution
- Not applicable
- Range
- Output voltage: -12 V to 13.5 V (with UVLO activated: -0.1 V to 1.1 V) V
- Accuracy
- Line regulation: -2 mV to +20 mV, Load regulation: -3 mV to +25 mV mV
- Temperature Range
- -25°C to 150°C (storage: -65°C to 150°C)
- Package
- 8-pin dual-in-line plastic package, 14-pin plastic surface mount (SOIC-14)
Pinout
11| 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 |
| 6 | Output | PWM | Drives the gate of a power MOSFET, up to 1.0 A sourced/sunk |
| 7 | VCC | POWER | Positive supply for the control IC |
| 8 | Vref (8-pin package only) | ADC | Reference output, charges CT through RT |
| 5 (14-pin package only) | Power Ground | GND | Separate power ground return for the totem pole output stage |
| 9 | GND (14-pin package only) | GND | Control circuitry ground return, connected back to power source ground |
| 2, 4, 6, 13 | NC | — | No connection for the 14-pin package |
Interactive pinout
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