Overview
The UC2525BDWTR is a pulse width modulator (PWM) integrated circuit designed by Texas Instruments. It is part of the UC2525B series, which offers enhanced performance and reduced external component count for various switching power supply designs. This device features a 5.1V buried zener reference, adjustable deadtime control, internal soft-start circuitry, and pulse-by-pulse shutdown capabilities. It is suitable for a wide range of power supply topologies, including boost, buck, flyback, forward, half-bridge, and push-pull configurations.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage (+VIN) | 8 to 35 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Oscillator Frequency Range | 100 Hz to 500 kHz | |
| Reference Voltage | 5.1V ±0.75% | V |
| Maximum Duty Cycle | 49% | |
| Output Current (Source/Sink) | Up to 200 mA | mA |
| Package Type | SOIC (DW) | |
| Number of Pins | 16 | |
| UVLO Thresholds On/Off | 7.0/6.5 V | V |
Key Features
- 8 to 35V operation
- 5.1V buried zener reference trimmed to ±0.75%
- 100Hz to 500kHz oscillator range
- Separate oscillator sync terminal for synchronization
- Adjustable deadtime control
- Internal soft-start circuitry
- Pulse-by-pulse shutdown capability
- Input undervoltage lockout with hysteresis
- Latching PWM to prevent multiple pulses
- Dual source/sink output drivers capable of sourcing or sinking in excess of 200mA
- Low cross conduction output stage
Applications
The UC2525BDWTR is versatile and can be used in a variety of switching power supply configurations, including:
- Boost converters
- Buck converters
- Flyback converters
- Forward converters
- Half-bridge converters
- Push-pull converters
It is particularly useful in designs requiring high precision, adjustable deadtime, and synchronization capabilities.
Q & A
- What is the operating voltage range of the UC2525BDWTR?
The UC2525BDWTR operates within a voltage range of 8 to 35 volts. - What is the oscillator frequency range of the UC2525BDWTR?
The oscillator frequency range is from 100 Hz to 500 kHz. - What is the reference voltage of the UC2525BDWTR?
The reference voltage is 5.1V, trimmed to ±0.75%. - Does the UC2525BDWTR support synchronization?
Yes, it has a separate oscillator sync terminal for synchronization. - What is the maximum duty cycle of the UC2525BDWTR?
The maximum duty cycle is 49%. - What are the output current capabilities of the UC2525BDWTR?
The output drivers can source or sink up to 200 mA. - What is the package type of the UC2525BDWTR?
The UC2525BDWTR comes in a SOIC (DW) package with 16 pins. - What are the UVLO thresholds for the UC2525BDWTR?
The UVLO thresholds are 7.0V for turn-on and 6.5V for turn-off. - Does the UC2525BDWTR have internal soft-start circuitry?
Yes, it features internal soft-start circuitry. - Can the UC2525BDWTR be used in multiple power supply topologies?
Yes, it can be used in boost, buck, flyback, forward, half-bridge, and push-pull configurations.
