Texas Instruments UC1527A
The UC1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip 5.1-V reference is trimmed to 1% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. These devices also feature built-in soft-start circuitry with only an external timing capacitor required.| Part No. | UC1527A |
|---|---|
| Datasheet | UC1527A Download |
| Manufacturer |  Texas Instruments |
| Description | Regulating Pulse Width Modulators |
| Buy | Stock & Price |
FEATURES
●1 8-V to 35-V Operation● 5.1-V Reference Trimmed to 1%
● 100-Hz to 500-kHz Oscillator Range
● Separate Oscillator Sync Terminal
● Adjustable Dead-Time Control
● Internal Soft Start
● Pulse-by-Pulse Shutdown
● Input Undervoltage Lockout With Hysteresis
● Latching PWM to Prevent Multiple Pulses
● Dual Source and Sink Output Drivers 2
APPLICATIONS
● Off-Line and DC/DC Power Supplies● Converters Using Voltage Mode
● Single-Ended or Two-Switch Topology Designs
● Solar Inverters
● Welding Inverters
● Motor Control
● Battery Chargers Block Diagram OSC VREF OUT 16 4 +VIN 15 GROUND 12 SYNC 3 RT 6 CT 5 DISCHARGE 7 Reference Regulator To Internal Circutry OSC UVLO Lockout Flip Flop COMPENSATION 9 INV INPUT 1 NI INPUT 2 SOFTSTART 8 Error Amp 3 kŸ SHUTDOWN 10 VREF SR PWM Latch S 50 µA 5 kŸ NOR NOR UC1525A Output Stage OR OR UC1527A Output Stage 13 VC 11 OUTPUT A 14 OUTPUT B 13 VC 11 OUTPUT A 14 OUTPUT B 3
DESCRIPTION
A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock.
