UC1525B - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

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33 points

Part No

UC1525B
Manufacturer

TI
ChipWorker Part#

CW392910990
Package

CDIP-16
Description

The UC1525B/1527B 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
Documentation

Datasheet
Ships from

Moscow
Наличие

In Stock
Estimated Price

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UC1525B Specifications

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Attribute	Attribute Value

Part Number	UC1525B
Manufacturer	TI
ChipWorker Part#	CW392910990
Documentation	Datasheet
Mounting Style	Through Hole
Case/Package	CDIP-16
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Product Lifecycle Status
RoHS	See ti.com

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Product Description

The UC1525B/1527B 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 +5.1V buried zener reference is trimmed to ±0.75% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provide a wide range of dead time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands. These functions are also controlled by an undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for subnormal input voltages. This lockout circuitry includes approximately 500mV of hysteresis for jitter-free operation. Another feature of these PWM circuits is a latch following the comparator. Once a PWM pulse has been terminated for any reason, the outputs will remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200mA. The UC1525B output stage features NOR logic, giving a LOW output for an OFF state. The UC1527B utilizes OR logic which results in a HIGH output level when OFF.
8 to 35V Operation
5.1V Buried Zener Reference Trimmed to ±0.75%
100Hz to 500kHz Oscillator Range
Separate Oscillator Sync Terminal
Adjustable Deadtime Control
Internal Soft-Start
Pulse-by-Pulse Shutdown
Input Undervoltage Lockout with Hysteresis
Latching PWM to Prevent Multiple Pulses
Dual Source/Sink Output Drivers
Low Cross Conduction Output Stage
Tighter Reference Specifications

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