Features

• 8 to 35V Operation

• 5.1V Reference Trimmed to ±1%

• 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

APPLICATIONS

• Applications Using DSPs, Microcontrollers, or Microprocessors

• Wireless Communication Systems

• Portable/Battery-Powered Equipment

• Programmable Controls

• Intelligent Instruments

• Industrial Equipment

• Notebook/Desktop Computers

• Automotive Systems

DESCRIPTION

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 +5.1V reference is trimmed to ±1% 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 provides 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 sub-normal 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 UC1525A output stage features NOR logic, giving a LOW output for an OFF state. The UC1527A utilizes OR logic which results in a HIGH output level when OFF

PART OF STOCK

King--- Originator of ANTERWELL, engaged in the IC electronics industry in 1998 and establish ANTERWELL in 2004. The company is located in Shenzhen Huaqiang North, the largest electronic center in Asia. Our main business is the technical development and electronic products import and export business. Currently, we have branches in Hong Kong and Malaysia.

Up to now. ANTERWELL have more than 1,000,000 types of electronic components in stock. ANTERWELL has become one of the top choices for purchasing IC chips both domestically and internationally. King is a senior IC chip expert, sales engineer, and mentor, leading an elite team with customer first, quality first, honesty, trustworthiness, and mutual benefit. We look forward to cooperate with you to create a better future!

ANTERWELL’s main products include semiconductors, resistors, capacitors, diodes, inductors, connectors, transistors, sensors, etc. Involving the major well-known brands such like: TI, XILINX, FAIRCHILD, STM, MICRON, MICROCHIP, TDK, SAMSUNG, ON, NXP,IR,ADI, ATMEL,VISHAY,LINEAR etc.

ANTERWELL adheres to the development concept and purpose of "direct stock offer, excellent quality, favorable price, and sincere service", which is deeply recognized by domestic and foreign customers. Based on the long-term development goal, ANTERWELL provides customers with standardized, professional, and diversified high-quality services through a strong market service network. ANTEWRELL has multiple skilled and capable executives with a professional QC team and excellent sales team to win the high support and trust of the vast customer base! We provide the best quality, price and service.

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