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Description
Regulating Pulse Width Modulators
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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 Under voltage Lockout with Hysteresis
● Latching PWM to Prevent Multiple Pulses
● Dual Source/Sink Output Drivers
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 under voltage 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 HlGH output level when OFF.
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
Sarah Jackson
Length of registration:7 years
The UC3525AN UC3525 DIP-16 ORIGINAL STOCK from Utsource is a great integrated circuit for controlling motor speed and other applications. It features a high-speed PWM controller, a high-current totem pole output stage, and an adjustable dead-time generator. This IC is ideal for applications requiring precise motor speed control and low-noise operation.
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03/17/2023
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UC3525AN
UC3525AN has several brands around the world that may have alternate names for UC3525AN due to regional differences or acquisition. UC3525AN may also be known as the following names:
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Stock Status: 10000
Minimum: 2
Total Price:
Unit Price:1.38336
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