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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

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 +5.1-V 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.
1FEATURES
• 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 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

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UC3525ADW Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	16 Pin
Case/Package	SOIC-16
Frequency	500 kHz
Supply Voltage (DC)	4.50V (min)
Number of Outputs	2 Output
Input Voltage (DC)	35.0 V
Output Voltage	18 V
Output Current	100 mA
Number of Positions	16 Position
Power Dissipation	1000 mW
Quiescent Current	14.0 mA
Number of Regulated Outputs	2 Output
Rise Time	100 ns
Switching Frequency	100Hz ~ 400kHz
Topology	Buck, Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Duty Cycle	45 %
Maximum Duty Cycle	49 %
Fall Time	50 ns
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	0 ℃
Power Dissipation (Max)	1000 mW
Supply Voltage	8V ~ 35V
Supply Voltage (Max)	35 V
Supply Voltage (Min)	4.5 V
Input Voltage	35 V
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Size-Length	10.28 mm
Size-Width	7.52 mm
Size-Height	2.35 mm
Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance Edition	2015/06/15
ECCN Code	EAR99

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