UC3525BN
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Texas Instruments UC3525BN

Manufacturer No:
UC3525BN
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC REG CTRLR MULT TOPOLOGY 16DIP
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Payment:
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Product Introduction

Overview

The UC3525BN is a pulse width modulator (PWM) integrated circuit designed by Texas Instruments. It is part of the UC3525B series, which offers enhanced performance and reduced external component count for designing various switching power supplies. This device features a built-in +5.1V buried zener reference, a sync input for oscillator synchronization, and built-in soft-start circuitry. The UC3525BN is particularly useful in applications requiring precise voltage regulation and control over a wide range of operating conditions.

Key Specifications

ParameterValueUnits
Reference Voltage5.062 to 5.138V
Line Regulation5 to 10mV
Load Regulation7 to 15mV
Temperature Stability10 to 50mV
Oscillator Frequency Range100Hz to 400kHz
Oscillator Timing Resistor2kΩ to 150kΩ
Oscillator Timing Capacitor0.001µF to 0.1µF
Dead Time Resistor Range0Ω to 500Ω
Operating Temperature Range0°C to 70°C
Input Voltage Range8V to 35V

Key Features

  • Built-in +5.1V Buried Zener Reference: Trimmed to ±0.75% for high accuracy.
  • Synchronization Capability: Sync input allows multiple units to be slaved or synchronized to an external system clock.
  • Soft-Start Circuitry: Requires only an external timing capacitor for smooth startup.
  • Shut-Down Terminal: Controls both soft-start circuitry and output stages for instantaneous turn-off and soft-start recycle.
  • Adjustable Dead Time: Single resistor between CT and discharge terminals for wide range of dead time adjustment.

Applications

The UC3525BN is suitable for a variety of switching power supply applications, including:

  • DC-DC Converters: High-efficiency power conversion in DC-DC converters.
  • SMPS (Switch-Mode Power Supplies): Used in various SMPS designs requiring precise voltage regulation.
  • Power Management Systems: Integrated into power management systems for reliable and efficient power delivery.

Q & A

  1. What is the operating temperature range of the UC3525BN?
    The UC3525BN operates within a temperature range of 0°C to 70°C.
  2. What is the input voltage range for the UC3525BN?
    The input voltage range is from 8V to 35V.
  3. What is the oscillator frequency range of the UC3525BN?
    The oscillator frequency range is from 100Hz to 400kHz.
  4. Does the UC3525BN have built-in soft-start circuitry?
    Yes, it has built-in soft-start circuitry that requires only an external timing capacitor.
  5. How can the dead time be adjusted in the UC3525BN?
    The dead time can be adjusted using a single resistor between the CT and discharge terminals.
  6. What is the purpose of the sync input in the UC3525BN?
    The sync input allows multiple units to be slaved or synchronized to an external system clock.
  7. What is the reference voltage of the UC3525BN?
    The reference voltage is 5.1V, trimmed to ±0.75%.
  8. Can the UC3525BN be used in DC-DC converters?
    Yes, it is suitable for use in DC-DC converters and other switching power supply applications.
  9. How does the shut-down terminal function in the UC3525BN?
    The shut-down terminal controls both the soft-start circuitry and the output stages, allowing for instantaneous turn-off and soft-start recycle.
  10. What is the package type of the UC3525BN?
    The UC3525BN is available in a PDIP (N) package with 16 pins.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration:Positive
Topology:Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs:2
Output Phases:1
Voltage - Supply (Vcc/Vdd):8V ~ 35V
Frequency - Switching:100Hz ~ 400kHz
Duty Cycle (Max):49%
Synchronous Rectifier:Yes
Clock Sync:Yes
Serial Interfaces:- 
Control Features:Dead Time Control, Frequency Control, Ramp, Soft Start
Operating Temperature:0°C ~ 70°C (TA)
Mounting Type:Through Hole
Package / Case:16-DIP (0.300", 7.62mm)
Supplier Device Package:16-PDIP
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Similar Products

Part Number UC3525BN UC3527BN UC3525AN
Manufacturer Texas Instruments Unitrode Texas Instruments
Product Status Active Active Active
Output Type Transistor Driver Transistor Driver Transistor Driver
Function Step-Up, Step-Down, Step-Up/Step-Down Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration Positive Positive Positive
Topology Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Forward Converter, Push-Pull Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs 2 2 2
Output Phases 1 1 1
Voltage - Supply (Vcc/Vdd) 8V ~ 35V 8V ~ 35V 8V ~ 35V
Frequency - Switching 100Hz ~ 400kHz 100Hz ~ 400kHz 100Hz ~ 400kHz
Duty Cycle (Max) 49% 49% 49%
Synchronous Rectifier Yes Yes Yes
Clock Sync Yes Yes Yes
Serial Interfaces - - -
Control Features Dead Time Control, Frequency Control, Ramp, Soft Start Enable, Frequency Control, Soft Start Enable, Frequency Control, Soft Start
Operating Temperature 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA)
Mounting Type Through Hole Through Hole Through Hole
Package / Case 16-DIP (0.300", 7.62mm) 16-DIP (0.300", 7.62mm) 16-DIP (0.300", 7.62mm)
Supplier Device Package 16-PDIP 16-PDIP 16-PDIP

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