UC1525A Datasheet PDF


Part Number

UC1525A

Description

Regulating Pulse Width Modulators

Manufacture

etcTI

Total Page 23 Pages
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Download UC1525A Datasheet PDF


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity UC1525A, UC1527A, UC2525A UC252 7A, UC3525A, UC3527A SLUS191D – FEBRU ARY 1997 – REVISED JULY 2017 UCx52xA Regulating Pulse Width Modulators 1 Fe atures •1 8-V to 35-V Operation • 5 .1-V Reference Trimmed to 1% • 100-Hz to 500-kHz Oscillator Range • Separa te Oscillator Sync Terminal • Adjusta ble Dead-Time Control • Internal Soft Start • Pulse-by-Pulse Shutdown • Input Undervoltage Lockout With Hystere sis • Latching PWM to Prevent Multipl e Pulses • Dual Source and Sink Outpu t Drivers 2 Applications • Off-Line and DC/DC Power Supplies • Converters Using Voltage Mode • Single-Ended or Two-Switch Topology Design.
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UC1525A Datasheet
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
UC1525A, UC1527A, UC2525A
UC2527A, UC3525A, UC3527A
SLUS191D – FEBRUARY 1997 – REVISED JULY 2017
UCx52xA Regulating Pulse Width Modulators
1 Features
1 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 Dead-Time Control
• Internal Soft Start
• Pulse-by-Pulse Shutdown
• Input Undervoltage Lockout With Hysteresis
• Latching PWM to Prevent Multiple Pulses
• Dual Source and Sink Output Drivers
2 Applications
• Off-Line and DC/DC Power Supplies
• Converters Using Voltage Mode
• Single-Ended or Two-Switch Topology Designs
• Solar Inverters
• Welding Inverters
• Motor Control
• Battery Chargers
Block Diagram
OSC
VREF OUT
16 4
+VIN 15
GROUND 12
SYNC 3
RT 6
CT 5
DISCHARGE 7
Reference
Regulator
To Internal
Circutry
OSC
UVLO
Lockout
Flip
Flop
COMPENSATION 9
INV INPUT 1
NI INPUT 2
SOFTSTART 8
Error
Amp
3 kŸ
SHUTDOWN 10
VREF
SR
PWM
Latch
S
50 µA
5 kŸ
NOR
NOR
UC1525A
Output Stage
OR
OR
UC1527A
Output Stage
13 VC
11 OUTPUT A
14 OUTPUT B
13 VC
11 OUTPUT A
14 OUTPUT B
3 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 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LCCC (20)
8.89 mm × 8.89 mm
CDIP (16)
19.56 mm × 6.67 mm
UCx52xA
SOIC (16)
10.30 mm × 7.50 mm
PDIP (16)
19.30 mm × 6.35 mm
PLCC (20)
8.96 mm × 8.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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