(PDF) UC2527A Datasheet PDF | etcTI





UC2527A Datasheet PDF

Part Number UC2527A
Description Regulating Pulse Width Modulators
Manufacture etcTI
Total Page 23 Pages
PDF Download Download UC2527A 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 Designs • Solar Inverters • Welding Inverters • Mot or Control • Battery Chargers Block Diagram OSC VREF OUT 16 4 +VIN 15 GROU ND 12 SYNC 3 RT 6 CT 5 DISCHARGE 7 Ref erence Regulator To Internal Circutry O SC UVLO Lockout Flip Flop COMPENSATION 9 INV INPUT 1 NI INPUT 2 SOFTSTART 8 Error Amp 3 kŸ SHUTDO.

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UC2527A 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.

UC2527A datasheet
UC1525A, UC1527A, UC2525A
UC2527A, UC3525A, UC3527A
SLUS191D – FEBRUARY 1997 – REVISED JULY 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 9
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application ................................................. 10
9 Power Supply Recommendations...................... 16
10 Layout................................................................... 16
10.1 Layout Guidelines ................................................. 16
10.2 Layout Example .................................................... 16
11 Device and Documentation Support ................. 17
11.1 Documentation Support ....................................... 17
11.2 Related Links ........................................................ 17
11.3 Community Resources.......................................... 17
11.4 Trademarks ........................................................... 17
11.5 Electrostatic Discharge Caution ............................ 17
11.6 Glossary ................................................................ 17
12 Mechanical, Packaging, and Orderable
Information ........................................................... 17
4 Revision History
Changes from Revision C (January 2008) to Revision D
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
• Added Thermal Information table ........................................................................................................................................... 5
• Changed RθJA values in the Thermal Information table: from 80-120 to N/A for J; from 90 to 47.6 for N; from 45-90 to
72.6 for DW; from 43-75 to 55.8 for FN; and from 70-80 to N/A for FK ................................................................................ 5
• Changed RθJC values in the Thermal Information table: from 28 to 37.4 (top) and 10.1 (bottom) for J; from 45 to 37.3
(top) for N; from 25 to 34 (top) for DW; from 34 to 33.7 (top) for FN; and from 20 to 32.9 (top) to 3.5 (bottom) for FK ...... 5
2 Submit Documentation Feedback
Copyright © 1997–2017, Texas Instruments Incorporated
Product Folder Links: UC1525A UC1527A UC2525A UC2527A UC3525A UC3527A




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