Datasheet

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FEATURES

DESCRIPTION

BLOCK DIAGRAM

Reference

Regulator

16 4

OSC

50 m

COMP

+VIN

GROUND

SYNC

DISCHARGE

COMPENSATION

INV INPUT

NI INPUT

SOFTSTART

SHUTDOWN OUTPUT B

OUTPUT A

OUTPUT B

OUTPUT A

NOR

REF

Error

Amp

VREF

OSC

OUT

To Internal

Circutry

UVLO

Lockout

Flip

Flop

PWM

Latch

3 kW

5 kW

UC1527A

Output Stage

UC1525A

Output Stage

UC1525A, UC1527A

UC2525A, UC2527A

UC3525A, UC3527A

SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008

www.ti.com

REGULATING PULSE WIDTH MODULATORS

• 8-V to 35-V Operation

• 5.1-V Reference Trimmed to 1%

The UC1525A/1527A series of pulse width modulator

integrated circuits are designed to offer improved

• 100-Hz to 500-kHz Oscillator Range

performance and lowered external parts count when

• Separate Oscillator Sync Terminal

used in designing all types of switching power

• Adjustable Deadtime Control

supplies. The on-chip +5.1-V reference is trimmed to

1% and the input common-mode range of the error

• Internal Soft-Start

amplifier includes the reference voltage, eliminating

• Pulse-by-Pulse Shutdown

external resistors. A sync input to the oscillator allows

• Input Undervoltage Lockout With Hysteresis

multiple units to be slaved or a single unit to be

synchronized to an external system clock. A single

• Latching PWM to Prevent Multiple Pulses

resistor between the C

and the discharge terminals

• Dual Source/Sink Output Drivers

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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (17 pages)

PAGE 1
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 REGULATING PULSE WIDTH MODULATORS FEATURES 1 • • • • • • • • • • DESCRIPTION 8-V to 35-V Operation 5.
PAGE 2
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION (continued) These functions are also controlled by an undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for sub-normal input voltages.
PAGE 3
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.
PAGE 4
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS +VIN = 20 V, and over operating temperature, unless otherwise specified, TA = TJ PARAMETER TEST CONDITIONS MIN TYP MAX UC152xA, UC252xA 5.05 5.10 5.15 UC352xA 5.0 5.1 5.
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UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS (continued) +VIN = 20 V, and over operating temperature, unless otherwise specified, TA = TJ PARAMETER TEST CONDITIONS MIN TYP 45% 49% 0.7 0.9 MAX UNIT PWM COMPARATOR Minimum duty-cycle 0% Maximum duty-cycle Zero duty-cycle Input threshold (4) Maximum duty-cycle Input bias current (4) V 3.3 3.6 0.05 1.
PAGE 6
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS +VIN 13 +VC Q7 Q5 Q9 Q10 Q4 11 14 +VREF Q6 Q1 5 kW Clock Q2 Q3 10 kW 10 kW F/F Output Q8 Q11 Q6 Ommitted In UC1527A 2 kW PWM Figure 1. UC1525A Output Circuit (1/2 circuit shown) Q1 +VSUPPLY To Output Filter R1 R2 13 +VC A 11 UC1525A B 14 GND 12 Return Figure 2.
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UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS (continued) +15 V 13 Q1 +VC T1 11 A 30 W D1 UC1525A Q2 B 14 GND 30 W D2 12 D1, D2: UC3611 Return Figure 3. Output Drivers With Low Source Impedance The low source impedance of the output drivers provides rapid charging of power FET input capacitance while minimizing external components.
PAGE 8
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS (continued) +VSUPPLY Q1 T1 C1 13 +VC R1 A 11 UC1525A Q2 30 W B 14 GND C2 R2 12 Return D1, D2: UC3611 Figure 6. Low Power Transformers Low power transformers can be driven by the UC1525A. Automatic reset occurs during dead time, when both ends of the primary winding are switched to ground. VREF 16 Q1 Q5 Q8 7.
PAGE 9
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS (continued) Shutdown Options (See Block Diagram) Since both the compensation and soft-start terminals (Pins 9 and 8) have current source pull-ups, either can readily accept a pull-down signal which only has to sink a maximum of 100 A to turn off the outputs.
PAGE 10
UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A www.ti.com SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS (continued) VREF Reference Regulator 16 Clock 0.1 0.1 3 kW SYNC 10 kW RT 0.1 Flip/ Flop A 11 3 6 1.5 kW Ramp Out A Oscillator Deadtime 3.6 kW .009 VC 13 4 PWM Adj. +VIN 15 1 k, 1 W (2) 7 B 100 W 14 5 .001 Out B Comp 0.1 1 = VOS 2 = I(+) 3 = I(−) − V/I Meter + 1 2 3 1 2 3 10 kW 0.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UC2525ADWTR Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC2525ADWTR SOIC DW 16 2000 367.0 367.0 38.
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