UC2524A

ACTIVE

Advanced 40 VCC, double ended 300KHz voltage mode PWM controller with 45% duty cycle, -25C to 85C

Product details

Vin (max) (V) 40 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Catalog Features Adjustable switching frequency, Error amplifier, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 50
Vin (max) (V) 40 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Catalog Features Adjustable switching frequency, Error amplifier, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 50
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Fully Interchangeable with Standard UC1524 Family
  • Precision Reference Internally Trimmed to ±1%
  • High-Performance Current Limit Function
  • Under-Voltage Lockout with Hysteretic Turn-on
  • Start-Up Supply Current Less Than 4mA
  • Output Current to 200mA
  • 60V Output Capability
  • Wide Common-Mode Input Range for both Error and Current Limit Amplifiers
  • PWM Latch Insures Single Pulse per Period
  • Double Pulse Suppression Logic
  • 200ns Shutdown through PWM Latch
  • Guaranteed Frequency Accuracy
  • Thermal Shutdown Protection
  • Fully Interchangeable with Standard UC1524 Family
  • Precision Reference Internally Trimmed to ±1%
  • High-Performance Current Limit Function
  • Under-Voltage Lockout with Hysteretic Turn-on
  • Start-Up Supply Current Less Than 4mA
  • Output Current to 200mA
  • 60V Output Capability
  • Wide Common-Mode Input Range for both Error and Current Limit Amplifiers
  • PWM Latch Insures Single Pulse per Period
  • Double Pulse Suppression Logic
  • 200ns Shutdown through PWM Latch
  • Guaranteed Frequency Accuracy
  • Thermal Shutdown Protection

The UC1524A family of regulating PWM ICs has been designed to retain the same highly versatile architecture of the industry standard UC1524 (SG1524) while offering substantial improvements to many of its limitations. The UC1524A is pin compatible with "non-A" models and in most existing applications can be directly interchanged with no effect on power supply performance. Using the UC1524A, however, frees the designer from many concerns which typically had required additional circuitry to solve.

The UC1524A includes a precise 5V reference trimmed to ±1% accuracy, eliminating the need for potentiometer adjustments; an error amplifier with an input range which includes 5V, eliminating the need for a reference divider; a current sense amplifier useful in either the ground or power supply output lines; and a pair of 60V, 200mA uncommitted transistor switches which greatly enhance output versatility.

An additional feature of the UC1524A is an under-voltage lockout circuit which disables all the internal circuitry, except the reference, until the input voltage has risen to 8V. This holds standby current low until turn-on, greatly simplifying the design of low power, off-line supplies. The turn-on circuit has approximately 600mV of hysteresis for jitter-free activation.

Other product enhancements included in the UC1524A’s design include a PWM latch which insures freedom from multiple pulsing within a period, even in noisy environments, logic to eliminate double pulsing on a single output, a 200ns external shutdown capability, and automatic thermal protection from excessive chip temperature. The oscillator circuit of the UC1524A is usable beyond 500kHz and is now easier to synchronize with an external clock pulse.

The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation from -55°C to +125°C. The UC2524A and 3524A are available in either ceramic or plastic packages and are rated for operation from -25°C to +85°C and 0°C to 70°C, respectively. Surface mount devices are also available.

The UC1524A family of regulating PWM ICs has been designed to retain the same highly versatile architecture of the industry standard UC1524 (SG1524) while offering substantial improvements to many of its limitations. The UC1524A is pin compatible with "non-A" models and in most existing applications can be directly interchanged with no effect on power supply performance. Using the UC1524A, however, frees the designer from many concerns which typically had required additional circuitry to solve.

The UC1524A includes a precise 5V reference trimmed to ±1% accuracy, eliminating the need for potentiometer adjustments; an error amplifier with an input range which includes 5V, eliminating the need for a reference divider; a current sense amplifier useful in either the ground or power supply output lines; and a pair of 60V, 200mA uncommitted transistor switches which greatly enhance output versatility.

An additional feature of the UC1524A is an under-voltage lockout circuit which disables all the internal circuitry, except the reference, until the input voltage has risen to 8V. This holds standby current low until turn-on, greatly simplifying the design of low power, off-line supplies. The turn-on circuit has approximately 600mV of hysteresis for jitter-free activation.

Other product enhancements included in the UC1524A’s design include a PWM latch which insures freedom from multiple pulsing within a period, even in noisy environments, logic to eliminate double pulsing on a single output, a 200ns external shutdown capability, and automatic thermal protection from excessive chip temperature. The oscillator circuit of the UC1524A is usable beyond 500kHz and is now easier to synchronize with an external clock pulse.

The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation from -55°C to +125°C. The UC2524A and 3524A are available in either ceramic or plastic packages and are rated for operation from -25°C to +85°C and 0°C to 70°C, respectively. Surface mount devices are also available.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
TL494 ACTIVE 40V, 0.2A 300KHz PWM controller Supports push-pull topology

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Data sheet Advanced Regulating Pulse Width Modulators datasheet (Rev. B) 13 Apr 2007
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mar 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
PDIP (N) 16 Ultra Librarian
SOIC (DW) 16 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos