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UC1524 UC2524 UC3524
SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005
ADVANCED REGULATING PULSE WIDTH MODULA...
www.ti.com
UC1524 UC2524 UC3524
SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005
ADVANCED REGULATING PULSE WIDTH MODULATORS
FEATURES
Complete PWM Power Control Circuitry Uncommitted Outputs for Single-Ended or
Push-Pull Applications
Low Standby Current . . . 8 mA Typical Interchangeable With SG1524, SG2524 and
SG3524, Respectively
DESCRIPTION
The UC1524, UC2524 and UC3524 incorporate on a single monolithic chip all the functions required for the construction of regulating power supplies, inverters or switching
regulators. They can also be used as the control element for high-power-output applications. The UC1524 family was designed for switching
regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers and polarity converter applications employing fixedfrequency, pulse-width modulation techniques. The dual alternating outputs allow either single-ended or push-pull applications. Each device includes an on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted output
transistors, a high-gain comparator, and current-limiting and shut-down circuitry. The UC1524 is characterized for operation over the full military temperature range of –55°C to 125°C. The UC2524 and UC3524 are designed for operation from –25°C to 85°C and 0°C to 70°C, respectively.
BLOCK DIAGRAM
VREF 16
OSC OUT 3
VIN 15
RT 6 CT 7 (RAMP)
INV INPUT 1 NI INPUT 2 GROUND 8
REFERENCE OSC
+5V Q
RQ
+5V TO ALL INTE...