The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.
Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators.
Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.
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| Topology | Boost, Flyback, Forward, SEPIC |
| Vin (min) (V) | 3.5 |
| Vin (max) (V) | 40 |
| Vout (min) (V) | 1.23 |
| Vout (max) (V) | 60 |
| Switch current limit (typ) (A) | 3 |
| Type | Converter |
| Regulated outputs (#) | 1 |
| Switching frequency (min) (kHz) | 52 |
| Switching frequency (max) (kHz) | 52 |
| Iq (typ) (mA) | 10 |
| Features | Nonsynchronous rectification, UVLO Fixed |
| Duty cycle (max) (%) | 95 |
| Operating temperature range (°C) | -40 to 125 |
| Rating | Catalog |
| TO-220 (KC) | 5 | 45.212 mm² 10.16 x 4.45 |
| TO-220 (NDH) | 5 | 86.0552 mm² 10.16 x 8.47 |
| TO-263 (KTT) | 5 | 154.8384 mm² 10.16 x 15.24 |
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