UC3526

稳压脉宽调制器

The UC1526 is a high performance monolithic pulse width modulator circuit designed for fixed-frequency switching regulators and other power control applications. Included in an 18-pin dual-in-line package are a temperature compensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and setting logic, and two low impedance power drivers. Also included are protective features such as soft-start and under-voltage lockout, digital current limiting, double pulse inhibit, a data latch for single pulse metering, adjustable deadtime, and provision for symmetry correction inputs. For ease of interface, all digital control ports are TTL and B-series CMOS compatible. Active LOW logic design allows wired-OR connections for maximum flexibility. This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless and transformer coupled. The UC1526 is characterized for operation over the full military temperature range of -55°C to +125°C. The UC2526 is characterized for operation from -25°C to +85°C, and the is characterized for operation from 0° to +70°C.

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8 To 35V Operation

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5V Reference Trimmed To ±1%

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1Hz To 400kHz Oscillator Range

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Dual 100mA Source/Sink Outputs

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Digital Current Limiting

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Double Pulse Suppression

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Programmable Deadtime

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Under-Voltage Lockout

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Single Pulse Metering

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Programmable Soft-Start

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Wide Current Limit Common Mode Range

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TTL/CMOS Compatible Logic Ports

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Symmetry Correction Capability

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Guaranteed 6 Unit Synchronization