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UC1526 Datasheet

  • UC1526

  • Regulating Pulse Width Modulator

  • 11頁

  • TI

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UC1526
UC2526
UC3526
Regulating Pulse Width Modulator
FEATURES
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8 To 35V Operation
5V Reference Trimmed To
鹵1%
1Hz To 400kHz Oscillator Range
Dual 100mA Source/Sink Outputs
Digital Current Limiting
Double Pulse Suppression
Programmable Deadtime
Under-Voltage Lockout
Single Pulse Metering
Programmable Soft-Start
Wide Current Limit Common Mode Range
TTL/CMOS Compatible Logic Ports
Symmetry Correction Capability
Guaranteed 6 Unit Synchronization
DESCRIPTION
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 pack-
age are a temperature compensated voltage reference, sawtooth os-
cillator, 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 cor-
rection 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 regu-
lators of either polarity, both transformerless and transformer cou-
pled. The UC1526 is characterized for operation over the full military
temperature range of -55擄C to +125擄C. The UC2526 is characterized
for operation from -25擄C to +85擄C, and the UC3526 is characterized
for operation from 0擄 to +70擄C.
BLOCK DIAGRAM
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