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UC2526A Datasheet

  • UC2526A

  • Regulating Pulse Width Modulator

  • 594.39KB

  • 11頁(yè)

  • TI

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UC1526A
UC2526A
UC3526A
Regulating Pulse Width Modulator
FEATURES
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Reduced Supply Current
Oscillator Frequency to 600kHz
Precision Band-Gap Reference
7 to 35V Operation
Dual 200mA Source/Sink Outputs
Minimum Output Cross-Conduction
Double-Pulse Suppression Logic
Under-Voltage Lockout
Programmable Soft-Start
Thermal Shutdown
TTL/CMOS Compatible Logic Ports
5 Volt Operation (V
IN
= V
C
= V
REF
= 5.0V)
DESCRIPTION
The UC1526A Series are improved-performance pulse-width modu-
lator circuits intended for direct replacement of equivalent non- 鈥淎鈥?/div>
versions in all applications. Higher frequency operation has been
enhanced by several significant improvements including: a more ac-
curate oscillator with less minimum dead time, reduced circuit de-
lays (particularly in current limiting), and an improved output stage
with negligible cross-conduction current. Additional improvements
include the incorporation of a precision, band-gap reference gener-
ator, reduced overall supply current, and the addition of thermal
shutdown protection.
Along with these improvements, the UC1526A Series retains the
protective features of under-voltage lockout, soft-start, digital cur-
rent limiting, double pulse suppression logic, and adjustable
deadtime. For ease of interfacing, all digital control ports are TTL
compatible with active low logic.
Five volt (5V) operation is possible for 鈥渓ogic level鈥?applications by
connecting V
IN,
V
C
and V
REF
to a precision 5V input supply. Consult
factory for additional information.
BLOCK DIAGRAM
6/93

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