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UC1525AL Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte UC1525AL
Spiegazioni elettronici  REGULATING PULSE WIDTH MODULATORS
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

UC1525AL Scheda tecnica(HTML) 1 Page - Texas Instruments

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1
FEATURES
DESCRIPTION
BLOCK DIAGRAM
15
12
3
6
5
7
9
1
2
8
10
Reference
Regulator
16
4
OSC
50 m A
13
14
11
13
11
14
COMP
S
S
R
+VIN
GROUND
SYNC
RT
CT
DISCHARGE
COMPENSATION
INV INPUT
NI INPUT
SOFTSTART
SHUTDOWN
OUTPUT B
OUTPUT A
VC
OUTPUT B
OUTPUT A
VC
NOR
NOR
OR
OR
VREF
Error
Amp
VREF
OSC
OUT
To Internal
Circutry
UVLO
Lockout
Flip
Flop
PWM
Latch
3 kW
5 kW
UC1527A
Output Stage
UC1525A
Output Stage
UC1525A, UC1527A
UC2525A, UC2527A
UC3525A, UC3527A
SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008
www.ti.com
REGULATING PULSE WIDTH MODULATORS
• 8-V to 35-V Operation
• 5.1-V Reference Trimmed to 1%
The UC1525A/1527A series of pulse width modulator
integrated circuits are designed to offer improved
• 100-Hz to 500-kHz Oscillator Range
performance and lowered external parts count when
• Separate Oscillator Sync Terminal
used in designing all types of switching power
• Adjustable Deadtime Control
supplies. The on-chip +5.1-V reference is trimmed to
1% and the input common-mode range of the error
• Internal Soft-Start
amplifier includes the reference voltage, eliminating
• Pulse-by-Pulse Shutdown
external resistors. A sync input to the oscillator allows
• Input Undervoltage Lockout With Hysteresis
multiple units to be slaved or a single unit to be
synchronized to an external system clock. A single
• Latching PWM to Prevent Multiple Pulses
resistor between the CT and the discharge terminals
• Dual Source/Sink Output Drivers
provides a wide range of dead-time adjustment.
These devices also feature built-in soft-start circuitry
with only an external timing capacitor required. A
shutdown terminal controls both the soft-start circuitry
and the output stages, providing instantaneous turn
off through the PWM latch with pulsed shutdown, as
well as soft-start recycle with longer shutdown
commands.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 1997–2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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