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UC3527AN
Regulating Pulse Width Modulators
50 μA VREFError
Amp
To Internal
Circutry
3 k
Reference
Regulator
PWM
Latch
OSC
UVLO
Lockout
Flip
Flop
Output Stage
UC1525A
Output Stage
UC1527A
OUTPUT B
OUTPUT A
OUTPUT B
OUTPUT A
NOR
NOR
VREF
OSC
OUT
+VIN
GROUND
SYNC
DISCHARGE
COMPENSATION
INV INPUT
NI INPUT
SOFTSTART
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UC1525A, UC1527A, UC2525A
UC2527A, UC3525A, UC3527ASLUS191D –FEBRUARY 1997–REVISED JULY 2017
UCx52xA Regulating Pulse Width Modulators Features 8-Vto 35-V Operation 5.1-V Reference Trimmedto 1% 100-Hzto 500-kHz Oscillator Range Separate Oscillator Sync Terminal Adjustable Dead-Time Control Internal Soft Start Pulse-by-Pulse Shutdown Input Undervoltage Lockout With Hysteresis Latching PWMto Prevent Multiple Pulses Dual Source and Sink Output Drivers
Applications Off-Line and DC/DC Power Supplies Converters Using Voltage Mode Single-Endedor Two-Switch Topology Designs Solar Inverters Welding Inverters Motor Control Battery Chargers
Block Diagram DescriptionThe UC1525A/1527A seriesof pulse width modulator
integrated circuits are designed to offer improved
performance and lowered external parts count when
used in designing all types of switching power
supplies. The on-chip 5.1-V referenceis trimmedto and the input common-mode rangeof the error
amplifier includes the reference voltage, eliminating
external resistors.A sync inputto the oscillator allows
multiple unitsto be slaved ora single unit to be
synchronizedto an external system clock.A single
resistor between CT and the discharge terminals
providesa 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.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
