UNISONIC TECHNOLOGIES CO., LTD
U3525U
LINEAR INTEGRATED CIRCUIT
REGULATING PWM IC
DESCRIPTION
The UTC U3525U is a pulse width modulator IC and designed
for switching power supplies application to improve performance
and reduce external parts usage.
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. The output stage features NOR logic, giving
a LOW output for an OFF state. An under-voltage lockout circuitry,
which keeps the outputs off and the soft-start capacitor discharged
for sub-normal input voltages, includes approximately 500 mV of
hysteresis for jitter free operation. The PWM circuits also feature a
latch following the comparator. When a PWM pulses has been
terminated, the outputs will remain off for the duration of the period.
The latch is reset with each clock pulse. The output stages are
totem-pole designs capable of sourcing or sinking in excess of
200mA.
FEATURES
* Input Voltage: 8~35V
* On-chip +5.1V reference is trimmed to ±1%
* 100HZ ~ 400KHZ oscillator range
* Separate oscillator sync terminal
* Adjustable dead time control
* Internal soft-start
* Pulse-by-pulse shutdown
* Input under-voltage lockout with hysteresis
* Latching PWM to prevent multiple pulses
* Dual source/sink output drivers
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
U3525UL-D16-T
U3525UL-S16-R
U3525UL-S16W-R
U3525UG-D16-T
U3525UG-S16-R
U3525UG-S16W-R
DIP-16
SOP-16
Tube
Tape Reel
Tape Reel
SOP-16W
U3525UG-D16-T
(1) T: Tube, R: Tape Reel
(1)Packing Type
(2)Package Type
(3)Green Package
(2) D16: DIP-16, S16: SOP-16, S16W: SOP-16W
(3) G: Halogen Free and Lead Free, L: Lead Free
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