UCC2583D ,Switch Mode Secondary Side Post RegulatorELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for T = –55°Cto125°C ..
UCC2583D ,Switch Mode Secondary Side Post RegulatorBLOCK DIAGRAMUDG-96201-2Note: Pin connections shown for 14-pin packages.SLUS299B - OCTOBER 1998 - R ..
UCC2583D ,Switch Mode Secondary Side Post Regulatorfeatures an undervoltage lockout (UVLO)• Average Current Limiting Loopcircuit, a soft start circuit ..
UCC2583D ,Switch Mode Secondary Side Post RegulatorMAXIMUM RATINGSV ...... 15VDDDIL-14, SOIC-14 (Top View)I ..... 15mAVDDJ, N, or D PackagesRAMP .. –0 ..
UCC2583DG4 ,Switch Mode Secondary Side Post Regulator 14-SOIC -40 to 85UCC1583UCC2583UCC3583Switch Mode Secondary Side Post Regulator
UCC2583N , Switch Mode Secondary Side Post Regulator
UP04211 ,Composite DeviceAbsolute Maximum Ratings T = 25°Ca6 5 4Parameter Symbol Rating UnitRR1 2Collector-base voltage (Em ..
UP04213 ,Composite DeviceComposite TransistorsUP0421x SeriesSilicon NPN epitaxial planar typeUnit : mm+0.050.20(0.30) 0.10±0 ..
UP04214 ,Composite DeviceFeatures• Two elements incorporated into one package5˚123(Transistors with built-in resistor)(0.50) ..
UP04216 ,Composite DeviceFeatures• Two elements incorporated into one package5˚123(Transistors with built-in resistor)(0.50) ..
UP04313 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°Ca• Tr1Parameter Symbol Conditions Min Typ Max UnitCollect ..
UP1B-100-R , Miniature surface mount design
UCC2583D-UCC2583DG4
Switch Mode Secondary Side Post Regulator
UCC1583
UCC2583
UCC3583
FEATURES Precision Secondary Side Post
Regulationfor Multiple Output Power
Supplies Useful for Both Single Ended and
Center Tapped Secondary Circuits Ideal Replacement for Complex
Magnetic Amplifier Regulated Circuits Leading Edge Modulation Does Not Require Gate Drive
Transformer High Frequency (>500kHz) Operation Applicablefor Wide Rangeof Output
Voltages High Current Gate Driver (0.5A
Sink/1.5A Source) Average Current Limiting Loop
DESCRIPTIONThe UCC3583isa synchronizable secondary side post regulator for preci-
sion regulationof the auxiliary outputsof multiple output power supplies.It
containsa leading edge pulse width modulator, which generates the gate
drive signal fora FET power switch connectedin series with the rectifying
diode. The turn-onof the power switchis delayed from the leading edgeof
the secondary power pulseto regulate the output voltage. The UCC3583
containsa ramp generator slavedto the secondary power pulse,a voltage
error amplifier,a current error amplifier,a PWM comparator and associ-
ated logic,a gate driver,a precision reference, and protection circuitry.
The ramp discharge and terminationof the gate drive signal are triggered the synchronization pulse, typically derived from the falling edgeof the
transformer secondary voltage. The ramp starts charging again once its
low thresholdis reached. The gate drive signalis turnedon when the ramp
voltage exceeds the control voltage. This leading edge modulation tech-
nique prevents instability when the UCC3583is usedin peak current mode
primary controlled systems.
The controller operates froma floating power supply referencedto the out-
put voltage being controlled.It features an undervoltage lockout (UVLO)
circuit,a soft start circuit, and an averaging current limit amplifier. The cur-
rent limit canbe programmedtobe proportionalto the output voltage, thus
achieving foldback operationto minimize the dissipation under short circuit
conditions.
(continued)Switch Mode Secondary Side Post Regulator
TYPICAL APPLICATION AND BLOCK DIAGRAM
