UCC28086PW ,Current Mode Push-Pull PWM With Programmable Slope CompensationFEATURES APPLICATIONS Programmable Slope Compensation High-Efficiency Switch-Mode Power Supplies ..
UCC28089D ,Primary Side Push-Pull driver with Dead-time ControlUCC28089SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006ABSOLUTEMAXIMUMRATINGS}†over operating fre ..
UCC28089D ,Primary Side Push-Pull driver with Dead-time ControlUCC28089SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006ELECTRICALCHARACTERISTICS:T =--40°Cto105°C ..
UCC28089DR ,Primary Side Push-Pull driver with Dead-time ControlFEATURES APPLICATIONSD Push-PullOscillatorWithProgrammable D HighEfficiencyCascadedConvertersDeadti ..
UCC2808A-1Q1 ,Automotive Catalog Low Power Current Mode Push-Pull PWMFEATURESDPACKAGE• Qualified for Automotive Applications(TOPVIEW)• ESD Protection Exceeds 1500 V Per ..
UCC2808A-2EP ,Enhanced Product Low Power Current Mode Push-Pull PWMUCC2808A-1EP, UCC2808A-2EPLOW POWER CURRENT MODE PUSH-PULL PWM SGLS187B− SEPTEMBER 2003 − REVISED ..
UPA101G-E1 ,12ⅴ8 CROSSPOINT SWITCH WITH CONTROL MEMORYApplications include a multiplier,double balanced mixer, phase detector, or AGC circuit. The two p ..
UPA102G ,Ultra-high-frequency NPN transistor arrayapplicationsinclude: pulse pattern generators, oscillators, differential amps, high speed comparato ..
UPA102G-E1 ,Ultra-high-frequency NPN transistor arrayFEATURES• TWO BUILT-IN DIFFERENTIAL AMPLIFIER CIRCUITS: (Each Transistor has fT 9 GHz)• OUTSTANDING ..
UPA103G ,HIGH FREQUENCY NPN TRANSISTOR ARRAYFEATURES• FIVE MONOLITHIC 9 GHz fT TRANSISTORS:Two of these use a common emitter pin and can be use ..
UPA103G-E1 ,HIGH FREQUENCY NPN TRANSISTOR ARRAYFEATURES• FIVE MONOLITHIC 9 GHz fT TRANSISTORS:Two of these use a common emitter pin and can be use ..
UPA103G-E1 ,HIGH FREQUENCY NPN TRANSISTOR ARRAYAPPLICATIONSThe μPA103 is a user configurable Silicon bipolar transistor array consisting of a comm ..
Current Mode Push-Pull PWM With Programmable Slope Compensation
��������� ��������� ��������� ��������
��������� ��������� ��������� ��������
SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009
����� ������� ���� ��������� ��� �����������
���� ������������ ����� ������������
FEATURES Programmable Slope Compensation Internal Soft-Start on the UCC38083/4 Cycle-by-Cycle Current Limiting Low Start-Up Current of 120 µA and 1.5 mA
Typical Run Current Single External Component Oscillator
Programmable from 50 kHz to 1 MHz High-Current Totem-Pole Dual Output Stage
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability Current Sense Discharge Transistor to
Improve Dynamic Response Internally Trimmed Bandgap Reference Undervoltage Lockout with Hysteresis
APPLICATIONS High-Efficiency Switch-Mode Power Supplies Telecom dc-to-dc Converters Point-of-Load or Point-of-Use Power Modules Low-Cost Push-Pull and Half-Bridge
The UCC38083/4/5/6 is a family of BiCMOS pulse width
modulation (PWM) controllers for dc-to-dc or off-line
fixed-frequency current-mode switching power
supplies. The dual output stages are configured for the
push-pull topology. Both outputs switch at half the
oscillator frequency using a toggle flip-flop. The dead
time between the two outputs is typically 110 ns, limiting
each output’s duty cycle to less than 50%.
The new UCC3808x family is based on the UCC3808A
architecture. The major differences include the addition
of a programmable slope compensation ramp to the CS
signal and the removal of the error amplifier. The current
flowing out of the ISET pin through an external resistor
is monitored internally to set the magnitude of the slope
compensation function. This device also includes an
internal discharge transistor from the CS pin to ground,
which is activated at each clock cycle after the pulse is
terminated. This discharges any filter capacitance on
the CS pin during each cycle and helps minimize filter
capacitor values and current sense delay.
The UCC38083 and the UCC38084 devices have a
typical soft-start interval time of 3.5 ms while the
UCC38085 and the UCC38086 has less than 100 µs for
applications where internal soft-start is not desired.
The UCC38083 and the UCC38085 devices have the
turn-on/off thresholds of 12.5 V / 8.3 V, while the
UCC38084 and the UCC38086 has the turn-on/off
thresholds of 4.3 V / 4.1 V. Each device is offered in 8-pin
TSSOP (PW), 8-pin SOIC (D) and 8-pin PDIP (P)