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UCC28C40 Datasheet(PDF) 5 Page - Texas Instruments

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Part No. UCC28C40
Description  BICMOS LOW POWER CURRENT MODE PWM CONTROLLER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28C40 Datasheet(HTML) 5 Page - Texas Instruments

 
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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458C − AUGUST 2001 − REVISED SEPTEMBER 2003
5
www.ti.com
pin assignments
COMP: This pin provides the output of the error amplifier for compensation. In addition, the COMP pin is
frequently used as a control port by utilizing a secondary-side error amplifier to send an error signal across the
secondary-primary isolation boundary through an opto-isolator.
CS: The current sense pin is the non-inverting input to the PWM comparator. This is compared to a signal
proportional to the error amplifier output voltage. A voltage ramp can be applied to this pin to run the device with
a voltage mode control configuration.
FB: This pin is the inverting input to the error amplifier. The non-inverting input to the error amplifier is internally
trimmed to 2.5 V
±1%.
GND: Ground return pin for the output driver stage and the logic level controller section.
OUT: The output of the on-chip drive stage. OUT is intended to directly drive a MOSFET. The OUT pin in the
UCC38C40, UCC38C42 and UCC38C43 is the same frequency as the oscillator, and can operate near 100%
duty cycle. In the UCC38C41, UCC38C44 and the UCC38C45, the frequency of OUT is one-half that of the
oscillator due to an internal T flipflop. This limits the maximum duty cycle to < 50%.
RT/CT: Timing resistor and timing capacitor. The timing capacitor should be connected to the device ground
using minimal trace length.
VDD: Power supply pin for the device. This pin should be bypassed with a 0.1-
µF capacitor with minimal trace
lengths. Additional capacitance may be needed to provide hold up power to the device during startup.
VREF: 5-V reference. For stability, the reference should be bypassed with a 0.1-
µF capacitor to ground using
the minimal trace length possible.


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