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UCC3829DW-1 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3829DW-1 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page SLUS390 - MARCH 1998 FEATURES • Compatible with Voltage or Current Mode Control Methods • Practical Operation at Switching Frequencies to 4MHz • 50ns Propagation Delay to Output • High Current Complementary Outputs • Programmable Dead Time and Frequency Oscillator • Pulse by Pulse Current Limiting • Latched Overcurrent Comparator with Full Cycle Restart • Programmable Undervoltage Lockout (UVLO) • Adjustable Blanking for Leading Edge Noise Tolerance High Speed PWM Controller UDG-98043 UCC1829-1/-2/-3 UCC2829-1/-2/-3 UCC3829-1/-2/-3 PRELIMINARY DESCRIPTION The UCC3829 is a BiCMOS High Speed PWM Controller IC. It is opti- mized for high frequency switched mode power supply applications. The IC can be used in both voltage mode and current mode control applica- tions. Care was given to minimizing the propagation delays through the comparators and logic circuitry while maximizing the bandwidth and slew rate of the error amplifier. The oscillator frequency and deadtime can be programmed via two external resistors and a capacitor. The undervolt- age lockout threshold can be programmed using an external resistor di- vider. The current limit and overcurrent threshold can be set externally. The IC is available in push-pull (-1), single ended (-2), or complementary (-3) output configuration. Fault protection circuitry includes undervoltage detection for the internal bias supply, and overcurrent detection. The fault detection logic sets a latch that ensures full discharge of the soft start capacitor before allowing a restart. While the fault latch is set, the outputs are in a low state. In the event of continuous faults, the soft start capacitor is fully charged before discharging to insure that the fault frequency does not exceed the de- signed soft start period. 15 13 18 14 18 VDD PGND OUTA OUTB GND 10 SS S R D Q Q 1V 2 INV 1 NINV V BIAS 3 EAOUT 5 RAMP 4 19 LEB 1.5V 1.2V 4V 6 RT2 7 CT CLOCK V BIAS 8 RT1 9 BISYNC S R Q Q T > Q Q V BIAS 1.25V 0.9V 3V REFERENCE 11 23 17 VREF CL– UVLO 2.1V 3V/2.5V 14.2V/9V 12 CL+ PWCONT BLOCK DIAGRAM |
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