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UC3824

Texas Instruments
Part Number UC3824
Manufacturer Texas Instruments
Description HIGH SPEED PWM CONTROLLER
Published Oct 1, 2019
Detailed Description www.ti.com UC1824 UC2824 UC3824 SLUS326A – MARCH 1997 – REVISED JULY 2007 HIGH SPEED PWM CONTROLLER FEATURES • Complem...
Datasheet PDF File UC3824 PDF File

UC3824
UC3824

Overview
www.
ti.
com UC1824 UC2824 UC3824 SLUS326A – MARCH 1997 – REVISED JULY 2007 HIGH SPEED PWM CONTROLLER FEATURES • Complementary Outputs • Practical Operation Switching Frequencies to 1 MHz • 50-ns Propagation Delay to Output • High Current Dual Totem Pole Outputs (1.
5 A Peak) • Wide Bandwidth Error Amplifier • Fully Latched Logic With Double Pulse Suppression • Pulse-by-Pulse Current Limiting • Soft Start/Maximum Duty Cycle Control • Under-Voltage Lockout with Hysteresis • Low Start Up Current (1.
1 mA) • Trimmed Bandgap Reference (5.
1 V ± 1%) DESCRIPTION The UC1824 family of PWM control devices is optimized for high frequency switched mode power supply applications.
Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier.
This controller is designed for use in either current mode or voltage mode systems with the capability for input voltage feed-forward.
Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles as a maximum duty cycle clamp.
The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output.
An under-voltage lockout section with 800 mV of hysteresis assures low start up current.
During under-voltage lockout, the outputs are high impedance.
BLOCK DIAGRAM Clock 4 RT 5 CT 6 Ramp 7 1.
25V + OSC E/A Out 3 Error Amp NI 2 INV 1 Wide Bandwidth (Set Dom.
) + Inhibit PWM Latch (Set Dom.
) R S VIN 9mA Soft Start 8 ILIM/SD 9 1V 1.
4V ILIM CPRTR Shutdown CPRTR VCC 15 9V Gnd 10 UVLO VCC Good GATE REF GEN Internal Bias 4V 13 VC 11 Out 14 INVOUT 12 Pwr Gnd Output Inhibit VREF Good 10 VREF 5.
1V Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data she...


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