UC184xA / 284xA / 384xA
CURRENT MODE PWM CONTROLLER
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DESCRIPTION The UC184xA family of control ICs provides externally programmable oscillator to set all the necessary features to implement off-line frequency and maximum duty cycle. The fixed-frequency, current-mode switching power undervoltage lock-out is designed to operate with supplies with a minimum of external 250µA typ. start-up current, allowing an efficient components. The current mode architecture bootstrap supply voltage design. Available demonstrates improved load regulation, pulse- options for this family of products, such as startby-pulse current limiting and inherent protection up voltage hysteresis and duty cycle, are of the power supply output switch. The IC summarized below in the Available Options includes: A bandgap reference trimmed to ±1% section. The UC184xA family of control ICs is accuracy, an error amplifier, a current sense also available in 14-pin SOIC package which comparator with internal clamp to 1V, a high makes the Power Output Stage Collector and current totem pole output stage for fast Ground pins available. switching of power MOSFET's, and an
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
LOW START-UP CURRENT. (0.5mA max.) TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. AUTOMATIC FEED FORWARD COMPENSATION. PULSE-BY-PULSE CURRENT LIMITING. ENHANCED LOAD RESPONSE CHARACTERISTICS. UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. DOUBLE PULSE SUPPRESSION. HIGH-CURRENT TOTEM POLE OUTPUT. INTERNALLY TRIMMED BANDGAP REFERENCE. 500KHz OPERATION. LOW RO ERROR AMPLIFIER.
PRODUCT HIGHLIGHT
COMPARISON O F U C384XA
SG384x
Min. Limit
V S.
SG384 X DISCHARGECURRENT
SG384x
Max. Limit
UC384xA
TA=25 C
KEY FEATURES
ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. DC-DC BUCK OR BOOST CONVERTERS. LOW COST DC MOTOR CONTROL.
7.5
7.8
-3 s
8.3 Mean
8.8
9.3
+3s
Available Options
Part# UCx842A UCx843A UCx844A UCx845A Start-Up Voltage 16V 8.4V 16V 8.4A Hysteresis 6V 0.8V 6V 0.8V Max. Duty Cycle
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