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Part Number: 384xA
Description: The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency,current-mod...
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384xA
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DataSheet
General Description
384xA General Description
The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency,current-mode switching power supplies with a minimum of external compo-
nents. The current mode architecture demonstrates improved load regulation,pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A
bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power
MOSFET's, and an externally program-mable oscillator to set frequency and maximum duty cycle. The under-voltage lock-out is designed to operate with 250µA typ. start-up current,allowing an efficient bootstrap supply oltage design. Available options for this family of products, such as start-up voltage hysteresis and duty cycle, are summarized below in the Available Options section. The UC184xA family of control ICs is also available in 14-pin SOIC package which makes the Power Output Stage Collector and Ground pinsavailable.
384xA Maximum Ratings
Supply Voltage (Low Impedance Source) (VCC) ............................................................ 30V
Supply Voltage (ICC < 30mA) .......................................................................... Self Limiting
Output Current ........................................................................................................... ±1A
Output Energy (Capacitive Load) ................................................................................. 5µJ
Analog Inputs (VFB & ISENSE) ........................................................................ -0.3V to +6.3V
Error Amp Output Sink Current ................................................................................... 10mA
Power Dissipation at TA = 25°C (M Package) ................................................................ 1W
Storage Temperature Range .................................................................. -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
Supply Voltage (ICC < 30mA) .......................................................................... Self Limiting
Output Current ........................................................................................................... ±1A
Output Energy (Capacitive Load) ................................................................................. 5µJ
Analog Inputs (VFB & ISENSE) ........................................................................ -0.3V to +6.3V
Error Amp Output Sink Current ................................................................................... 10mA
Power Dissipation at TA = 25°C (M Package) ................................................................ 1W
Storage Temperature Range .................................................................. -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
384xA 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.
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.
384xA Typical Application
n n n n ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS.
DC-DC BUCK OR BOOST CONVERTERS.
LOW COST DC MOTOR CONTROL.
DC-DC BUCK OR BOOST CONVERTERS.
LOW COST DC MOTOR CONTROL.
384xA Connection Diagram
3841
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