UC2843AQ

Operating Supply Current :
Number of Outputs : 1
Mounting Style : SMD/SMT
Operating Supply Voltage : 30 V
Switching Frequency : 500 KHz
Maximum Operating Temperature : + 85 C
Rise Time : 50 ns
Duty Cycle (Max) : 100 %
Fall Time : 50 ns
Package / Case : PLCC-20


Features:

` Extended Temperature Performance of 40°C to 125°C
` Optimized for Off-line and DC to DC Converters
` Low Start Up Current (<0.5 mA)
` Trimmed Oscillator Discharge Current
` 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
` 500 kHz Operation
` Low RO Error Amp


Pinout




Specifications

V_CC voltage (low impedance source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 V
V_CC voltage (I_CC mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . self limiting
Output current, I_O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 A
Output energy (capacitive load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . 5 J
Analog Inputs (pins 3, 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 6.3 V
Error Amp Output Sink current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Power Dissipation at T_A < +25 (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . .  1 W
Package thermal impedance, _JA (see Note 1): D (8-pin) package . . . . . . . . 97°C/W
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to 150
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . 260

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
‡ Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.
NOTE 1: Long term hightemperature storage and/or extended use at maximum recommended operating conditions may result in a reduction ofoverall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.

Description

The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The difference between members of this family are shown in the table below.

Parameters:

Technical/Catalog Information	UC2843AQ
Vendor	Texas Instruments
Category	Integrated Circuits (ICs)
PWM Type	Current Mode
Number of Outputs	1
Package / Case	*
Packaging	*
Duty Cycle	100%
Voltage - Supply	12 V ~ 30 V
Frequency-Max	500kHz
Buck	No
Boost	Yes
Flyback	No
Inverting	No
Doubler	No
Divider	No
Cuk	No
Isolated	No
Drawing Number	*
Operating Temperature	-40°C ~ 125°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	UC2843AQ UC2843AQ