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Part Number: UC1845A
Description: The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Pro...
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UC1845A
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DataSheet
General Description
UC1845A General Description
The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 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 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.
The difference between members of this family are shown in the table below.
UC1845A Maximum Ratings
Supply Voltage (Low Impedance Source) . . . . . . . . . . . . . . 30V
Supply Voltage (ICC mA). . . . . . . . . . . . . . . . . . . . . Self Limiting
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1A
Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . 5J
Analog Inputs (Pins 2, 3) . . . . . . . . . . . . . . . . . . -0.3V to +6.3V
Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . 10mA
Power Dissipation at TA 25°C (DIL-8) . . . . . . . . . . . . . . . . 1W
Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
Note 1. All voltages are with respect to Ground, Pin 5. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. Pin numbers refer to DIL package only.
Supply Voltage (ICC mA). . . . . . . . . . . . . . . . . . . . . Self Limiting
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1A
Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . 5J
Analog Inputs (Pins 2, 3) . . . . . . . . . . . . . . . . . . -0.3V to +6.3V
Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . 10mA
Power Dissipation at TA 25°C (DIL-8) . . . . . . . . . . . . . . . . 1W
Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
Note 1. All voltages are with respect to Ground, Pin 5. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. Pin numbers refer to DIL package only.
UC1845A Features
· Optimized for Off-line and DC to DC Converters
· Low Start Up Current (<0.5mA)
· 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
· 500kHz Operation
· Low RO Error Amp
· Low Start Up Current (<0.5mA)
· 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
· 500kHz Operation
· Low RO Error Amp
UC1845A Connection Diagram
UC1845A
PDF/DataSheet Download
- Datasheet: UC1845A
- File Size: 676878 KB
- Manufacturer: TI [Texas Instruments]
- Click here to Download
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