(Hong Kong)
Product Summary
The UC3843AN is a SMPS controller. The UC3843AN control IC provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuit of the UC3843AN includes a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator of the UC3843AN which also provides current limit control, and a totem pole output stage designed to source or sink high peak current.
Parametrics
UC3843AN absolute maximum ratings: (1)Vi Supply Voltage (low impedance source): 30 V; (2)Vi Supply Voltage (Ii < 30mA): Self Limiting; (3)IO Output Current: ±1 A; (4)EO Output Energy (capacitive load): 5 mJ; (5)Analog Inputs (pins 2, 3) – 0.3 to 5.5 V; (6)Error Amplifier Output Sink Current: 10 mA; (7)Ptot Power Dissipation at Tamb ≤ 25 ℃ (Minidip): 1.25 W; (8)Ptot Power Dissipation at Tamb ≤ 25 ℃ (SO8): 800 mW; (9)Tstg Storage Temperature Range: – 65 to 150 ℃; (10)TJ Junction Operating Temperature: – 40 to 150 ℃; (11)TL Lead Temperature (soldering 10s): 300 ℃.
Features
UC3843AN features: (1)Trimmed oscillator discharge current; (2)Current mode operation to 500kHz; (3)Automatic feed forward compensation; (4)Latching pwm for cycle-by-cycle current limiting; (5)Internally trimmed reference with undervoltage lockout; (6)High current totem pole output; (7)Undervoltage lockout with hysteresis; (8)Low start-up current (< 0.5mA); (9)Double pulse suppression.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 UC3843AN2 |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843AN2G |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
Negotiable |
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|
UC3843ANG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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|
UC3843ANG |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
Negotiable |
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|
UC3843AN |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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