(China (Mainland))
Product Summary
The UC3843 is a current mode pwm controller. It 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 circuits of the UC3843 include under voltage lock out featuring start-up current less than 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, the UC3843 also provides current limit control, and a totem pole output stage designed to source or sink high peakcurrent.
Parametrics
UC3843 absolute maximum ratings: (1)Vi Supply Voltage (low impedance source): 30 V; (2)IO Output Current: ±1 A; (3)EO Output Energy (capacitive load): 5 mJ; (4)Analog Inputs (pins 2, 3): -0.3 to 6.3 V; (5)Error Amplifier Output Sink Current: 10 mA; (6)Ptot Power Dissipation at Tamb ≤ 50 ℃ (minidip, DIP-14): 1 W; (7)Ptot Power Dissipation at Tamb ≤ 25 ℃ (SO14): 725 mW; (8)Tstg Storage Temperature Range: -65 to 150 ℃; (9)TL Lead Temperature (soldering 10s): 300 ℃.
Features
UC3843 features: (1)optimized for off-line and dc to dc converters; (2)lowstart-up current (< 1 ma); (3)automatic feed forward compensation; (4)pulse-by-pulsecurrent limiting; (5)enhanced load response characteristics; (6)under-voltage lockout with hysteresis; (7)double pulse suppression; (8)high current totem pole output; (9)internally trimmed bandgap reference; (10)500 khz operation; (11)low Ro erroramp.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||||||||||||
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 UC3843AD |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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UC3843AD1 |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843AD1R2 |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM |
Data Sheet |
Negotiable |
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UC3843AD8 |
Texas Instruments |
Current Mode PWM Controllers Current Mode |
Data Sheet |
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UC3843AD8TRG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC3843ADG |
ON Semiconductor |
Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max |
Data Sheet |
Negotiable |
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UC3843ADG4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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UC3843ADM |
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IC REG CTRLR BST FLYBK ISO 8SOIC |
Data Sheet |
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