Product Summary

The UC3843BD1TR-2LF is a high performance 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 UC3843BD1TR-2LF include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lock out featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, the UC3843BD1TR-2LF also provides current limit control, and a totem pole output stage designed to source or sink high peakcurrent.

Parametrics

UC3843BD1TR-2LF 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 5.5 V; (5)Error Amplifier Output Sink Current: 10 mA; (6)Ptot Power Dissipation at Tamb ≤ 25 ℃ (Minidip) 1.25 W; (7)Ptot Power Dissipation at Tamb ≤ 25 ℃ (SO8): 800 mW; (8)Tstg Storage Temperature Range: -65 to 150 ℃; (9)TJ Junction Operating Temperature: -40 to 150 ℃; (10)TL Lead Temperature (soldering 10s): 300 ℃.

Features

UC3843BD1TR-2LF features: (1)trimmed oscillator for precise frequency control; (2)oscillator frequency guaranteed at 250khz; (3)current mode operation to 500khz; (4)automatic feed forward compensation; (5)latching pwm for cycle-by-cycle current limiting; (6)internally trimmed reference with undervoltage lockout; (7)high current totem pole output; (8)undervoltage lockout with hysteresis; (9)low start-up and operating current.

Diagrams

UC3843BD1TR-2LF diagram block

UC3803X
UC3803X

Other


Data Sheet

Negotiable 
UC3823
UC3823

Other


Data Sheet

Negotiable 
UC3823A
UC3823A

Other


Data Sheet

Negotiable 
UC3823ADW
UC3823ADW

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $8.53
1-25: $8.15
25-100: $6.13
100-250: $6.00
UC3823ADWG4
UC3823ADWG4

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $8.53
1-25: $7.50
25-100: $6.13
100-250: $6.00
UC3823ADWTR
UC3823ADWTR

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1539: $4.76
1539-2000: $4.61