Product Summary

The UC2844BN-2LF 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.

Parametrics

UC2844BN-2LF 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 μJ; Analog Inputs (pins 2, 3): –0.3 to 5.5 V; Error Amplifier Output Sink Current: 10 mA; (5)Ptot, Power Dissipation at Tamb 3 25 ℃ (Minidip): 1.25 W; (6)Ptot, Power Dissipation at Tamb 3 25℃ (SO8): 800 mW; (7)Tstg, Storage Temperature Range: –65 to 150℃; (8)TJ, Junction Operating Temperature: – 40 to 150 ℃; (9)TL, Lead Temperature (soldering 10s): 300 ℃.

Features

UC2844BN-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 totempoleoutput ; (8)undervoltage lockout with hyster esis ; (9)lowstart-upandoperatingcurrent.

Diagrams

UC28023DW
UC28023DW
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1: $2.77
1-25: $1.96
25-100: $1.78
100-250: $1.55
UC28023DWG4
UC28023DWG4
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1: $2.47
1-25: $2.03
25-100: $1.78
100-250: $1.55
UC28023DWR
UC28023DWR
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1490: $1.09
1490-2000: $1.06
2000-5000: $1.01
UC28023DWRG4
UC28023DWRG4
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1490: $1.09
1490-2000: $1.06
2000-5000: $1.01
UC28023N
UC28023N
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1: $2.47
1-25: $2.03
25-100: $1.78
100-250: $1.55
UC28023NG4
UC28023NG4
Texas Instruments
Current Mode PWM Controllers Economy High Speed
Data Sheet
0-1: $2.47
1-25: $2.03
25-100: $1.78
100-250: $1.55