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New & Original High Performance Current Mode Pwm Controller UC3844AN

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New & Original High Performance Current Mode Pwm Controller UC3844AN

Model Number UC3844AN
Certification new & original
Place of Origin original factory
Minimum Order Quantity 10pcs
Price Negotiate
Payment Terms T/T, Western Union, Paypal
Supply Ability 4200pcs
Delivery Time 1 day
Packaging Details please contact me for details
Description Power Supply Controller PWM Controller 8-PDIP
Supply Voltage (low impedance source) 30 V
Output Current ±1 A
Output Energy (capacitive load) 5 µJ
Error Amplifier Output Sink Current 10 mA
Storage Temperature Range – 65 to 150 °C
Junction Operating Temperature – 40 to 150 °C
Detailed Product Description

 

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

 

FEATURES

■ TRIMMED OSCILLATOR DISCHARGE CURRENT

■ CURRENT MODE OPERATION TO 500kHz AUTOMATIC FEED FORWARD COMPENSATION

■ LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING

■ INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT

■ HIGH CURRENT TOTEM POLE OUTPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS

■ LOW START-UP CURRENT (< 0.5mA) DOUBLE PULSE SUPPRESSION

 

Figure 1. Package                                              Table 1. Order Codes

                                           

 

     Part Number        Package

  UC2842AD1; UC3842AD1;

  UC2843AD1; UC3843AD1;

  UC2844AD1; UC3844AD1;

  UC2845AD1; UC3845AD1

           SO-8

  UC2842AN; UC3842AN;

  UC2843AN; UC3843AN;  

  UC2844AN; UC3844AN;

  UC2845AN; UC3845AN

           DIP-8

 

DESCRIPTION

The UC384xA family of control ICs 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 include 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 which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.

 

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.5 V and 7.9V. The UC3842A and UC3843A can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

 

Figure 2. Block Diagram (toggle flip flop used only in UC3844A and UC3845A)

 

 

Table 2. Absolute Maximum Ratings

  Symbol                 Parameter    Value   Unit
    Vi  Supply Voltage (low impedance source)       30    V
    Vi  Supply Voltage (Ii < 30mA)    Self Limiting 
    IO  Output Current       ±1    A
    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
    Ptot  Power Dissipation at Tamb ≤ 25 °C (DIP-8)      1.25    W
    Ptot  Power Dissipation at Tamb ≤ 25 °C (SO-8)       800    mW
    Tstg  Storage Temperature Range    – 65 to 150     °C
    TJ  Junction Operating Temperature    – 40 to 150     °C
    TL  Lead Temperature (soldering 10s)       300     °C

* All voltages are with respect to pin 5, all currents are positive into the specified terminal.

 

 

 

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