2 Stk. UC3842 : “HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER” von “ST”

EUR 4,49 Sofort-Kaufen oder Preisvorschlag, Kostenloser Versand, eBay-Käuferschutz
Verkäufer: mohajer ✉️ (2.466) 99%, Artikelstandort: NRW, DE, Versand nach: DE, Artikelnummer: 256391890600 2 Stk. UC3842 : “HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER” von “ST”.

2 Stück “HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER”-Bausteine vom Typ UC3842 von renommierten Hersteller “ST-Electronics ”. Die ICs werden in der Schaltnetzteile als Kontroller eingesetzt.

 

Auszuge aus dem Datenblatt:

 

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

 

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.

 

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

Tstg

Storage Temperature Range

– 65 to 150

 C

TJ

Junction Operating Temperature

– 40 to 150

°C

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

 

N° Pin Function

1 COMP:  This pin is the Error Amplifier output and is made available for loop compensation.

2 VFB:      This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider.

3 ISENSE:   A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction.

4 RT/CT:   The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. Operation to 500kHz is possible.

5 GROUND:    This pin is the combined control circuitry and power ground.

6 OUTPUT:     This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sunk by this pin.

7 VCC:            This pin is the positive supply of the control IC.

8 Vref:     This is the reference output. It provides charging current for capacitor CT through resistor RT.

Die ICs sind neu und unbenutzt.

Privatverkauf: keine Garantie oder Rücknahme möglich.

  • Condition: Neu
  • Produktart: PWM Switch
  • Maximaler Eingangsstrom: 1 A
  • Anzahl der Pins: 8
  • Herstellernummer: UC3842
  • Marke: ST
  • Maximale Betriebstemperatur: 70 °C
  • Maximale Betriebsspannung: 30 V
  • Montageart: Durchsteckmontage
  • Pinanzahl: 8
  • Gehäusematerial: Epoxid
  • Serie: UC3842
  • Gehäusegröße: 8-Pin DIL
  • Minimale Betriebstemperatur: 0 °C

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