UC3842 Просмотр технического описания (PDF) - STMicroelectronics

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Компоненты Описание

производитель

UC3842

CURRENT MODE PWM CONTROLLER

STMicroelectronics 

UC2842/3/4/5-UC3842/3/4/5

ELECTRICAL CHARACTERISTICS (continued)

Symbo l

Ist

Ii

Viz

Parameter

Test Conditions

UC284X

UC384X

Unit

Min. T yp. Max. Min. T yp. Max.

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold

X842/4

15 16 17 14.5 16 17.5 V

X843/5

7.8 8.4 9.0 7.8 8.4 9

V

Min Operating Voltage

After Turn-on

X842/4

X843/5

9 10 11 8.5 10 11.5 V

7.0 7.6 8.2 7.0 7.6 8.2 V

PWM SECTION

Maximum Duty Cycle

X842/3

93 97 100 93 97 100 %

X844/5

46 48 50 47 48 50 %

Minimum Duty Cycle

0

0%

TOTAL STANDBY CURRENT

Start-up Current

0.5 1

0.5 1 mA

Operating Supply Current

Zener Voltage

VPIN2 = VPIN3 = 0V

Ii = 25mA

11 20

34

11 20 mA

34

V

N otes :

2. These parameters, although guaranteed, are not 100% tested in production.

3. Parameter measured at trip point of latch with VPIN2 = 0.

4. Gain defined as :

A = ∆ VPIN1 ; 0 ≤ VPIN3 ≤ 0.8 V

∆ VPIN3

5. Adjust Vi above the start threshold before setting at 15 V.

6. Output frequency equals oscillator frequency for the UC3842 and UC3843.

Output frequency is one half oscillator frequency for the UC3844 and UC3845.

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