UC3845 datasheet(4/11 Pages) STMICROELECTRONICS

4 / 11 page

Notes :

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 :

∆ 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.

ELECTRICAL CHARACTERISTICS (continued)

Symbo l

Parameter

T est Cond ition s

UC284X

UC384X

Unit

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

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold

X842/4

14.5

17.5

X843/5

7.8

8.4

9.0

7.8

8.4

Min Operating Voltage

After Turn-on

X842/4

8.5

11.5

X843/5

7.0

7.6

8.2

7.0

7.6

8.2

PWM SECTION

Maximum Duty Cycle

X842/3

100

X844/5

Minimum Duty Cycle

TOTAL STANDBY CURRENT

Ist

Start-up Current

0.5

Operating Supply Current

VPIN2 =VPIN3 =0V

Viz

Zener Voltage

Ii = 25mA

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

4/11

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