UCC25705, UCC25706, UCC35705, UCC35706

HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR

SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001

9

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FUNCTIONAL DESCRIPTION

component selection for oscillator without duty cycle clamp (MODE = 0)

For a power converter with the following specifications:

With these specifications,

V

18

15

+ 1.2 V

R

V

IN(min)

V

FF(min)

1

F

OSC

* 75 ns

C

T

TYPICAL CHARACTERISTICS

Figure 4

–50

–25

0

25

50

75

100

125

Temperature

8.0

8.1

8.2

8.3

8.4

8.5

8.6

8.7

8.8

8.9

UCC35705 UVLO THRESHOLDS

vs

TEMPERATURE

C

Figure 5

–50

–25

0

25

50

75

100

125

Temperature

7

8

9

10

11

12

13

C

UCC35706 UVLO THRESHOLDS

vs

TEMPERATURE