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APPLICATION INFORMATION

R

3 V

(10 mA)

C

1.6

D

MAX

R

T

f

(1)

CLK

LEB

IC = IR

IR

R

T

C

T

ID = 10 mA

V

TH

R

C

3 V

1 k

10 k

70

75

80

85

90

95

100

100 k

MAXIMUM DUTY CYCLE

vs

TIMING RESISTANCE

W

10 M

1 M

100 k

10 k

1 k

10 k

100 k

OSCILLATOR FREQUENCY

vs

TIMING RESISTANCE

UC2825A-Q1

SLUS781 – SEPTEMBER 2007

The oscillator is a sawtooth. The rising edge is governed by a current controlled by the RT pin and value of

should be done first, based on desired maximum duty cycle. CT can then be chosen based on the desired

Figure 1. Oscillator

Figure 2.

Figure 3.

6

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