L6668TR datasheet(9/23 Pages) STMICROELECTRONICS

9 / 23 page

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L6668

Figure 17. Oscillator frequency vs. Tj

Figure 18. Oscillator ramp vs. Tj

Figure 19. Current sense clamp vs. Tj

Figure 20. Disable level on current sense vs. Tj

Figure 21. Reference voltage vs. Tj

Figure 22. PFC_STOP open/low thresholds on

VCOMP vs. Tj

Tj (°C)

-50

100

150

99%

99.5%

100%

100.5%

101%

101.5%

102%

RT = 13.3 k

Ω

CT = 1 nF

fsw

Vcc = 9.4V

Vcc = 22V

Vcc = 15V

Values normalized to fsw @ Tj=25°C, Vcc=15V

Tj (°C)

Vpin14

(V)

-50

100

150

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Vcc = 15 V

Peak

Valley

Tj (°C)

V ISENx (pin 12)

(V)

-50

100

150

0.6

0.7

0.8

0.9

Vcc = 15 V

VCOMP= Upper clamp

Tj (°C)

Vpin12

(V)

-50

100

150

1.0

1.2

1.4

1.6

1.8

2.0

Vcc = 15 V

Tj (°C)

VREF

(V)

-50

100

150

4.9

4.95

5.05

5.1

Vcc = 15 V

(pin 8)

Tj (°C)

VCOMP

(V)

-50

100

150

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

Vcc = 15 V

(pin 10)

PFC_STOP low (voltage rising)

PFC_STOP open (voltage falling)

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