STLD20D-DEF datasheet(6/8 Pages) STMICROELECTRONICS

6 / 8 page

STLD20D

6/8

7. OVER VOLTAGE PROTECTION (OVP):

In case of failure and if the LED branch is cut, then there is no signal at the feedback pin FB (

figure 1), the

PWM controller will then switches with a maximum duty cycle. This will generate a voltage at the pin SW

and VOUT that can exceed the maximum rating of the device. The overvoltage protection bloc senses the

output voltage at the pin VOUT (figure 1). If the voltage exceeds 18.5Vdc typical the controller is automat-

ically turned OFF. When the voltage is reduced of 0.7V, the operation of the device automatically recovers.

8. EFFICIENCY (

Figure 1 & 2)

The efficiency takes into account these following losses:

■ RLED ohmic losses

■ Boost switch SW losses

■ LED disconnect switch LDS

■ Boost inductor losses

■ Boost diode losses

■ Total driver consumption.

Figure 8: SOT23-8L Package Mechanical Data

GAUGE PLANE

SEATING PLANE

0.25

REF.

DIMENSIONS

Millimeters

Inches

Min.

Max.

Min.

Max.

A1.45

0.057

0.15

0.006

0.90

1.30

0.035

0.051

0.22

0.38

0.008

0.015

0.08

0.22

0.003

0.008

2.80

0.110

0.118

2.60

1.102

0.118

1.50

1.75

0.059

0.069

0.65 typ.

0.026 typ.

1.95 typ.

0.077 typ.

0.30

0.60

0.012

0.024

0°8°0°8°

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