AS3676 datasheet(12/92 Pages) AMSCO

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AS3676

Datasheet - D e ta i l e d D e s c r i p t i o n

8.2

Step Up DC/DC Converter

The Step Up DC/DC Converter is a high-efficiency current mode PWM regulator, providing output voltage up to e.g.

25V/50mA

1. A constant switching-frequency results in a low noise on the supply and output voltages.

Figure 11. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection

1. The AS3676 internal driver structure allows output voltage higher than 25V. The Over voltage Protection in

Current Feedback Mode (see page 13) or Voltage Feedback (see page 14) should be set to fit to the exter-

nal components used (maximum voltage rating of Q1, C9 and D1).

Table 8. Step Up DC/DC Converter Parameters

Symbol

Parameter

Condition

Min

Typ

Max

Unit

IVDD

Quiescent Current

Pulse skipping mode.

140

µA

VFB1

Feedback Voltage for

External Resistor

Divider

For constant voltage control.

step_up_res = 1

1.20

1.25

1.30

VFB2

Feedback Voltage for

Current Sink

Regulation

on CURR1, CURR2 or CURR6 in regulation.

step_up_res = 0

0.4

0.5

0.6

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