AS3675 datasheet(12/81 Pages) AMSCO

номер детали	AS3675

подробное описание детали	Flexible Lighting Management Unit

PDF	81 Pages

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производитель	AMSCO [ams AG]

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AS3675

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/35mA or e.g. 16V/55mA. A constant switching-frequency results in a low noise on the supply and output voltages.

Figure 12. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection

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

IDCDC_FB

Additional Tuning

Current at Pin

DCDC_FB and over

voltage protection

Adjustable by software using Register DCDC

control1

1µA step size (0-31µA)

VPROTECT = 1.25V +

IDCDC_FB * R2

031

µA

Accuracy of Feedback

Current at full scale

-6

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AS3675

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