AS3715 datasheet(34/159 Pages) AMSOSRAM

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ams Datasheet

Page 33

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – Power Management Functions

Figure 35:

DCDC Step-Up Converter

DCDC Step-Up Converter Block Diagram: Shows the internal structure of the DCDC boost controller including

external components.

ov_curr

Gate

Driver

PWM

Logic

HV Current Sinks

Each 0.156-39.8mA

Automatic

feedback select

(CURR 1,2,3)

Optional; only requir ed

if CURR3 can

exceed 30V

clk

1 MHz

50 0 kHz

stepu p12_clkinv

stpup2_on

vov_curren t

overshoot comp

err o ta

stepu p2_fb

1.25 V

0.8 V

1.25 V

0.5 V

1.4 V

VSUP

currX_ctrl = '10'

CURR1

CURR2

CURR3

LEDs as required

by th e app lication

FB_SU

GATE_SU

SENSEN_SU

SENSEP_SU

RSU2

0.15

+/- 5%

LSU2

10μH; SD12-100 Coiltronics

DSU2

PMEG2010

QSU2

Si1304

CSU2_IN

2.2μF

CSU2_OUT2

2.2μF/25V

curren t sense

setpu p2_v

step2_prot

VSUPPLY

ramp

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