MAX15059 데이터 시트보기 (PDF) - Maxim Integrated

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MAX15059

76V, 300mW Boost Converter and Current Monitor for APD Bias Applications

Maxim Integrated 

PIN

12

13

14, 15

—

76V, 300mW Boost Converter and Current

Monitor for APD Bias Applications

NAME

APD

BIAS

LX

EP

Pin Description (continued)

FUNCTION

Reference Current Output. APD provides the source current to the cathode of the photodiode.

Bias-Voltage Input. Connect BIAS to the boost converter output (VOUT) either directly or through a

lowpass filter for ripple attenuation. BIAS provides the voltage bias for the current monitor and is the

current source for APD.

Drain of Internal 80V n-Channel DMOS. Connect inductor to LX. Minimize the trace area at LX to reduce

switching-noise emission.

Exposed Pad. Connect to a large copper plane at the SGND and PGND potential to improve thermal

dissipation. Do not use as the only ground connection.

Functional Diagram

FB

-A

VREF

CNTRL

MUX +A

SGND

-C

+C

VREF

REFERENCE

COMPARATOR

OUTPUT ERROR

AND CURRENT COMPARATOR

SOFT-

START

PEAK

CURRENT-LIMIT

COMPARATOR

SWITCH

CONTROL

LOGIC

VREF

80V

DMOS

SWITCH

CURRENT

SENSE

BIAS

THERMAL

1X

AND REF

SHUTDOWN

IN

UVLO

CONTROL

MONITOR

CURRENT-

LIMIT

ADJUSTMENT

CLK

OSCILLATOR

400kHz

MAX15059

1X (A)

5X (B)

CURRENT

LIMIT

LX

PGND

CLAMP

MOUT

RLIM

APD

ILIM

SHDN

BIAS

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