Rainbow-electronics MAX1567 Manual de usuario descargar pdf (Pagina 23)

MAX1566/MAX1567

Six-Channel, High-Efficiency, Digital

Camera Power Supplies

______________________________________________________________________________________ 23

SDOK pulls low when the step-down has successfully

completed soft-start. SDOK goes high impedance in

shutdown, overload, and thermal limit. A typical use for

SDOK is to drive a P-channel MOSFET that connects

3.3V power to the CPU I/O after the CPU core is pow-

ered up (Figure 15), thus providing safe sequencing in

hardware without system intervention.

AAUUXX11OOKK

pulls low when the AUX1 controller has suc-

cessfully completed soft-start. AUX1OK goes high

impedance in shutdown, overload, and thermal limit. A

typical use for AUX1OK is to drive a P-channel MOSFET

that connects 5V power to the CCD after the 15V CCD

bias (generated by AUX1) is powered up (Figure 16).

SCF goes high (high impedance, open drain) when

overload protection occurs. Under normal operation,

SCF pulls low. SCF can drive a high-side P-channel

MOSFET switch that can disconnect a load during

power-up or when a channel turns off in response to a

logic command or an overload. Several connections

are possible for SCF. One is shown in Figure 17 where

SCF provides load disconnect for the step-up on fault

and power-up.

DL2

FB2

REF

AUX2

INVERTING

PWM

INDL2

-7.5V

100mA

TO V

BATT

TOP

REF

MAX1567

(PARTIAL)

Figure 10. Regulated -7.5V Negative CCD (Bias is provided by

conventional inverter (works only with the MAX1567).)

MAX1566

MAX1567

(PARTIAL)

AUX_

PWM

PVSU

DL_

FB_

1µF

TO V

BATT

1µF

10µH

1MΩ

90.9kΩ

1µF

OUT+

+15V

20mA

OUT-

-15V

10mA

Figure 11. ±15V Output Using an AUX-Driven Boost with

Charge-Pump Inversion

MAX1566/MAX1567

(PARTIAL)

AUX_

PWM

PVSU

DL_

FB_

TO V

BATT

MAX1616

FB_

GND

SHDNIN

OUT

+1.25V

+15V

20mA

-7.5V

20mA

NOTE: THIS CIRCUIT CAN OPERATE WITH AUX1, AUX2, OR AUX3 ON THE MAX1566,

AND WITH AUX1 OR AUX3 ON THE MAX1567. TO USE AUX3, FB3L = GND,

AND FB3H IS USED FOR FEEDBACK.

Figure 12. +15V and -7.5V CCD Bias Without Transformer

Using Boost with a Diode-Capacitor Charge Pump (A positive-

output linear regulator (MAX1616) can be used to regulate the

negative output of the charge pump.)

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Rainbow-electronics MAX1567 Manual de usuario Pagina 23

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