LTM8045 datasheet(49/54 Pages) AD

49 / 54 page

LTM4655

Rev. 0

For more information www.analog.com

TYPICAL APPLICATIONS

Figure 48. 1.25A, –24V Output DC/DC μModule Regulator

*D1 OPTIONAL (SEE EFFECT IN FIGURE 49): CENTRAL SEMICONDUCTOR P/N CMMSH1-40L

**ONE CHANNEL SHOWN. PINS NOT USED AND NOT SHOWN IN THIS CIRCUIT: NC, SVINFn, IMONnb,

LDOIN, LDOOUT, CLKSET, MOD, CLKOUTn, CLKINn, TEMP+, TEMP–

ISET

na ISETnb

VINn

SVINn

VDn

RUN

INTVCCn

VINREG

COMP

PGOOD

VOSNSn+

GND

VOUTn+

VOUTn–

SVOUTn–

PGDFB

EXTVCCn

IMON

LTM4655**

–24VOUT

UP TO 1.25A

COUTn

10µF

×2

LOAD

RfSETn

165k

RISETn

481k

CDn

4.7 F

VIN

12V

4655 F48

fSETn

CDGNDn

4.7 F

CINOUTn

4.7 F

CINHn

4.7 F

3.3V

RPGOODn

100k

RPGDFBn

196k

D1*

REXTVCCn

100Ω

CEXTVCCn

1µF

RUN

Figure 49. Start-Up Waveforms at 12VIN, Figure 48 Circuit

(a) Start-up Performance with D1 Not Installed.

VOUTn– Reverse-Polarity at Start-Up Transiently

Reaches 500mV

1ms/DIV

VOUTn–

10V/DIV

VOUTn–

200mV/DIV

RUN

n, 5V/DIV

PGOOD

n, 5V/DIV

4655 F49a

(b) Start-up Performance with D1 Installed.

VOUTn– Reverse-Polarity at Start-Up is Transiently

Limited to 360mV

1ms/DIV

VOUTn–

10V/DIV

VOUTn–

200mV/DIV

RUN

n, 5V/DIV

PGOOD

n, 5V/DIV

4655 F49b

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