XC9119D10A Ver la hoja de datos (PDF) - TOREX SEMICONDUCTOR

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Fabricante

XC9119D10A

1MHz, PWM Controlled, Step-Up DC/DC Converter, Ceramic Capacitor Compatible

TOREX SEMICONDUCTOR 

XC9119D10A Series

■OPERATIONAL EXPLANATION (Continued)

<CE/SS (Pin No. 4): Chip Enable / Soft-Start Pin>

Pin No. 4 can be used as in either chip enable (CE) pin or soft-start (SS) pin. The IC takes about 5mS at most to attain the

setting voltage after starting operation (CE ‘H’) even though the RSS is 0Ω and the CSS is not connected.

Soft-start function is good for setting a longer time than the start-up time when the RSS is 0Ω and the CSS is not connected.

Soft-start operates while the CE pin voltage increases from 0V to around 1.9V. The following equation is used with the values of

Vcont voltage, the RSS and the CSS.

T = - CSS x RSS x In {(Vcont – 1.6) / Vcont}

●Start-up waveform

when the RSS is 0Ω and the CSS is not connected

RSS=0Ω, No CSS, VIN=3.6V, VOUT=15V, IOUT=3mA

1ch: VOUT

0V (1ch) ⇒

Ex.) When CSS=0.1uF, RSS=220kΩ, Vcont=5V,

T= - 0.1e – 6 x 220e3 x In{(5-1.6)/5} = 8.48mS

0V (2ch) ⇒

2ch: CE

Time:500uS/div.

1ch:5V/div., 2ch:2V/div.

RSS

Vcont

CE/SS Pin

CE Vref

CSS

Error Amp.

Ex.) Reference Circuit 1: N-ch Open Drain

Vcont

ON/OFF

Signal

RSS

CE/SS Pin

CSS

Ex.) Reference Circuit 2: CMOS Logic (Low Supply Current)

Vcont

ON/OFF

Signal

RSS

CSS

CE/SS Pin

Ex.) Reference Circuit 3: CMOS Logic (Low Supply Current), Quick-Off

ON/OFF

Signal

Vcont

RSS

CSS

CE/SS Pin

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