XD6702 datasheet(11/27 Pages) TOREX

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XD6702

Series

CE“H”Level Voltage

VCE 0V→VIN

VOUT(T)×0.9Ｖ

VOUT

Time[μs]

Voltage [V]

Current [mA]

IIN

IRUSH

tSS

100

150

200

250

300

350

400

450

500

-7.5

-6.0

-4.5

-3.0

-1.5

0.0

1.5

3.0

4.5

6.0

7.5

Time (100

μs/div)

XD6702D501PR-Q

CL=2.2μF

CL=4.7μF

CL=10μF

CE Input Voltage

Output Voltage

Inrush Current

Ta=25℃, V

IN=6.0V, IOUT=1mA,

CE=0V→6.0V, tr=5.0μs

Table 1: Recommended capacitance values (MIN) of CIN and CL

OUTPUT VOLTAGE

RANGE

INPUT

CAPACITOR

OUTPUT

CAPACITOR

VOUT(T)

CIN

1.8V ~ 18.0V

1.0μF

2.2μF

■OPERATIONAL EXPLANATION (Continued)

＜Low ESR capacitor support＞

An internal phase compensation circuit is incorporated in the XD6702 series to enable a stable output voltage to be

obtained even when a low ESR capacitor is used. To stabilize the effect of the phase compensation circuit, always connect

the output capacitor (CL) in direct proximity to the VOUT pin and VSS pin. In addition, to stabilize the input power, connect

the input capacitor (CIN) in direct proximity to the VIN pin and VSS pin. Refer to Table 1 for the recommended capacitance

values to be connected.

Take particular care in selecting the capacitors for CIN and CL, as the bias dependence of the capacitor, the effect of

capacitance loss due to temperature characteristics and other factors, and the effects of ESR may prevent stable phase

compensation. Table 1 shows recommended capacitance values (MIN) for the actual bias and temperature conditions

used for the capacitor. Select capacitances that satisfy Table 1 in all environments in which the product is to be used.

＜Soft start＞

The XD6702 series limits the rush current (IRUSH) that suddenly flows from VIN to VOUT to charge the output capacitor (CL)

when the IC starts, and is also able to limit fluctuations of VIN due to IRUSH.

The soft start time(tss) is optimized

internally(370μs TYP.). The soft start time(tss) is defined as the VOUT reaches 90% of VOUT(T) from the time when CE H

threshold is input to the CE pin.

Timing chart at IC start-up

Example of the inrush current wave form at IC start-up

XD6702 Datasheet(PDF) 11 Page - Torex Semiconductor

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