XCL211 datasheet(10/16 Pages) TOREX

10 / 16 page

10/16

XCL211/XCL212 series

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NOTE ON USE

1. Please use this IC within the stated maximum ratings. For temporary, transitional voltage drop or voltage rising phenomenon,

the IC is liable to malfunction should the ratings be exceeded.

2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.

Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.

3. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the possibility that some

cycles may be skipped completely.

4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and there is the

possibility that some cycles may be skipped completely.

5. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when dropout voltage or

load current is high, current limit starts operation, and this can lead to instability. When peak current becomes high, please adjust the coil

inductance value and fully check the circuit operation. In addition, please calculate the peak current according to the following formula:

Ipk = (VIN-VOUT)×OnDuty / (2×L×fOSC) + IOUT

L : Coil Inductance Value

fOSC: Oscillation Frequency

6. Use of the IC at voltages below the recommended voltage range may lead to instability.

7. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.

8. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the leak current of the

P-channel driver transistor.

9. The XCL211/XCL212 uses fold-back circuit limiter. However, fold-back may become “droop” affected by the wiring conditions. Care must

be taken especially for CIN distance and position.

10. If CL capacitance reduction happens such as in the case of low temperature, the IC may enter unstable operation. Care must be taken for

CL capacitor selection and its capacitance value.

1ch VLx ：2.0V/diｖ

2ch VOUT ：50mV/diｖ

Ta = - 50℃

VIN = 3.6V, VOUT = 0.9V, fOSC = 2.4MHz

CIN = 20μF(Ceramic)

CL = 14.7μF(Ceramic)

IOUT = 300mA

11. Torex places an importance on improving our products and its reliability.

However, by any possibility, we would request user fail-safe design and post-aging treatment on system or equipment.

x-axis : 2.0μs / div

XCL211 Datasheet(PDF) 10 Page - Torex Semiconductor