SM8132A 데이터 시트보기 (PDF) - Nippon Precision Circuits

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SM8132A

White LED Driver IC

Nippon Precision Circuits  

SM8132A

PERIPHERAL PARTS

About the External Capacitors

The best capacitors for use with the SM8132A are multi-layer ceramic capacitors. When selecting a multi-layer

ceramic capacitor, only X5R and X7R dielectric types are strongly recommended, since the loss of capacitance

in various conditions is less than other types such as Z5U and Y5V. The much loss of capacitance in various

conditions may cause the output voltage unstable.

Table. The EIA three digit "TC" code

Lower temperature limit High temperature limit

X = −55°C

Y = −30°C

Z = +10°C

5 = +85°C

6 = +105°C

7 = +125°C

8 = +150°C

Maximum allowable capacitance

change from +25°C (0V DC)

F = ± 7.5%

P = ± 10%

R = ± 15%

S = ± 22%

T = +22%/−33%

U = +22%/−56%

V = +22%/−82%

For example

: X5R

About the Input Capacitor "C4"

The parts layout of PCB may merely cause the “VOUT” output voltage unstable. In this case, increasing the

“C4” input capacitance value or adding another capacitor on the VIN input line is effective to solve the unsta-

ble output voltage.

About the LED Current Setting Resistor "RSET"

The LED drive current variation depends on the LED drive current setting resistor “RSET” variation. There-

fore, a precise resistor is recommended for RSET. The ISET output current value is about 20µA, so a 1/10 watt

class resistor is acceptable as the RSET.

NIPPON PRECISION CIRCUITS INC.—15

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