TS1935B Ver la hoja de datos (PDF) - TSC Corporation

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Fabricante

TS1935B

1.9A / 1.2MHz Boost DC to Dc Converter

TSC Corporation 

Preliminary

TS1935B

1.9A / 1.2MHz Boost DC to Dc Converter

Application Information

Setting the Output Voltage

Application circuit item shows the basic application circuit with AX5511 adjustable output version. The external

resistor sets the output voltage according to the following equation:

R2

VOUT = 1.238V × (1+ R1)

For most applications, R2 is a suggested a value by 390K~820KΩ. Place the resistor-divider as close to the IC as

possible to reduce the noise sensitivity.

Under Voltage Lockout (UVLO)

To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the

device, if the input voltage falls below (2.35V-130mV).

Input Capacitor Selection

The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input

capacitor impedance at the switching frequency shall be less than input source impedance to prevent high

frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must

be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and

small temperature coefficients. A 10µF ceramic capacitor for most applications is sufficient. For a lower output

power requirement application, this value can be decreased.

Output Capacitor Selection

The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The

output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R

dielectrics are recommended due to their low ESR and high ripple current. A 4.7uF ceramic capacitors works for

most of the applications. Higher capacitor values can be used to improve the load transient response.

Layout Guide

4/6

Version: Preliminary

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