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PDF AN2903 Data sheet ( Hoja de datos )
| Número de pieza | AN2903 | |
| Descripción | Application Note | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN2903 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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AN2093
APPLICATION NOTE
ST1S03
BUCK CONVERTERS FOR HDD POWER SUPPLIES
1. ABSTRACT
The ST1S03 is a step down DC-DC converter optimized for powering the low-voltage digital core in HDD
applications and, generally, replacing the high current linear solution when the power dissipation may
cause excessive heating of the application environment. It provides up to 1.5A over an input voltage range
of 3V to 16V. A high switching frequency (1.5MHz) allows the use of tiny surface-mount components, as
well as the use of a resistor divider to set the output voltage value. Only an inductor, a Schottky diode and
www.DataShettwoepoto4lcUoag.pcyaoacmintodrsbyartehereuqsueiroefd.loBweEsi.dSe.Rs,.
a low
SMD
output ripple is guaranteed by
ceramic capacitors. The device
the current mode PWM
is thermal protected and
current limited to prevent damages due to accidental short circuit. The ST1S03 is available in DFN6 (3x3)
package.
Figure 1: Assembled Board
2. INTRODUCTION
Purpose of this application note is to provide a brief summary of the specifications and the functionality of
the application board.
The ST1S03 is an adjustable current mode PWM step-down DC/DC converter with internal 1.5A power
switch.
It is a complete 1.5A switching regulator with an internal compensation that eliminates additional
components.
The constant frequency, current mode, PWM architecture and stable operation with ceramic capacitors
results in a low, predictable output ripple. In order to maintain the regulation with light load, the device
starts to work in pulse skipping. In a typical application where the input voltage is 5V and Vout is 1.2V, the
device goes in pulse skipping for Iout lower than 15mA.
December 2004
Rev. 2
1/6
1 page  
6. REVISION HISTORY
Table 2: Revision History
Date
10-Dec-2004
15-Dec-2004
www.DataSheet4U.com
AN2093 - APPLICATION NOTE
Revision
1
2
Description of Changes
First Release
In figure 2 the zener diode has
been replaced by a Schottky diode
5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN2903.PDF ] | |
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