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AN487 Fiches technique(PDF) 6 Page - STMicroelectronics

No de pièce AN487
Description  INTRODUCTION TO A 10A MONOLITHIC SWITCHING
PDF  13 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN487 Fiches technique(HTML) 6 Page - STMicroelectronics

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AN487 APPLICATION NOTE
6/13
Figure 10. Error amplifier circuit
UNDERVOLTAGE LOCKOUT
The chip features a complete built-in under voltage lock out protection, keeps the power output stage off
up to the moment Vcc reaches 11v, with an hysteresis of 1V. After reaching the 11V value the system
starts with the soft start feature.
ERROR AMPLIFIER
The error amplifier is a transconductance Operational Amplifier featuring a current output. The simplified
schematic is represented in fig.10. The basic characteristics of the uncompensated operational amplifier
are the following:
–GM = 4mA/V,
–Ro = 2.5Mohm,
–AVo =80dB,
–Isource/sink = 200µA
–IInput Bias Current = 0.3µA
The frequency behavior of the uncompensated amplifier is reported in fig.11.
Figure 11. Open loop gain (error amplifier only).



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