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L9803 Datasheet(PDF) 31 Page - STMicroelectronics

No. de pieza L9803
Descripción Electrónicos  Super smart power motor driver with 8-Bit MCU, RAM, EEPROM, ADC, WDG, Timers, PWM and H-bridge driver
PDF  126 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9803 Datasheet(HTML) 31 Page - STMicroelectronics

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L9803
Voltage Regulator
31/126
4
Voltage Regulator
4.1
Introduction
The on chip voltage regulator provides two regulated voltage, nominally 5V both. VCC
supplies ADC and the analog periphery and VDD supplies the microcontroller and logic
parts. These voltage are available at pins VDD and VCC to supply external components and
connects a capacitors to optimize EMI performance. A pre-regulator circuit allows to connect
external tantalum capacitors to a lower (10V) voltage (VB2 pin).
4.1.1
Functional Description
The main supply voltage is taken from VB1 pin. A voltage pre-regulator provides the
regulated voltage on pin VB2. VB2 is the supply for the digital and analog regulators. The
block diagram shows the connections between the regulators and the external pins.
In order to prevent negative spikes on the battery line to propagate on the internal supply
generating spurious reset, a series diode supply VB1 pin is recommended.
Figure 15.
Voltage regulation block diagram
ADC
PRE-REGULATOR
VB1
VB2
force
ANALOG
VOLTAGE
REGULATOR
sense
VCC
AGND
DIGITAL
VOLTAGE
REGULATOR
VDD
GND
Battery



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