參數(shù)資料
型號(hào)： DRM043
英文描述： Li-on Battery Charger Reference Design Designer Reference Manual
中文描述： 李鵬總理對(duì)電池充電器參考設(shè)計(jì)，設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù)： 22/80頁(yè)
文件大小： 1025K
代理商： DRM043
Hardware
Designer Reference Manual
DRM040 — Rev 0
22
Hardware
MOTOROLA
2.3 Baseline (V
refh
/2) and V
refh
voltage generation
A precision reference of type TL431ACLP is used to generate the
nominal 2495mV V
refh
/2 voltage for the baseline (AC voltage shifting)
voltage. This voltage is scaled up by a factor of 2 using an
MC33501SNT1 opamp. This opamp has been selected as it has a very
low offset voltage, operates at low supply voltages and delivers high
output current at output voltages close to the positive supply. To
guarantee a precise step up by two, the feedback divider resistors (R6
and R7) have been selected such that they are equal in value. Their
absolute value is not important. V
refh
obtained at the opamp’s output,
supplies both the MCU’s V
refh
and V
dda
pins. The opamp is supplied
from +5,7 volts in order to guarantee an output of +4990 millivolts under
loaded condition.
2.4 Supply transformer, rectifier-filter, voltage regulator
The supply transformers secondary voltage determines the lowest
possible line voltage for correct operation. The given transformer
operates down to a guaranteed 160 volts. The diode bootstrapped
MC78L05 regulator delivers approximately 5,7 volts to supply the
reference, the opamp and the RS-232D level shifter. The regulator
output feeds the MCU over the diode D3 to reduce the voltage back to
+5 volts, and to avoid backward supply of the regulator from the
SuperCap or Li-Ion battery in case of power failure.
2.5 Power failure detector
The power failure detector is designed to detect the absence of full-wave
sinusoids. If more that one half-cycle is missing, capacitor C2 can
charge up over R17 sufficiently to turn on transistor Q2 to pull the IRQ
pin of the MCU low. The power fail detection time can be changed by
scaling the value of C2.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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