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參數(shù)資料
| 型號(hào)： | ZXCT1009 |
| 廠商： | Zetex Semiconductor |
| 英文描述： | HIGH-SIDE CURRENT MONITOR |
| 中文描述： | 高端電流監(jiān)視器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 216K |
| 代理商： | ZXCT1009 |
ISSUE 3 - APRIL 2001
ZXCT1009
6
Li-Ion Charger Circuit
The above figure shows the ZXCT1009 supporting
the Benchmarq bq2954 Charge Management IC.
Most of the support components for the bq2954 are
omitted for clarity. This design also uses the Zetex
FZT789A high current Super- PNP as the switching
transistor in the DC-DC step down converter and the
FMMT451 as the drive NPN for the FZT789A. The
circuit can be configured to charge up to four Li-Ion
cells at a charge current of 1.25A. Charge can be
terminated on maximum voltage, selectable
minimum current, or maximum time out. Switching
frequency ofthePWM loopis approximately 120kHz.
The ZXCT1009 is intended as a direct functional
replacement for the ZDS1009, which is featured in a
complete design from Unitrode/Texas Instruments
on the Li-Ion charger circuit shown above.
Reference:
DVS 2954S 1H
Development System.
Li-Ion
Charger
100
0.2
100
FZT789A
FMMT3904
1k
FMMD914
10μH
FMMT451
140μH
ZHCS1000
220
SNS pin
MOD pin
Charger Input
To Battery +
bq2954
5V
ZXCT1009
support components omitted for clarity
+
-
Vin
Load
Iout
APPLICATIONS INFORMATION (Continued)
Transient Protection
An additional resistor, Rlim can be added in series
with Rout (figure 1.0), to limit the current from I
out
.
Any circuitconnected to Voutwill be protected from
input voltage transients. This can be of particular
use in automotive applications where load dump
and other common transients need to be
considered.
Figure 1.0
ZXCT1009 with additional current limiting Resistor
Rlim.
Assuming the worst case condition of V
out
= 0V;
providing a low impedance to a transient, the
minimum value of R
lim
is given by:-
R
(min)
V
V
I
lim
pk
max
pk
=
V
pk
= Peak transient voltage to be
withstood
V
max
= Maximum working Voltage = 20V
I
pk
= Peak output current = 40mA
The maximum value of R
lim
is set by V
in
(min),
V
out
(max) and the dropout voltage (see transfer
characteristic on page 3) of the ZXCT1009 :-
R
R
[V
V
(max)
V
(max)
V
lim
out
in
dp
out
out
(max)
(min)
(
)]
=
+
V
in
(min)
Voltage
V
dp
=Dropout Voltage
V
out
(max)= Maximum Operating Output
Voltage
= Minimum Supply Operating
V
in
To Load
V
out
R
sense
R
R
lim
ZXCT
1009
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXCT1009_05 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:HIGH-SIDE CURRENT MONITOR |
| ZXCT1009_07 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:HIGH-SIDE CURRENT MONITOR |
| ZXCT1009_11 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:HIGH-SIDE CURRENT MONITOR |
| ZXCT1009F | 制造商:Diodes Incorporated 功能描述:CURRENT MONITOR 0.02A 3SOT23 制造商:Diodes Incorporated 功能描述:CURRENT MONITOR, 0.02A, 3SOT23 制造商:Diodes Incorporated 功能描述:IC, CURRENT MONITOR, 9.98mA, 3-SOT-23; Supply Voltage:20V; Digital IC Case Style:SOT-23; No. of Pins:3; No. of Regulated Outputs:1; Operating Temperature Min:-40C; Operating Temperature Max:85C; Filter Terminals:Surface Mount ;RoHS Compliant: Yes |
| ZXCT1009F | 制造商:Diodes Incorporated 功能描述:CURRENT MONITOR SMD 1009 SOT233 |
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