參數(shù)資料
型號(hào)： LT1840-7Z
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 32/32頁(yè)
文件大?。?/td> 1000K
代理商： LT1840-7Z
BCD20023 Rev. AA, 3-Sep-2008
Page 9 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
Output Voltage Regulation (Battery Charger)
In normal operating mode (neither in power limitation nor in
current limitation) the output is regulated by a voltage feedback
loop. It is adjusted to Vo set and can be set by the cell voltage
selector switch to the appropriate float charge voltage of the
battery.
A control input (pin 28) allows for adjustment of the output
voltage either by a voltage source, a temperature sensor, or an
external potential divider (see External Output Voltage
Control). For fine tuning, the converter is fitted with a trim
potentiometer accessible from the rear side.
The output voltage relates to the output current and the input
1.1%
0.55%
– 0.9%
0.01
0.5
1
Io/Io nom
V
o
05046a
Vo set
Fig. 12
Typical output droop T1240/1740/1840
voltage, which ensures current sharing without further
precautions, when several converters are connected in
parallel. An increase in output current and a decrease in input
voltage decrease the output voltage, according to the formula:
Vo
≈ Voset tol + (0.5 – Io/Io nom) Vo l + (Vi – Vi nom)/100 V VoV
The dynamic characteristic is shown in fig. 9.
Output Power Limitation (Battery Charger)
All battery charger versions exhibit an output power limitation
mode, where the output power is kept constant from 2.35 V/cell
(for lead acid batteries) to 1.6 V/cell.
The maximum input current is limited to Ii L. At lower input
voltage Vi red, the maximum output power is limited to:
Po
≈ η Vi red Ii L
(
η = efficiency approx. 90%).
Inhibit (Rectifier Version)
The rectifier version converters are equipped with a simple
inhibit function (with no adjustment of Vo). The converter is
enabled by a logic high signal and disabled by a logic low
signal. This input is TTL/CMOS compatible, a resistor
<50
disables the converter, a resistor
>30 k enables it. The
switch-on time t r, i.e., the time delay between powering until
the full output power is available, is typically 100 ms.
The hold-up time at the output after inhibiting depends on the
load, the internal and external capacitance at the output.
Note: The inhibit input is protected against overvoltage up to 60 V.
Fig. 11a
Output characteristic of T1240 (typ.). The droop is shown in
fig. 12.
Fig. 11b
Output characteristic of T1740 (typ.). The droop is shown in
fig. 12.
Io
0
Vo
40.88 V
06067a
11 A
16 A
42.4 V
37.9 V
28.5 V
Io
0
Vo
54.5 V
06066a
10 A
14.5 A
56.5 V
50.5 V
38 V
Io
0
Vo
26.7 V
06065a
15 A
20 A
28.25 V
25.25 V
19 V
Fig. 11c
Output characteristic of LT1840 (typ.). The droop is shown in
fig. 12.
Table 6: Characteristics of the inhibit signal
Characteristics
Conditions
min
typ max Unit
Vinh
Inhibit
Vo = on
Vi min – Vi max
2.5
60
V
voltage
TC min – TC max
Rinh
Resistance Vo = on
30
k
to Vo–
Vinh
Inhibit
Vo = off
–0.7
0.4
V
voltage
Rinh
Resistance Vo = off
50
t r
Switch-on time
Vi nom
100
ms
until full power avail.
Pinh
Input power with
3
W
inhibited unit
相關(guān)PDF資料
PDF描述
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