參數(shù)資料
型號: 700B
廠商: Lineage Power
元件分類: DC/DC變換器
英文描述: Power Module: Custom Dc-Dc Converter, 24 V to 97 V Adjustable Output(DC-DC轉(zhuǎn)換器,24V-97V可調(diào)輸出)
中文描述: 功率模塊:自定義的DC - DC轉(zhuǎn)換器,24 V至97 V可調(diào)輸出(的DC - DC轉(zhuǎn)換器,24V輸入97V可調(diào)輸出)
文件頁數(shù): 3/8頁
文件大?。?/td> 154K
代理商: 700B
Lucent Technologies Inc.
3
Data Sheet
October 1996
5 Vdc Input; 24 V to 97 V Adjustable Output; 0.1 W
700B Power Module: Custom dc-dc Converters;
Applications Information
Output Voltage Adjustment
The output voltage is adjusted using 12 switches in a
DIP package. The switch settings are used to adjust
the output voltage with a ladder network of precision
resistors. The value of the resistances on the ladder
network are R, 2R, 4R, 8R, 16R, up to 204.8K, where
R is 100
. Figure 1 illustrates the ladder network. The
value of Rb is the parallel value of all resistors with
closed switches in series.
8-1180(C)
Figure 1. R2R Ladder Network
Pin 4 is intended to allow for a ~0.2% per
the output voltage when used with the specified
thermistor. However, the exact value and accuracy of
the output voltage is a function of the thermistor
resistance, Rt. The equation below shows how to
calculate the output voltage as a function of the ther-
mistor resistance (Rt) and the equivalent resistance
(Rb):
°
C change in
S1
100
S2
200
S12
204.8 k
RB
V
O
76.67
=
4.324 k
+ Rt
Rt
+
5.789 k
148
Rb
+
----------Rb
×
×
Pin 5 is intended to allow for a ~0.1% per
the output voltage when used with the specified
thermistor. However, the exact value and accuracy of
the output voltage is a function of the thermistor resis-
tance, Rt. The following equation shows how to calcu-
late the output voltage as a function of the thermistor
resistance (Rt) and the equivalent resistance (Rb):
°
C change in
External Current Limit
The output of this module is not current limited, and
protection against overloads is recommended.
A 10 k
—0.1
μ
F R-C filter on the output has been
used in some applications to minimize the possibility of
overloads. This can also be used to filter output voltage
overshoot seen at start-up.
V
O
76.67
8.443k
Rt
Rt
+
+
6.978k
Rb
Rb
+
148
×
×
=
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