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參數(shù)資料
| 型號： | LX2173CM |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 254K |
| 代理商： | LX2173CM |
1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR
LX2172/73
PRODUCT DA T ABOOK 1996/1997
Copyright 1998
Rev. 0.4
a 12/04
4
P RELIMINAR Y D AT A S HEET
GND
1
3
V
C
21
FB
3
2
SYNC
4
ENABLE
4
V
IN
55
E
1
6
V
SW
74
E
2
8
Signal ground. Keep separate from power grounds (E
1 and E2).
Output of transconductance error amplifier. An R-C compensation network is connected from
this pin to the ground to stabilize the feedback loop. If this pin is pulled lower than 0.15V, the
IC goes into micropower mode.
Error amplifier inverting input. A resistor divider from the output of the converter to this pin sets
its nominal voltage.
LX2172 only. This pin is used to synchronize the device directly with a logic level input pulse.
External synchronization frequency must always be at a higher frequency than the minimum
internal clock. When not used, should be left open.
LX2173 only. This pin is the input to the enable comparator. A voltage under 1.4V will put the
device in micropower mode. Pin must be connected to V
IN when not in use.
Input supply voltage (3.0V to 25V).
Power return of first transistor (Q
1).
This pin must be connected to ground.
Collector of output transistors. Connect to external inductor or input voltage, depending on circuit
topology.
Grounding this pin sets the current limit point to the maximum value. If pin is left open, the current
limit is set to half its maximum value.
Pin
Pin #
Name
(8-pin Pkgs.) (5-pin TO-220)
Description
FUNCTIONAL PIN DESCRIPTION
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
Units
LX2172 / 2173
Min.
Typ.
Max.
0.2
2
sec
26
V
0.7
V
100
400
A
15
A
SYNC Pulse Width
SYNC Input HI
SYNC Input LO
SYNC Input Current HI
Input = 2V
SYNC Input Current LO
Input = 0.4V
SYNC Input Section (LX2172 only)
0.4
1.2
2.4
V
200
A
100
A
Enable Input Threshold
HI Input Current
Input = 2.4V
LO Input Current
Input = 0.4V
ENABLE Section (LX2173 only)
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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