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參數(shù)資料
| 型號： | LX1742CDU-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 456K |
| 代理商： | LX1742CDU-TR |
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
2000
Rev. 1.0b, 2005-03-03
WWW
.Microse
m
i
.CO
M
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
EVALUATI ON BOA RD ( C ONTI N UED)
Table 2: Jumper Pin Position Assignments
Jumper / Position
Function
VIN
n/a
Attach the primary input power form to this contact. Input power may also be applied to the pin marked
Vin on J4.
VOUT
n/a
Use this contact to measure the circuit’s output voltage at pin 8.
SWITCH
n/a
Use this contact to observe the switching waveform at the Schottky anode (i.e., LX1742 pin 1).
FDBK
n/a
Use this contact to measure the circuit’s feedback voltage at pin 3.
GND /
GND2
n/a
Use these contact to connect to circuit ground.
/SHDN
1 / 0
Inserting a jumper (1) enables the LX1742 by connecting pin 4 directly to VIN. Removing this jumper (0)
disables the LX1742
JU3
1
Remove the factory installed jumper and insert a 4 ~6cm wire loop (optional) to observe the inductor
current waveform using a current probe.
JU1
1 / 0 / 0
Use this position when adjusting the output with an external PWM that has a repetition rate less than
100KHz. Or when using a DC adjustment voltage.
JU4
0 / 1 / 0
Use this position when adjusting the output with an external PWM that has a repetition rate in excess of
100KHz.
JU5
0 / 0 / 1
Use this position to ground the ADJ (pin 5) when using the LX1742 in a fixed output voltage mode
Note: (1) = jumper installed; (0) = jumper not installed.
Table 3: Factory Installed Component List for the LX1742 Evaluation Board
Ref
Part Description
C1
CAPACITOR, 4.7F, 1210, 35V
C2
CAPACITOR, 4.7F, 1210, 35V
C3
CAPACITOR, 1000pF, 0805, 35V
C4
CAPACITOR, 2.2F, 0603, 35V
C5 & C6
CAPACITOR, (SPARE); see note 1.
CR1
Microsemi
UPS5819, SCHOTTKY, 1A, 40V, POWERMITE
L1
INDUCTOR, 47H, 480mA, SMT
Q1
MMBT3904 TRANSISTOR, NPN, 40V, SOT-23
D1
BZX84C24, ZENER DIODE, TBD
R1
RESISTOR, 625K, 1/16W, 0805
R2, R5, R6
RESISTOR, 1.0K, 1/16W, 0805
R3
RESISTOR, 1.0M, 1/16W, 0805
R4
RESISTOR, 72K, 1/16W, 0805
R7
RESISTOR, 100K, 1/16W, 0805
U1
Microsemi
LX1742CDU BOOST CONTROLLER; see note 2.
Notes
1.
Use these locations to insert additional input (C6) and/or output (C5) capacitance.
2.
The minimum part set for a working power supply consists of: C1, C2, CR1, L1, R2, R3, R4, U1.
EE
VV
AA
LL
UU
AA
TT
IIOO
NN
BB
OO
AA
RR
DD
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