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參數(shù)資料
| 型號： | LX1742 |
| 廠商： | Microsemi Corporation |
| 英文描述： | High Efficiency High Voltage Boost Controller |
| 中文描述： | 高效率高電壓升壓控制器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 456K |
| 代理商： | LX1742 |
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
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LX1742
High Efficiency High Voltage Boost Controller
P
RODUCTION
D
ATA
S
HEET
I N T E G R A T E D P R O D U C T S
E V A L U A T I O N B O A R D ( C O N T I N U E D )
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
Remove the factory installed jumper and insert a 4 ~6cm wire loop (
optional
) to observe the inductor
current waveform using a current probe.
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.
Use this position when adjusting the output with an external PWM that has a repetition rate in excess of
100KHz.
JU3
1
JU1
1 / 0 / 0
JU4
0 / 1 / 0
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
Part Description
Ref
C1
CAPACITOR, 4.7
μ
F, 1210, 35V
C2
CAPACITOR, 4.7
μ
F, 1210, 35V
C3
CAPACITOR, 1000pF, 0805, 35V
C4
CAPACITOR, 2.2
μ
F, 0603, 35V
C5 & C6
CAPACITOR, (SPARE); see note 1.
CR1
Microsemi
UPS5819, SCHOTTKY, 1A, 40V, POWERMITE
L1
INDUCTOR, 47
μ
H, 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.
2.
Use these locations to insert additional input (C6) and/or output (C5) capacitance.
The minimum part set for a working power supply consists of: C1, C2, CR1, L1, R2, R3, R4, U1.
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