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| 型号： | LX1741CLM-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.145 A SWITCHING CONTROLLER, PDSO8 |
| 封装： | PLASTIC, MLP-8 |
| 文件页数： | 15/15页 |
| 文件大小： | 479K |
| 代理商： | LX1741CLM-TR |
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
2000
Rev. 1.1b, 2005-03-03
WWW
.Microse
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i
.CO
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LX1741
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
EVALUATI ON BOA RD
OVERVIEW
The LXE1741 evaluation board is available from
Microsemi for assessing overall circuit performance. The
evaluation board, shown in Figure 5, is 3 by 3 inches (i.e.,
7.6 X 7.6cm) square and factory calibrated to provide a
nominal 18V output from a 1.6V to 6.0V input. Circuit
designers can easily modify output voltage and current to
suit their particular application by replacing the R1 and RCS
values respectively. Moreover, inductor, FET, and diodes
are easily swapped out to promote design verification of a
circuit that maximizes efficiency and minimizes cost for any
particular application. The input and output connections are
described in Table 1.
ELECTRICAL CONNECTIONS
Apply the DC input voltage to VBAT (not VCC)
however, the LX1741 IC may be driven from a separate DC
source via the VCC input (if desired). Connect the test load
to VOUT.
Primary output voltage adjustment is
accomplished by selecting the appropriate value for R1.
Optional fine adjustment of the output voltage is achieved
by applying either a DC voltage or a PWM-type signal to
the VADJ input. Both low frequency (f < 100KHz) and high
frequency (f > 100KHz) PWM signals are accommodated
by choosing the appropriate jumper connection. Further, the
VADJ circuit can be bypassed by selecting the appropriate
jumper position (see Table 2).
The LX1741 exhibits a low quiescent current (IQ < 1A:
typ) during shutdown mode. The SHDN pin can be used to
examine shutdown performance on the evaluation board.
This pin is pulled-up to VCC via a 10K resistor.
Grounding the SHDN pin shuts down the IC however, the
load is still capable of drawing current through the inductor
& diode circuit path. Hence, VOUT during shutdown will be
approximately VBAT minus the inductor and diode forward
voltage drop.
The LX1741 can achieve output voltages in excess of
25V. In certain applications, it is necessary to protect the
load from excessive voltage excursions. The evaluation
board provides a VLIM jumper position for this purpose.
Engaging this jumper position ensures that the output
voltage does not exceed 25V.
The LXE1741 evaluation board provides an easy and cost
effective solution for evaluation on the LX1741.
The
factory installed component list for the evaluation board is
provided in Table 3 and the schematic is shown in Figure 6.
Figure 7
– LX1741 Circuit Evaluation Board
Table 1: Input and Output Pin Assignments
Pin
Name
Allowable
Range
Description
VBAT
0 to 6V
Main power supply for output. (Set external current limit to 0.5A)
VCC
1.6V to 6V
LX1741 power. May be strapped to VBAT or use a separate supply if VCC jumper is in the
SEP position. Do not power output from VCC pin on board..
SHDN
0 to VCC
Pulled up to VCC on board (10K), Ground to inhibit the LX1741.
VOUT
VCC to 25V
Programmed for 18V output, adjustable up to 25V.
VADJ IN
0 to VCC
Apply a DC input or PWM input to adjust the output voltage.
Note: All pins are referenced to ground.
EE
VV
AA
LL
BB
OO
AA
RR
DD
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