Instrukcja obsługi Microchip MIC5203/05/06/07/16/19
Microchip
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MIC5203/05/06/07/16/19
Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip MIC5203/05/06/07/16/19 (4 stron) w kategorii nieskategoryzowany. Ta instrukcja była pomocna dla 9 osób i została oceniona przez 5 użytkowników na średnio 3.6 gwiazdek
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December 1998 1 LDO Regulator Evaluation Board
LDO Regulator Evaluation Board
MIC5203/05/06/07/16/19 LDO Regulators
General Description
This board can be used to evaluate several linear, low-
dropout voltage regulators in the SOT-23-5 package. The
board can accommodate any one of the following parts:
MIC5203
MIC5205
MIC5206
MIC5207
MIC5216
MIC5219
These regulators can be used to generate a well-regulated
voltage from a higher, unregulated dc voltage. Since each
regulator may have dierent features, this board has been
designed to ease the evaluation of any of these features. A
breadboarding area is also included so that further circuitry
can be designed for evaluation with the regulator.
Requirements
The LDO evaluation board requires a power source with a
voltage capability of 20V and at least 500mA of current.
Several digital multimeters will be used to evaluate the
dierent characteristics, as well as an oscilloscope to monitor
input and output waveforms.
Circuit Description
The evaluation board contains a basic circuit with jumpers to
connect dierent portions of the circuit depending on which
device is being evaluated. The MIC5203 in the SOT-23-5
package is a simple LDO that only requires pins 1 3, and–
pin 5 to be used. Pin 4 is a no connect and it is not used. The
xed voltage versions of the MIC5205/5207/5219 have a
noise bypass pin, which can be connected to the circuit for
evaluation through a simple jumper. The MIC5205/5207/
5219 adjustable parts give the user the option to set their own
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
output voltage. By switching the appropriate jumper, the
adjust resistors can be used to set the output voltage. The
bypass capacitor can be used in conjunction with the adjust
resistors to get a low-noise, adjustable output. Finally, the
MIC5206/5216 LDOs have an error ag output that can be
evaluated by using the appropriate jumper as well. The
functionality of each of the jumpers is described in the
Table 1.
The basic circuit contains an input capacitor, an output
capacitor and several other components that can be con-
nected through the jumpers.
Each device can be evaluated for the following characteris-
tics: dropout voltage, ground current, and enable turn-on
characteristics.
Ground Current
With JP2 open, an ammeter can be placed across the jumper
to measure current owing to ground. This places the meter
in series with the ground pin. The meter should be highly
accurate, preferably a 61⁄2 digit meter or better so that the
current can be measured reliably. The input and output
voltages need to be monitored so that the device is not
operating in dropout. The input should be 1V more positive
than the output to measure standard ground current mea-
surements at load. The output voltage will not be the nominal
rated output voltage due to the impedance that is introduced
into the ground lead. This is not important for the evaluation.
The key aspect of this evaluation is the dierential voltage
from input to output. This can be measured by putting a DMM
from input to output. JP2 need to be replaced to continue the
evaluation. (JP1 should be closed for this evaluation. JP3/4/5
may be needed depending on the part number. JP6 can be
left open on all circuits for this evaluation.)
U1
MIC52xx-BM5
IN OUT
GND
V
IN
EN ADJ C2
10µF
35V
CON1
R1 10k
100k
C3
470pF
50V
V
EN
C1
1µF
35V
TP2 TP1
JP1 JP5
JP3
R2
100k
JP4
CON1
J5
J4
CON1
CON1
CON1
GND
J1
J2
J3
VR1
JP2
JP6
Figure 1. Evaluation Board Schematic
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | nieskategoryzowany |
| Model: | MIC5203/05/06/07/16/19 |
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