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W-6139TD-GE Arkusz danych(PDF) 8 Page - Copal Electronics

Numer części W-6139TD-GE
Szczegółowy opis  22 V High Current Boost
Download  13 Pages
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Producent  COPAL [Copal Electronics]
Strona internetowa  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6139TD-GE Arkusz danych(HTML) 8 Page - Copal Electronics

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W-6139
8
Device Operation
The W-6139 is a fixed frequency (1 MHz), low noise,
inductive boost converter that provides a constant current
with excellent line and load regulation. The device uses a
high voltage CMOS power switch between the SW pin and
ground to energize the inductor. When the switch is turned
off, the stored energy in the inductor is released into the load
via the Schottky diode.
The on/off duty cycle of the power switch is internally
adjusted and controlled to maintain a constant regulated
voltage of 0.3 V across the feedback resistor connected to the
feedback pin (FB). The value of the resistor sets the LED
current accordingly (0.3 V/R1).
During the initial power up stage, the duty cycle of the
internal power switch is limited to prevent excessive in rush
currents and thereby provide a “soft start” mode of
operation.
In the event of an “Open LED” fault condition, where the
feedback control loop becomes open, the output voltage will
continue to increase. Once this voltage exceeds 24 V, an
internal protection circuit will become active and place the
device into a very low power safe operating mode.
Thermal overload protection circuitry has been included
to prevent the device from operating at unsafe junction
temperatures above 150 C. In the event of a thermal
overload condition the device will automatically shutdown
and wait till the junction temperatures cools to 130 C before
normal operation is resumed.
Application Information
External Component Selection
Capacitors
The W-6139 only requires small ceramic capacitors of
4.7 F on the input and 1 F on the output. Under normal
condition, a 4.7
F input capacitor is sufficient. For
applications with higher output power, a larger input
capacitor of 10
F may be appropriate. X5R and X7R
capacitor types are ideal due to their stability across
temperature range.
Inductor
A22
H inductor is recommended for most of the
W-6139 applications. In cases where the efficiency is
critical, inductances with lower series resistance are
preferred. Inductors with current rating of 800 mA or higher
are
recommended
for
most
applications.
Sumida
CDRH6D28 220 22
H inductor has a rated current of
1.2 A and a series resistance (D.C.R.) of 128 m
typical.
Schottky Diode
The current rating of the Schottky diode must exceed the
peak current flowing through it. The Schottky diode
performance is rated in terms of its forward voltage at a
given current. In order to achieve the best efficiency, this
forward voltage should be as low as possible. The response
time is also critical since the driver is operating at 1 MHz.
Central Semiconductor Schottky rectifier CMSH1 40 (1 A
rated) is recommended for most applications.
LED Current Setting
The LED current is set by the external resistor R1
connected between the feedback pin (FB) and ground. The
formula below gives the relationship between the resistor
and the current:
R1
0.3 V
LED current
Table 5. RESISTOR R1 AND LED CURRENT
LED Current (mA)
R1 ( )
20
15
25
12
30
10
100
3
300
1


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