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W-6137TD-GT データシート(PDF) 9 Page - Copal Electronics

部品番号 W-6137TD-GT
部品情報  CMOS Boost Converter
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メーカー  COPAL [Copal Electronics]
ホームページ  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6137TD-GT データシート(HTML) 9 Page - Copal Electronics

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W-6137
9
Device Operation
The W-6137 is a fixed frequency (1 MHz), low noise,
inductive boost converter providing constant current to the
load. A high voltage internal CMOS power switch is used to
energize the external inductor. When the power switch is
then turned off, the stored energy inductor is released into
the load via the external 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 external feedback resistor
connected to the feedback pin (FB). The value of external
resistor will accurately set the LED bias 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.
While in normal operation, the device will comfortably
deliver up to 30 mA of bias current into a string of up to 5
white LEDs.
In the event of a “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. In
addition, an internal clamping circuit will limit the peak
output voltage to 29 V. If this fault condition is repaired, the
device will automatically resume normal operation.
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.
Enable
Current
Sense
300 mV
R1
15
C1
Thermal
Shutdown
& UVLO
1MHz
Oscillator
Over Voltage
Protection
PWM &
Logic
Driver
C2
GND
SW
FB
+
+
VIN
VIN
VREF
SHDN
RC
CC
RS
N1
Figure 23. Block Diagram
VOUT
ILED
A1
A2


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