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GR6004PG Datasheet(PDF) 7 Page - Grenergy Opto, lnc.

Part # GR6004PG
Description  Constant Current Switching Converter for High Brightness LED Driving
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Manufacturer  GRENERGY [Grenergy Opto, lnc.]
Direct Link  http://www.grenergy-ic.com/
Logo GRENERGY - Grenergy Opto, lnc.

GR6004PG Datasheet(HTML) 7 Page - Grenergy Opto, lnc.

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2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
7
GR6004
Application Information
Start Up Function
The GR6004 has an internal fixed start up period
that is approximately 0.5ms. This function can
prevent the inrush current in power on process.
VCC Regulator
The VCC is the output terminal of the internal
regulator. A ceramic capacitor in this pin for voltage
regulation is required. The capacitance range is
from 0.1µF to 1µF.
Enable Function
An enable function was applied in GR6004. A logic
high cause the GR6004 active and the logic low
disable the operation. The soft start period starts
when the enable signal restarts the operation of
GR6004. Locate a 100K
resistor between EN and
VIN to force the GR6004 operating with the VIN
greater than 9V. If the VIN is between 4.5V to 9V,
connect the EN to VIN directly.
Input Capacitor Selection
The input capacitor must have a rated voltage
greater than the maximum input voltage. The rated
ripple current in RMS of the input capacitor also
must be greater than the RMS value of input current.
The (1) could use to find the RMS value of input
current.
(
)
( )
1
I
D
1
D
I
LED
IN_RMS
=
Where, IIN_RMS is the RMS value of input current, ILED
is the average current of LED.
Inductor Selection
The value of the inductor in the power stage could
find by the inductor current ripple. A reasonable
range of the inductor current ripple is range from
20% to 40% of the output LED driving current. The
(2) could find by observing Figure-1 to calculate the
inductance.
(
) (
)
( )
2
T
V
0.2
V
V
I
K
V
0.2
V
L
S
IN
LED
IN
LED
D5
LED
1
+
+
=
Where, k is the part of ILED in percentage to define
the magnitude of inductor current ripple, TS is the
period of a switching cycle.
Figure-1 The Sketch map explains the inductor current
ripple, inductor voltage, LED current setting and
PWM dimming.
Output Capacitor Selection
The output capacitor could easy find by (3). Besides,
the rated voltage must be greater than the output
voltage.
( )
3
V
8
I
K
T
C
O
LED
S
O
=
Where, ∆VO is the output voltage ripple that
accepted by the users.
Freewheel Diode Selection
Two specifications of freewheel diode must be
considered, the maximum reverse voltage must be
greater than the maximum voltage across the
freewheel diode. The average rectified current also


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