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I NTEGRATED C IRCUITS D IVISION
The switching frequency is determined by:
CPC9909
The minimum inductor value for a given ripple current
F S = 1 -------------
L MIN = -------------------------- ? t off
Where:
– D
t off
is:
V LEDstring
? I L
? D = duty cycle
? t off = Off-time
In general, switching frequency selection is based on
the inductor size, controller power dissipation, and the
input filter capacitor.
The typical off-line LED driver switching frequency, f S ,
is between 30 kHz and 120 kHz.
This operating range gives the designer a reasonable
compromise between switching losses and inductor
size. The internal off-time one-shot has an accuracy of
±20%. The figure below shows the R T resistor
selection for the desired off-time.
Where:
? ? I L = Ripple Current
The inductor peak current is given by:
I LPeak = I LED + 0.5 ? I L
2.9 Gate Output Drive
The CPC9909 uses an internal gate drive circuit to
turn on and off an external power MOSFET. The gate
driver can drive a variety of MOSFETs. For a typical
off-line application, the total MOSFET gate charge will
be less than 25nC.
45
40
35
30
25
20
15
10
5
0
R T v s Off-Time
t off ( μ S)
0
500
1000
1500
2000
2500
3000
V LEDstring
R T (K Ω )
2.8 Inductor Design
The inductor value is defined by the LED/inductor
ripple current, minimum off time, and the output
voltage. The minimum off time is determined by the
duty cycle and switching frequency. The duty cycle is
given by:
D = --------------------------
V in ? min ?
Where:
? V LEDstring is the LED string voltage at the desired
average LED current.
? V in(min) is the minimum DC input voltage.
8
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