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CPC9909 Datasheet(PDF) 6 Page - IXYS Corporation

Part # CPC9909
Description  High Effciency,Off-line, High Brightness LED Driver
Download  12 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

CPC9909 Datasheet(HTML) 6 Page - IXYS Corporation

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INTEGRATED CIRCUITS DIVISION
CPC9909
6
www.ixysic.com
R03
2. Functional Description
Figure 1 Typical Application Circuit
2.1 Overview
The CPC9909 drives the LEDs via a minimum
off-time, peak-current-limited, pulse-frequency
modulation scheme. This control scheme is inherently
stable, and the driver can be operated above a 50%
duty cycle without any open-loop instability or
sub-harmonic oscillations. Since the switching
frequency depends on the LED load current, it results
in a high efficiency operation.
2.2 LED Driver Theory of Operation
The typical application circuit is as shown in Figure 1
When PWMD is high, the control circuit is enabled and
the gate driver turns on the external power MOSFET
(Q1), causing the inductor (L1) current to ramp up until
the voltage across the current sense resistor (RSENSE)
exceeds VCS(high). When the voltage at the CS pin
exceeds this threshold, the gate driver turns Q1 off.
Q1 remains off for the duration of the fixed minimum
off-time. While the switch is off, the inductor continues
to deliver the current to the load though the diode
(D1). When the off-time expires, Q1 turns on again
until the peak current limit is reached, and the process
repeats.
The peak current limit threshold is set by the external
sense resistor, RSENSE, and the internal voltage
threshold, VCS(high). This internal voltage threshold can
also be set externally via the LD pin. The lower of
these two thresholds and RSENSE set the peak current
in the inductor.
A soft start function can be implemented by ramping
up the DC voltage at the LD pin from 0V to VCS(high) at
the desired rate. To utilize the soft start function,
connect a resistor divider from VDD to ground and a
capacitor from the LD pin to ground, as shown in
Figure 2 Soft-Start Circuit
CPC9909
Voltage
Regulator
Voltage
Reference
Q
TRIG
Minimum Off-Time
One Shot
S
R
Q
-
+
-
+
V
DD
V
IN
LD
PWMD
GND
CS
GATE
8 - 550V
V
DD
RT
R
T
R
T
R
SENSE
Q1
D1
L1
Buck Configuration
C
VDD
CPC9909
V
IN
CS
GND
GATE
R
T
LD
V
DD
PWMD
51k
Ω
2.2k
Ω
0.1
μF


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