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CPC9909NE

P1-P3P4-P6P7-P9P10-P12
I
NTEGRATED
C
IRCUITS
D
IVISION
CPC9909
4 www.ixysic.com R05
1.3 Absolute Maximum Ratings
Electrical absolute maximum ratings are at 25ºC.
Absolute maximum ratings are stress ratings.
Stresses in excess of these ratings can cause
permanent damage to the device. Functional
operation of the device at conditions beyond those
indicated in the operational sections of this data sheet
is not implied.
Parameter Symbol Maximum Unit
Input Voltage to GND
V
IN
-0.5 to +560 V
Inputs and Outputs Voltage to GND CS, LD, PWMD, GATE
-0.3 to V
DD
+0.3
V
V
DD
, Externally Applied V
DD.EXT
15 V
Power Dissipation:
SOIC-8 With Thermal Tab
P
D
2.5 W
SOIC-8 W/O Thermal Tab 0.975 W
Junction Temperature, Operating
T
J
-55 to +150 °C
Operating Temperature
T
A
-55 to +85 °C
Storage Temperature
T
STG
-55 to +150 °C
I
NTEGRATED
C
IRCUITS
D
IVISION
CPC9909
R05 www.ixysic.com 5
1.4 Recommended Operating Conditions
1.5 Electrical Characteristics
Unless otherwise specified, all electrical specifications are provided for T
A
=25C.
1.6 Thermal Characteristics
1
Use of a four-layer PCB can improve thermal dissipation (reference EIA/JEDEC JESD51-5).
Parameter Symbol Minimum Typical Maximum Unit
Input Voltage Range
V
IN
12 - 550
V
DC
PWMD Frequency
f
PWMD
- 500 - Hz
Operating Temperature
T
A
-40 - +85 °C
Parameter Conditions Symbol Minimum Typical Maximum Unit
Input
Input Voltage Range DC Input Voltage
V
IN
8 - 550
V
DC
Shut-Down Mode Supply Current
V
IN
=8 to 550V, PWMD to GND
I
IN
-0.30.6mA
Regulator
Voltage Regulator Output
V
IN
=15V to 550V, I
DD
=0, I
GATE
=0 V
DD
77.88.4
V
DC
V
DD
Current Available
for External Circuitry
-
I
DD
--2mA
V
DD
Load Regulation V
IN
=15V, I
DD
=1mA V
DD
- 150 200 mV
PWM Dimming
PWMD Input Low Voltage
V
IN
=8V to 550V V
PWMD(low)
--0.5
V
PWMD Input High Voltage
V
IN
=8V to 550V V
PWMD(high)
2.4 - -
PWMD Pull-Down Resistance -
R
PWMD
70 115 165 k
Current Sense Comparator
Current Sense Input Current
Input Low CS=0V
I
IL
-5 - 5
A
Input High
CS=V
DD
I
IH
-5 0 5
Current Sense Threshold Voltage
-40°C <
T
A
< 85°C, V
IN
=15V to 550V
V
CS(high)
200 250 300
mV
-55°C <
T
A
< -40°C, V
IN
=15V to 550V
180 - 300
Current Sense Blanking Interval
R
T
=400k t
BLANK
- 400 - ns
Delay from CS Trip to Gate Low
R
T
=400k t
DELAY
- 300 - ns
Minimum Off-Time One-Shot
Minimum Off-Time
R
T
=400k t
off
6-8s
Gate Driver
Gate High Output Voltage
I
OUT
=-10mA V
GATE(high)
V
DD
-0.3 V
DD
-0.06
-
V
Gate Low Output Voltage
I
OUT
=+10mA V
GATE(low)
- 0.03 0.3
Gate Output Rise Time
C
GATE
=500pF
t
RISE
-16-
ns
Gate Output Fall Time
C
GATE
=500pF
t
FAL L
-7-
Parameter Package Symbol Minimum Typical Maximum Unit
Thermal Resistance,
Junction-to-Ambient
SOIC-8 With Thermal Pad (NE)
1
R
JA
-50-
°C/W
SOIC-8 W/O Thermal Pad (N) - 128 -
I
NTEGRATED
C
IRCUITS
D
IVISION
CPC9909
6 www.ixysic.com R05
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 (R
SENSE
)
exceeds V
CS(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, R
SENSE
, and the internal voltage
threshold, V
CS(high)
. This internal voltage threshold can
also be set externally via the LD pin. The lower of
these two thresholds and R
SENSE
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 V
CS(high)
at
the desired rate. To utilize the soft start function,
connect a resistor divider from V
DD
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
R
T
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
51kΩ
2.2kΩ
0.1μF
P1-P3P4-P6P7-P9P10-P12

CPC9909NE

Mfr. #:
Buy CPC9909NE
Manufacturer:
IXYS Integrated Circuits
Description:
LED Lighting Drivers 8V-550V 2.5W
Lifecycle:
New from this manufacturer.
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