CONSONANCE
High-Voltage, Linear High-Brightness LED Driver IC
CN5501
General Description:
The CN5501 current regulator operates from a 4V to
32V input voltage range and delivers up to a total of
1A to one or more strings of high-brightness LEDs.
The output current of the CN5501 is adjusted by
using an external current-sense resistor in series with
the LEDs. An enable input allows wide-range
“pulsed” dimming. The CN5501 is well suited for
applications requiring high-voltage input and is able
to withstand automotive load-dump events up to 32V.
An on-chip power MOSFET minimizes external
components while providing ±5% output current
accuracy.
Also an EQ pin is adopted for equalizing LED
current among multiple CN5501 used in parallel.
Additional features include a 5V regulated output
and thermal regulation, etc.
The CN5501 is available in a thermally enhanced
8-pin SOP package and 8-pin DFN package.
Features:
4V to 32V Operating Voltage
Adjustable LED Current up to 1A
Integrated 32V, 1A MOSFET with 1.5A
Current Limit(Typical)
Low Current-Sense Voltage Reduces Power
Loss
Typical 5% LED Current Accuracy
High-Voltage Chip Enable Input for Dimming
Interface
Current Equalizing Among Multiple CN5501
Used in Parallel
Thermal Regulation
Operating Temperature Range:
－40℃
to 85℃
Available in Thermally-enhanced 8 pin SOP or
8-pin DFN package.
Pb-free，Rohs Compliant and Halogen Free
Pin Assignment
EQ
1
EN
2
GND
3
CS
4
8
7
6
5
Applications:
Lighting Systems
Automotive Interior and Exterior
Navigation indicators
Instrumentation illumination
Signage and Beacons
NC
VCC
VIN
LED
CN5501
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Typical Application Circuit
Figure 1 Typical Application Circuit
Ordering Information
Part Number
CN5501
Package
SOP-8
DFN-8
Shipping
Tape and Reel, 2500/Reel
Tape and Reel, 5000/Reel
Operating
temperature
－40℃
to 85℃
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Pin Description
Pin No.
1
2
3
Name
EQ
EN
GND
Function Description
LED Current Equalizing Pin.
This pin should be connected to other
CN5501’s EQ pin for equalizing LED current when multiple CN5501 are used
in parallel to drive multiple LED strings.
High Voltage Enable Pin.
Drive EN pin to high to enable the output.
Ground Terminal.
This pin is the negative terminal of input supply.
LED Current Sense Pin.
The LED current is sensed and set by the resistor
between CS pin and GND. The equation to calculate the LED current is:
4
CS
Where,
I
LED
＝
0.153÷(R
CS
＋0.03)
I
LED
is the LED current in ampere(A)
R
CS
is the resistance from CS pin to GND in ohm(Ω)
5
6
LED
VIN
Current Sink Pin.
Drain of the on-chip power MOSFET，the LED string(s)
should be connected between LED pin and VIN.
Positive Terminal of Input Supply.
This pin is the power supply of internal
circuit.
＋5V
Regulator Output Pin.
A voltage of 5V(Typical) is output out of this
pin with 3mA output capability.
Connect a 2.2μF to 10uF compensation capacitor from VCC pin to GND.
No Connection.
Exposed Pad.
Connect to the GND plane for effective power dissipation. Do
not use as the only ground connection.
7
8
-
VCC
NC
EP
Absolute Maximum Ratings
VIN, EN and LED Pin Voltage…..…－0.3V to 36V
Other Pins Voltage…….…….……..－0.3V to 6.5V
Thermal Resistance(Junction to Case) …....65℃/W
Lead Temperature(Soldering)……………….260℃
Operating Temperature…............－40℃ to 85℃
Maximum Junction Temperature………….150℃
Storage Temperature………......－65℃ to 150℃
Stresses beyond those listed under ‘Absolute Maximum Ratings’ may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these or any other conditions above those indicated in the operational
sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect
device reliability.
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Electrical Characteristics
(VIN＝15V, T
A
＝－40℃
to 85℃, unless otherwise noted)
Parameters
Symbol
Test Conditions
Input Supply Voltage
Operating Current
Shutdown Supply
Current
VIN Under Voltage
Lockout
VIN Under Voltage
Lockout Hysteresis
The CS pin voltage
LED pin Leakage
Current Limit
VIN
I
VIN
I
SD
V
UVLO
H
UVLO
V
EN
＝VIN,
no LED current
V
EN
≤0.3V
V
EN
=VIN and VIN rises from
2.5V until V
CS
>100mV
2.85
0.22
Min
4
220
320
Typ
Max
32
420
3
3.35
Unit
V
uA
uA
V
V
CURRENT REGULATION
V
CS
I
LKG
I
LIMIT
I
LED
＝100mA
Dropout Voltage
(Note 1)
I
LED
＝300mA
V
DROP
I
LED
＝500mA
I
LED
＝750mA
I
LED
＝1A
Thermal Regulation
Thermal Regulation
Temperature
EN Pin
EN Input Voltage High
EN Input Voltage Low
EN Bias Current
EN Turn-on Time
＋5V
Regulator(VCC Pin)
VCC Voltage
Short Circuit Current
VCC
0≤I
VCC
≤2mA,
VIN≥5.5V
VCC＝0V
4.7
5
4.4
5.35
V
mA
V
IH
V
IL
I
EN
t
ON
EN’s rising edge to 90% of LED
current
－100
270
3.1
0.6
＋100
V
V
nA
uS
T
REG
110
125
140
O
R
CS
＝3Ω,
normal operation
VIN＝32V, V
EN
＝0V
144
1.15
152
1.5
0.18
0.36
0.5
0.7
0.9
160
10
2
mV
uA
V
C
Note 1:
Dropout voltage is measured across LED pin and CS pin when LED current is decreased by 5%.
Detailed Description
The CN5501 is a high-current regulator capable of providing up to a total of 1A of current to one or more strings
of high-brightness LEDs. A wide operating input voltage range of +4V to +32V makes the CN5501 ideal for
automotive applications.
A +5V regulated output provides up to 3mA of current to power external circuitry. EQ pin can equalize the LED
current among multiple CN5501 used in parallel to drive multiple LED strings. In addition, the CN5501 features
thermal regulation instead of thermal shutdown. If the voltage drop across LED pin and CS pin is high, or the
LED current is large, or both the voltage drop and LED current are large, CN5501 will become heater, when the
silicon temperature reaches 125℃, the on-chip thermal regulation circuit begins to function, the LED current
will be decreased to keep CN5501’s silicon temperature at 125℃(typical).
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The wide operating voltage range helps protect the CN5501 against large transients such as those found in
load-dump situations up to 32V.
The CN5501 uses a feedback loop to control the LED current. The voltage across the sense resistor R
CS
is
compared to a fixed reference voltage, and the error is amplified to serve as the drive to the internal power
MOSFET. The regulated LED current is user defined by the value of R
CS
between CS pin and GND.
Application Information
Input Voltage Considerations
The operating voltage range of the CN5501 is
＋4V
to
＋32V
. The device may operate below +4V, however,
LED current may not meet the full regulation specification. For proper operation, the minimum input voltage
must always be higher than the worst-case sum of the forward drops of all series-connected LEDs at the output
of the CN5501.
+5V Regulator
The CN5501 includes a fixed +5V output regulator that delivers up to 3mA of load current for low-power
applications throughout the +5.5V to +32V input voltage range. Connect a 2.2μF to 10uF compensation
capacitor from VCC pin to GND.
The
+5V output can be used to power the external circuitry.
Thermal Regulation
The CN5501 features thermal regulation instead of thermal shutdown. If the voltage drop across LED pin and
CS pin is high, or the LED current is large, or both the voltage drop and LED current are large, CN5501 will
become heater, when the silicon temperature reaches 125℃, the on-chip thermal regulation circuit begins to
function, the LED current will be decreased to keep the silicon temperature at 125℃(typical). This typically
occurs in overload or LED short-circuit conditions.
Setting the LED Current
The CN5501 uses a current sense resistor between CS pin and GND to set the LED current. The LED current is
given by the equation below:
I
LED
＝0.153÷(R
CS
＋0.03)
Where, I
LED
is the LED current in ampere(A)
R
CS
is the resistance from CS pin to GND in ohm(Ω)
PWM Dimming
The CN5501 provides pulsed or chopped current dimming. Generally, high-brightness LEDs are binned to match
at their full-rated current. However, LEDs from the same bin exhibit poor matching at currents other than
full-rated current. To achieve uniformity, high brightness LED manufacturers recommend PWM pulsing of the
LED current at their full-rated value. This can be achieved by pulsing the enable input (EN) while having a
constant voltage at VIN, as shown in Figure 2. The PWM signal frequency should be less than 300Hz.
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