CAT4104V-GT3 ON Semiconductor, CAT4104V-GT3 Datasheet - Page 9

• Manufacturer Part Number: CAT4104V-GT3
• Description: IC LED DRIVER 4CH 175MA 8SOIC
• Manufacturer: ON Semiconductor
• Type: Backlight, HBLED Driverr

Specifications of CAT4104V-GT3

• Constant Current: Yes
• Topology: PWM
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED)
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 25V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 175mA
• Internal Switch(s): No
• Number Of Digits: 4
• Low Level Output Current: 175 mA
• High Level Output Current: 700 mA
• Operating Supply Voltage: - 0.3 V to + 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Efficiency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Application Information
Single 12 V Supply
LEDs from a single 12 V supply using the CAT4104. Three
external components are needed to create a lower voltage
necessary for the VIN pin (below 5.5 V). The resistor R2 and
zener diode Z provide a regulated voltage while the
quiescent current runs through the N−Channel transistor M.
The recommended parts are ON Semiconductor MM3Z6V2
zener diode (in SOD−323 package), and 2N7002L
N−Channel transistor (in SOT23).
Daylight Detection
automatic light sensor application. The light sensor allows
the CAT4104 to be enabled during the day and disabled
during the night. Two external components are required to
configure the part for ambient light detection and conserve
power. Resistor R1 sets the bias for the light sensor. The
recommended part is Microsemi LX1972 light sensor. For
best performance, the LED light should not interfere with
the light sensor.
5 V
12 V
1 mF
C2
1 mF
The circuit shown in Figure 20 shows how to power the
The circuit in Figure 21 shows how to use CAT4104 in an
C2
Sensor
Figure 20. Single Supply Driving 12 LEDs
Light
VDD
VSS
6.2 V
5 kW
R2
Z
0.1 mF
100 kW
R1
Figure 21. Daylight Detection
C1
0.1 mF
R1
OFF
C1
R1
ON
M
VIN
RSET
EN/PWM
RSET
EN/PWM
CAT4104
VIN
GND
CAT4104
GND
LED2
LED3
LED4
LED1
LED3
LED4
LED1
LED2
http://onsemi.com
9
Nightlight Detection
CAT4104 in an automatic night light application. The light
sensor allows the CAT4104 to be disabled during the day and
enabled during the night. Five external components are
needed to properly configure the part for night detection.
Resistor R3 limits the quiescent current through the
N−Channel transistor M. Resistors R1 and R2 act as a
voltage divider to create the required voltage to turn on
transistor M, which disables the CAT4104. The
recommended parts are ON Semiconductor 2N7002L
N−Channel transistor (in SOT23) and the Microsemi
LX1972 light sensor. For best performance, the LED light
should not interfere with the light sensor.
LED Current Derating
derating to avoid over−driving the LED under high ambient
temperatures, by reducing the LED current to protect the
LED from over−heating. The positive thermo coefficient
(PTC) thermistor RPTC is used for temperature sensing and
should be located near the LED. As the temperature of
RPTC increases, the gate voltage of the MOSFET M1
decreases. This causes the transistor M1 on−resistance to
increase which results in a reduction of the LED current. The
circuit is powered from a single VCC voltage of 5 V. The
recommended
PTCSS12T071DTE and ON Semiconductor 2N7002L
N−Channel transistor (in SOT23).
such that the LED current is constant within the normal
temperature range. But as soon as the ambient temperature
exceeds a max threshold, the LED current drops to protect
the LEDs from overheating.
5 V
1 mF
C2
The circuit shown in Figure 22 illustrates how to use the
The circuit shown in Figure 23 provides LED temperature
The PCB and heatsink for the LED should be designed
1 MW
R2
Sensor
Light
VDD
VSS
100 kW
R1
Figure 22. Nightlight Detection
parts
100 kW
0.1 mF
M
R3
OFF
C1
R4
ON
are
VIN
RSET
EN/PWM
CAT4104
Vishay
GND
LED1
LED2
LED3
LED4
70°C
thermistor