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CAT4101
Application Information
Single 12 V Supply
The circuit shown in Figure 16 shows how to power three
LEDs in series from a single 12 V supply using the
CAT4101. The CAT4101 can not be driven directly from
12 V, three components are needed to create a lower voltage
for the VIN pin (below 5.5 V). Resistor R2 and zener diode
D provide a regulated voltage while the quiescent current
runs through the N ? Channel transistor M. Suitable parts for
this circuit are the ON Semiconductor MM3Z6V2 zener
diode and the 2N7002L N ? channel transistor (SOT23
package).
For a given package style and board layout, the operating
junction temperature T J is a function of the power
dissipation P D , and the ambient temperature, resulting in the
following equation:
T J + T AMB ) P D ( q JC ) q CA ) + T AMB ) P D q JA
The CAT4101 TO ? 263 5 ? lead package provides a thermal
resistance when the ground tab is soldered down to the PCB.
When mounted on a double ? sided printed circuit board with
two square inches of copper allocated for “heat spreading”,
the resulting q JA is about 30 ° C/W.
For example, at 60 ° C ambient temperature, the maximum
power dissipation is calculated as follow:
+ 150 * 60 + 3 W
P Dmax +
12 V
C2
1 m F
R2
5 k W
D
6.2 V
C1
0.1 m F
M
VIN LED
CAT4101
T Jmax * T AMB
q JA 30
Recommended Layout
The board layout should provide good thermal dissipation
through the PCB. Multiple via can be used to connect the tab
of the CAT4101 to a large ground plane underneath the
EN/PWM
package.
Input capacitor C1 should be placed as close to the driver
R1
RSET
GND
IC as possible. The RSET resistor should have a Kelvin
connection to the GND pin of the CAT4101.
Figure 16. Single Supply Driving Three LEDs
Power Dissipation
The power dissipation (P D ) of the CAT4101 can be
calculated as follows:
P D + (V IN
I IN ) ) (V LED
I LED )
where V LED is the voltage at the LED pin. Combinations of
high V LED voltage or high ambient temperature can cause
the CAT4101 to enter thermal shutdown. In applications
where V LED is high, a resistor can be inserted in series with
the LED string to lower P D .
Thermal dissipation of the junction heat consists
primarily of two paths in series. The first path is the junction
to the case ( q JC ) thermal resistance which is defined by the
package style, and the second path is the case to ambient
( q CA ) thermal resistance, which is dependent on board
layout. The overall junction to ambient ( q JA ) thermal
resistance is equal to:
q JA + q JC ) q CA
Figure 17. CAT4101 Recommended Layout
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