ZXLD1362ET5TA Diodes Inc, ZXLD1362ET5TA Datasheet - Page 24

• Manufacturer Part Number: ZXLD1362ET5TA
• Description: LED Drivers 1A/60V LED DRIVER
• Manufacturer: Diodes Inc

Specifications of ZXLD1362ET5TA

• Operating Supply Voltage: 6 V to 60 V
• Maximum Power Dissipation: 1000 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TSOT-23
• Minimum Operating Temperature: - 40 C
• Led Driver Application: Automotive Lighting, Illuminated Signs
• Topology: Buck (Step Down)
• No. Of Outputs: 1
• Output Current: 1A
• Input Voltage: 6V To 60V
• Dimming Control Type: PWM / DC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application Information
Operation at low supply voltage
Below the under-voltage lockout threshold (VSD) the drive to the output transistor is turned off to prevent device operation
with excessive on-resistance of the output transistor. The output transistor is not full enhanced until the supply voltage
exceeds approximately 17V. At supply voltages between V
dissipation due to the on-resistance.
If the supply voltage is always less than 30V continuous an alternative device is available, the ZXLD1360 or the AL8805.
Note that when driving loads of two or more LEDs, the forward drop will normally be sufficient to prevent the device from
switching below approximately 6V. This will minimize the risk of damage to the device.
Thermal considerations
When operating the device at high ambient temperatures, or when driving maximum load current, care must be taken to
avoid exceeding the package power dissipation limits. The graph below gives details for power derating. This assumes the
device to be mounted on a 25mm
Note that the device power dissipation will most often be a maximum at minimum supply voltage. It will also increase if the
efficiency of the circuit is low. This may result from the use of unsuitable coils, or excessive parasitic output capacitance on
the switch output.
Thermal compensation of output current
High luminance LEDs often need to be supplied with a temperature compensated current in order to maintain stable and
reliable operation at all drive levels. The LEDs are usually mounted remotely from the device so, for this reason, the
temperature coefficients of the internal circuits for the ZXLD1362 have been optimized to minimize the change in output
current when no compensation is employed. If output current compensation is required, it is possible to use an external
temperature sensing network - normally using Negative Temperature Coefficient (NTC) thermistors and/or diodes, mounted
very close to the LED(s). The output of the sensing network can be used to drive the ADJ pin in order to reduce output
current with increasing temperature.
ZXLD1362
Document number: DS33472 Rev. 3 - 2
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0
-50
-30
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(cont.)
PCB with 1oz copper standing in still air.
-10
Maximum Power Dissipation
10
Ambient Temperature (Deg C)
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SD
50
and 17V care must be taken to avoid excessive power
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Diodes Incorporated
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© Diodes Incorporated
ZXLD1362
March 2011