ZXLD1322DCCTC Diodes Zetex, ZXLD1322DCCTC Datasheet - Page 12

• Manufacturer Part Number: ZXLD1322DCCTC
• Description: IC LED DRIVR WHITE BCKLGT 14-DFN
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1322DCCTC

• Topology: PWM, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: White LED
• Frequency: 600kHz
• Voltage - Supply: 2.5 V ~ 15 V
• Mounting Type: Surface Mount
• Package / Case: 14-DFN
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 700mA
• Internal Switch(s): Yes
• Efficiency: 80%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: ZXLD1322DCCTR

ZXLD1322
Document number: DS32166 Rev. 3 - 2
The TADJ pin of the device has a voltage threshold of 75mV nominal, which is derived from the reference voltage V
the voltage (V
thermal compensation is applied. However, if VT
produced that is proportional to V
I
value when V
The threshold voltage has been chosen to set a nominal threshold of 105°C and the device has been optimized to operate
with a standard 103KT1608 thermistor and 5k resistor in the potential divider. Circuit details are given in the application
notes. Alternative thermistor/resistor networks can be used providing the input resistance presented to the device at the
TADJ pin is similar at the threshold temperature. If no LED thermal compensation is required, the TADJ pin should be
connected to V
ADJ
, causing the control loop to decrease the LED current. The LED current will be reduced to less than 10% of the set
TADJ
TADJ
REF
falls below 50mV.
) on the TADJ pin is held above the threshold, the thermal compensation current will be zero and no
to disable this function.
TADJ
. ITC is injected into the control loop in such a way as to reduce the demand current
ADJ
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falls below the threshold, a thermal compensation current (ITC) is
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ZXLD1322
April 2010
REF
. If