ZXLD1362ET5TA Diodes Zetex, ZXLD1362ET5TA Datasheet - Page 26

• Manufacturer Part Number: ZXLD1362ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1362ET5TA

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 500kHz
• Voltage - Supply: 6 V ~ 60 V
• Voltage - Output: 60V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 95%
• Operating Supply Voltage (typ): 9/12/15/18/24V
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Package Type: TSOT-23
• Pin Count: 5
• Mounting: Surface Mount
• Power Dissipation: 1W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Compliant
• Other names: ZXLD1362ET5TR

A Product Line of
Diodes Incorporated
ZXLD1362
Application Information
(cont.)
Dimming Output Current Using PWM
Low frequency PWM mode
When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage V
and a low level of
ADJ
zero, the output of the internal low pass filter will swing between 0V and V
, causing the input to the shutdown circuit to
ADJ
fall below its turn-off threshold (200mV nom) when the ADJ pin is low. This will cause the output current to be switched on
and off at the PWM frequency, resulting in an average output current I
proportional to the PWM duty cycle.
OUTavg
(See Figure 4 - Low frequency PWM operating waveforms).
Figure 4. Low Frequency PWM Operating Waveforms
The average value of output current in this mode is given by:
I
= 0.1D
/R
[for D
>0.001]
OUTavg
PWM
S
PWM
This mode is preferable if optimum LED 'whiteness' is required. It will also provide the widest possible dimming range
(approx. 1000:1) and higher efficiency at the expense of greater output ripple.
26 of 28
ZXLD1362
March 2011
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© Diodes Incorporated
Document number: DS33472 Rev. 3 - 2