ZXLD1362ET5TA Diodes Inc, ZXLD1362ET5TA Datasheet - Page 26

• 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

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