ZXLD1360ET5TA Diodes Zetex, ZXLD1360ET5TA Datasheet - Page 14

• Manufacturer Part Number: ZXLD1360ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1360ET5TA

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 1MHz
• Voltage - Supply: 7 V ~ 30 V
• Voltage - Output: 30V
• 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
• Operating Supply Voltage (min): 7V
• Operating Supply Voltage (max): 30V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1360ET5TR

Application Information
Directly driving ADJ input
A Pulse Width Modulated (PWM) signal with duty cycle D
output current to a value above or below the nominal average value set by resistor R
Driving the ADJ input via open collector transistor
The recommended method of driving the ADJ pin and controlling the amplitude of the PWM waveform is to use a small NPN
switching transistor as shown below:
This scheme uses the 200k resistor between the ADJ pin and the internal voltage reference as a pull-up resistor for the
external transistor.
Driving the ADJ input from a microcontroller
Another possibility is to drive the device from the open drain output of a microcontroller. The diagram below shows one
method of doing this:
If the NMOS transistor within the microcontroller has high Drain / Source capacitance, this arrangement can inject a negative
spike into ADJ input of the 1360 and cause erratic operation but the addition of a Schottky clamp diode (cathode to ADJ) to
ground and inclusion of a series resistor (10k) will prevent this. See the section on PWM dimming for more details of the
various modes of control using high frequency and low frequency PWM signals.
ZXLD1360
Document number: DS33471 Rev. 4 - 2
V
0V
ADJ
MCU
PWM
GND
GND
PWM
10k
ADJ
ADJ
ADJ
(cont.)
ZXLD1360
ZXLD1360
ZXLD1360
GND
GND
GND
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PWM
14 of 25
can be applied to the ADJ pin, as shown below, to adjust the
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March 2011