ZXLD1356ET5TA Diodes Zetex, ZXLD1356ET5TA Datasheet - Page 18

• Manufacturer Part Number: ZXLD1356ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1356ET5TA

• 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: 550mA
• Internal Switch(s): Yes
• Efficiency: 97%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1356ET5TR

Application Information
Setting nominal average output current with external resistor R
The nominal average output current in the LED(s) is determined by the value of the external current sense resistor (R
connected between V
I
The table below gives values of nominal average output current for several preferred values of current setting resistor (R
typical application circuit shown on page 1:
The above values assume that the ADJ pin is floating and at a nominal voltage of V
minimum allowed value of sense resistor under these conditions to maintain switch current below the specified maximum value.
It is possible to use different values of R
Output current adjustment by external DC control voltage
The ADJ pin can be driven by an external dc voltage (V
nominal average value defined by R
The nominal average output current in this case is given by:
I
Note that 100% brightness setting corresponds to V
proportion to prevent I
The input impedance of the ADJ pin is 50kΩ ±25% for voltages below V
ZXLD1356
Document number: DS33470 Rev. 3 - 2
DC
OUTnom
OUTdc
R
GND
= (V
0.36
0.56
1.33
+
S
= 0.2/R
(Ω)
ADJ
/1.25) x (0.2/R
S
[for R
Nominal average output
IN
OUTdc
ADJ
and I
S
current (mA)
> 0.36Ω]
exceeding 550mA maximum.
SENSE
555
357
150
S
) [for 0.3< V
and is given by:
S
ZXLD1356
.
S
GND
if the ADJ pin is driven from an external voltage. (See next section).
ADJ
<2.5V]
ADJ
ADJ
= V
www.diodes.com
), as shown, to adjust the output current to a value above or below the
REF
18 of 29
. When driving the ADJ pin above 1.25V, R
REF
and 14.2kΩ ±25% for voltages above V
S
Diodes Incorporated
REF
A Product Line of
(=1.25V). Note that R
S
must be increased in
S
© Diodes Incorporated
ZXLD1356
= 0.36V is the
REF
December 2010
+100mV.
S
) in the
S
)