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ZXLD1356DACTC
ZXLD1356DACTC | |
|---|---|
| Manufacturer Part Number | ZXLD1356DACTC |
| Description | IC LED DRIVER WHITE BCKLGT 6-DFN |
| Manufacturer | Diodes Zetex |
| Type | Backlight, White LED |
| ZXLD1356DACTC datasheets |
|
Availability: By request
International delivery:
Warranty: 60 days
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Specifications of ZXLD1356DACTC | |||
|---|---|---|---|
| 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 | 6-DFN |
| 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 | ZXLD1356DACTR |
PrevNext
Device Description
The device, in conjunction with the coil (L1) and current sense resistor (R
converter.
Device operation
(refer to Figure 1 - Block diagram and Figure 2 Operating waveforms)
V
IN
LX voltage
0V
V
IN
SENSE voltage
Coil current
0V
0.15V
Comparator
V
input voltage
ADJ
5V
Comparator
output
0V
Operation can be best understood by assuming that the ADJ pin of the device is unconnected and the voltage on this pin (V
appears directly at the (+) input of the comparator.
When input voltage V
is first applied, the initial current in L1 and R
IN
circuit. Under this condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches
the LX pin low, causing current to flow from V
V
and L1 to produce a voltage ramp (V
IN
R1 by the current sense circuit and produces a proportional current in internal resistors R2 and R3. This produces a ground
referred rising voltage at the (-) input of the comparator. When this reaches the threshold voltage (V
switches low and MN turns off. The comparator output also drives another NMOS switch, which bypasses internal resistor R3 to
provide a controlled amount of hysteresis. The hysteresis is set by R3 to be nominally 15% of V
When MN is off, the current in L1 continues to flow via D1 and the LED(s) back to V
by the LED(s) and diode forward voltages to produce a falling voltage at the input of the comparator. When this voltage returns
to V
, the comparator output switches high again. This cycle of events repeats, with the comparator input ramping between
ADJ
limits of V
± 15%.
ADJ
ZXLD1356
Document number: DS33470 Rev. 3 - 2
), forms a self-oscillating continuous-mode buck
S
Toff
Ton
230mV
170mV
ADJ
Figure 2. Theoretical Operating Waveforms
is zero and there is no output from the current sense
S
to ground, via R
, L1 and the LED(s). The current rises at a rate determined by
IN
S
) across R
. The supply referred voltage V
SENSE
S
5 of 29
www.diodes.com
A Product Line of
Diodes Incorporated
ZXLD1356
200mV
V
SENSE-
V
SENSE+
I
+15%
OUTnom
I
OUTnom
I
-15%
OUTnom
0.15V
ADJ
is forced across internal resistor
SENSE
), the comparator output
ADJ
.
ADJ
. The current decays at a rate determined
IN
December 2010
© Diodes Incorporated
)
ADJ
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