Datasheet > ZXLD1366QET5TA

ZXLD1366QET5TA

更新时间： 2022-06-24 15:40:42

品牌	Logo	应用领域
美台 - DIODES		驱动
页数	文件大小	规格书
32页	1490K
描述
AUTOMOTIVE COMPLIANT HIGH ACCURACY 1A, 60V LED DRIVER

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ZXLD1366QET5TA 数据手册

ZXLD1366Q

Device Description

The device, in conjunction with the coil (L1) and current sense resistor (R_S), forms a self-oscillating continuous-mode buck converter.

Device Operation

(Refer to Figure 1 Block diagram and Figure 2 Operating waveforms)

V_IN

LX voltage

V_IN

Toff

t_OFF

Ton

t_ON

230mV

170mV

200mV

SENSE voltage

V_SENSE-

V_SENSE+

I_OUTnom+15%

I_OUTnom

Coil current

I_OUTnom-15%

0.15V_ADJ

Comparator

input voltage

V_ADJ

0.15V_ADJ

Comparator

output

Figure 2. Theoretical Operating Waveforms

Operation can be understood by assuming that the ADJ pin of the device is unconnected and the voltage on this pin (V_ADJ) appears directly at the

(+) input of the comparator.

When input voltage V_INis first applied, the initial current in L1 and R_Sis zero and there is no output from the current sense 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_INto ground, via R_S, L1 and the LED(s). The current rises at a rate determined by V_INand L1 to produce a voltage ramp (V_SENSE) across R_S.

The supply referred voltage V_SENSEis forced across internal resistor 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_ADJ), the comparator output 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_ADJ

When MN is off, the current in L1 continues to flow via D1 and the LED(s) back to V_IN. The current decays at a rate determined 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_ADJ, the comparator output

switches high again. This cycle of events repeats, with the comparator input ramping between limits of V_ADJ15%.

Switching Thresholds

With V_ADJ= V_REF, the ratios of R1, R2 and R3 define an average V_SENSEswitching threshold of 200mV (measured on the I_SENSEpin with respect

to V_IN). The average output current I_OUTnomis then defined by this voltage and R_Saccording to:

I_OUTnom= 200mV/R_S

Nominal ripple current is 30mV/R_S.

5 of 32

www.diodes.com

April 2018

ZXLD1366Q

Document number: DS37078 Rev. 2 - 2

1 2 3 456 7 8...32

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