LD8116QLGL datasheet(10/13 Pages) LEADTREND

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LD8116QL

07/15/2020

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD8116QL-DS-00 July 2020

Application Information

Operation Overview

The LD8116QL is an excellent 3 in 1 dimming controller

for LED lighting applications. It integrates more

functions to reduce the external components counts and

the size. Its major features are described as below.

The LD8116QL convert input DC potential or PWM

signal into PWM output. The output is an open-drain

configuration which can pull down any source directly to

control power supply dimming. The DIM pin of

LD8116QL provides an adjustable bias current for

potentiometer. So it can satisfy with active and passive

dimmers both. It also can be used in isolation

application with opto-coupler.

Startup

and

Under

Voltage

Lockout

(UVLO)

An UVLO comparator is embedded to detect the voltage

on the VCC pin to ensure the supply voltage enough to

power on the LD8116QL. The turn on and turn off

threshold voltage is fixed at 7V and 6V. When the

voltage of VCC pin is above 6V, the LD8116QL output

PWM which is basing on input DC potential, PWM single

or potentiometer.

Bias Current of DIM Pin

ISET pin of LD8116QL is used to set bias current source

of DIM pin by a resistor (= RISET) on ISET pin which is

connected to GND. For the typical application, the

output bias current of DIM pin is 100μA when RISET is

100k ohm and 150μA when RISET is 66.5k ohm. The

relationship between resistor and output bias current is:

IDIM=

2.5V

× K

Where, KDIM is a coefficient of current ratio of IDIM per

ISET. The resistance range of RISET is recommend from

33k to 330k ohm and the range of bias current is

approach to 30μA ~ 300μA.

Dimming Performance

0~10V Potential Dimming

When the input signal of DIM pin is DC potential,

LD8116QL will transfer to PWM signal output at OUT

pin. The frequency of output PWM on OUT pin is 1.5kHz

around. The range of typical dimming curve is from 1.5V

to 8.6V, which has the corresponding duty cycle from

10% to 100%.

PWM Dimming ( Leadtrend ‘s patent )

During PWM signal input on the DIM pin, the output of

LD8116QL OUT pin is PWM, too. And the output

frequency is the same as 0-10V potential or

potentiometer dimming mode. The input amplitude of

PWM signal has to high level higher or equal to 3.2V

and low level less than 1.2V on DIM pin. Besides,

recommend PWM frequency range is from 500Hz to

10kHz and 1%~99% operation range. ICs PWM rising

slew rate of DIM pin is faster than 3 V/μs through 1.2V

to 3.2V and continuous 4 cycles, only in this way the

PWM dimming mode can operate. Then detection of

high and low voltage level on 1.8V and through LPF pin

filter from PWM to DC then compare internal triangular

wave. So, output duty cycle approaches input PWM

duty. Once it enters PWM dimming mode, dimming

mode will be kept until VCC is reset by UVLO_off. The

below is suggestion for filter capacitor on LPF pin

PWM signal frequency (Hz)

Suggested CLPF (nF)

500~3k

220

3k~10k

100

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