LD8116C datasheet(10/13 Pages) LEADTREND

10 / 13 page

LD8116C

05/05/2018

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD8116C-DS-00 May 2018

Application Information

Operation Overview

The LD8116C is an excellent 3 in 1 dimming controller

for

LED

lighting

applications.

integrates

functions to reduce the external components counts and

the size. Its major features are described as below.

The LD8116C convert input DC potential or PWM signal

into PWM output. The output of LD8116C is an

open-drain configuration which can pull down any

source directly to control power supply dimming. The

DIM pin of LD8116C provides an adjustable bias current

for potentiometer. So LD8116C 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 LD8116C. The turn on and turn off

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

voltage of VCC pin is above 6V, the LD8116C output

PWM which is basing on input DC potential, PWM single

or potentiometer.

Bias Current of DIM Pin

ISET pin of LD8116C 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. The relationship between resistor and output

bias current is:

IDIM=

2.5V

RISET

× KDIM

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.

Minimum Output Duty Cycle

When the input of DIM pin is DC potential, CLAMP pin of

LD8116C can be setting minimum output duty cycle by a

resistor (= RCLAMP) on CLAMP pin which is connected to

GND. There are four modes for user to select. Please

refer to the below table1.

The relationship between

resistor and voltage of clamp pin is:

VCLAMP=ICLAMP× RCLAMP=

2.5V

RISET

× KCLAMP× RCLAMP

Where, KCLAMP is a coefficient of current ratio of ICLAMP

per IISET.

VCLAMP (V)

Suggestion RCLAMP (Ω)

When RISET=100KΩ

Minimum output

Duty Clamping

< 0.5

0 (Short)

> 4.2

> 510k (Open)

No clamping

Table1: Minimum output duty cycles clamping Selection

Dimming Performance

0~10V Potential Dimming

When the input signal of DIM pin is DC potential,

LD8116C will transfer to PWM signal output at OUT pin.

The frequency of output PWM on OUT pin is 1.5kHz

around. Typical dimming curve is from 1.6V to 10.6V

transfer to 10~100% output duty.

PWM Dimming ( Leadtrend ‘s patent pending)

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

LD8116C OUT pin is PWM, too. And the output

frequency and duty of OUT pin is following the input

PWM frequency and duty directly. 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. And

recommend PWM frequency range is from 500Hz to

5kHz. ICs detect the PWM rising slew rate of DIM pin is

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