TS19340CS14 USER MANUAL

A1605

PIN DESCRIPTION

PIN NO. NAME FUNCTION

1 VD 3.3V low drop out voltage

2 CCH Constant current high limit voltage

3 CCL Constant current low limit voltage

4 CCO LED current cut-off voltage

5 PWM PWM input pin

6 N/C No connection

7 GND Ground

8 COM PWM pulse filter pin

9 SWO Open drain output of the comparator for LED current cut-off function

10 N/C No connection

11 PHO Open drain output of the two internal operational amplifier for photo coupler

12 VSEN Current sense pin

13 FB Voltage sense pin

14 VCC Power supply pin

1

2

3

4

14

SOP-14

VA

CCH

CCL

CCD

5

6

7

PWM

NC

VG

20

19

18

16

15

17

VCC

FB

VSEN

PHO

NC

SWO

COM

FUNCTION BLOCK DIAGRAM

BG LDO VD

VSEN

CCV(200mV)

FB

CVV(2.5/1.2)

CCL

CCH

BiasVCC

PHO

GND

DimCCO

PWM

COM

SWO

Function Description • CC / CV Controller • PWM / Linear Dimming • LED Current Cut-Off Function • High Accuracy Internal

Reference Voltage • Built-in 3.3V LDO

PIN DETAIL DESCRIPTION – PWM PIN & COM PIN

1000 PWM Duty (%)

COM

3.2V

50

1.6V

Level Shifter &

FilterPWM COM

PWM Duty Change to DC Level

Duty 100%~0%

3.2V~0V

PIN DETAIL DESCRIPTION – CCH / CCL / CCD

CCH Constant current high limit voltage CCL Constant current low limit voltage CCO LED Current Cut Off Voltage SWO Open drain output of the comparator for LED current cut-off function For VSENSE Reference Voltage COM > CCH VSENSE Reference Voltage = CCH / 16 CCH ≧ COM ≧ CCL VSENSE Reference Voltage = COM / 16 CCL > COM VSENSE Reference Voltage = CCL/ 16 For FB Reference Voltage COM & CCH > CCO FB Reference Voltage = 2.5V COM or CCH < CCO FB Reference Voltage = 1.2V

SWO FUNCTION @ LINEAR DIMMING

CH1Vout CH2SWO CH3PWM CH4Iout

COM & CCH > CCO SWO Pull High COM or CCH < CCO SWO Pull Low

CCO = 150mV (about 4.5%) PWM = 10% 0% CCH = VD (3.3V) SWO= H L

CCO = 150mV (about 4.5%) PWM = 0% 10% CCH = VD (3.3V) SWO= L H

SWO FUNCTION @ LINEAR DIMMING

CH1Vout CH2SWO CH3CCH CH4Iout

COM & CCH > CCO SWO Pull High COM or CCH < CCO SWO Pull Low

CCO = 150mV PWM = VD (3.3V) CCH = 200mV 0mV SWO= H L

CCO = 150mV PWM = VD (3.3V) CCH = 0mV 200mV SWO= L H

LED OPEN TEST

PWM Duty = 100% LED Open Iout = 200mA 0mA

WM Duty = 10% LED Open Iout = 200mA 0mA

CH1Vout CH2SWO CH3PWM CH4Iout

VCC

GND

FB VSEN

PWMCCL

PHO

Flyback or LLC or ...

CCOVD CCH

Photo coupler

SWO COM

3.3V LDOFor

MCU/CCH/CCL/CCO

Level

Photo coupler

For special function

CCHLevel

or VD

CCLLevel

or GND

CCOLevel

or GND

MCU

PWM InputDuty 0%~100%

VLED

VCC

PWMDimming

Secondary SidePrimary Side

APPLICATION CIRCUIT DIAGRAM – PWM DIM

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=VD=3.3V

PWMDimming

CCO=GND=0V

CCL=GND=0V

PWM DIMMING CURVE – EXAMPLE 1

1000 PWM Duty (%)

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

0 3.2 COM (V)

LED Dimming Curve

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=VD=3.3V

CCL=3.2V x 10%

PWMDimming

CCO=GND=0V

1000 PWM Duty (%)

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

0 3.2 COM (V)

20mV / 10%

CCL = 3.2V x 90%

LED Dimming Curve

PWM DIMMING CURVE – EXAMPLE 2

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=VD=3.3V

PWMDimming

CCO=3.2V x 3%

CCL=GND=0V

1000 PWM Duty (%)

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

0 3.2 COM (V)

6mV / 3%

LED Dimming Curve

CCO = 3.2V x 3%

PWM DIMMING CURVE – EXAMPLE 3

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=3.2V x 90%

PWMDimming

CCO=3.2V x 3%

CCL=3.2V x 10%

1000 PWM Duty (%)

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

0 3.2 COM (V)

180mV / 90%

20mV / 10%

CCH = 3.2V x 90%CCL = 3.2V x 90%

LED Dimming Curve

CCO = 3.2V x 3%

PWM DIMMING CURVE – EXAMPLE 4

CCH / CCL / CCO Setting

PWM DIMMING CURVE – REAL DESIGN 1

CCH / CCL / CCO Setting

0

40

80

120

160

200

0 20 40 60 80 100

ILED

(m

A)

PWM Duty(%)

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=VD=3.3V

PWMDimming

CCO=GND=0V

CCL=GND=0V

PWM Dimming Frequency = 1KHz

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCH=3.0V

PWMDimming

CCO=147mV

CCL=300mV

0

40

80

120

160

200

0 20 40 60 80 100

ILED

(m

A)

PWM Duty(%)

PWM DIMMING CURVE – REAL DESIGN 2

CCH / CCL / CCO Setting

PWM Dimming Frequency = 1KHz

APPLICATION CIRCUIT DIAGRAM – LINEAR DIM

Photo coupler

3.3V LDOFor

MCU/CCL/CCO

Level

Secondary Side

For special function

CCLLevel

or GND

CCOLevel

or GND

VD

VLED

VCC

Analog Input3.2V~0V

MCUorVR

LinearDimming

Flyback or LLC or ...

Photo coupler

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

Primary Side

0 CCH (V)

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

3.2Linear Dimming

LED Dimming Curve

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCO=GND=0V

CCL=GND=0V

VD=3.3VLinearDimming3.2V~0V

LINEAR DIMMING CURVE – EXAMPLE 1

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCO=GND=0V

VD=3.3VLinearDimming3.2V~0V

CCL=3.2V x 10%

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

0 3.2

20mV / 10%

CCL = 3.2V x 90%

LED Dimming Curve

CCH (V)Linear Dimming

LINEAR DIMMING CURVE – EXAMPLE 2

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

VD=3.3VLinearDimming3.2V~0V

CCL=GND=0V

CCO=3.2V x 3%

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

6mV / 3%

LED Dimming Curve

CCO = 3.2V x 3%

0 3.2 CCH (V)Linear Dimming

LINEAR DIMMING CURVE – EXAMPLE 3

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

VD=3.3VLinearDimming3.2V~0V CCO

=3.2V x 3%

CCL=3.2V x 10%

VSEN Reference Voltage / LED Current Ratio

200mV / 100%

180mV / 90%

20mV / 10%

CCL = 3.2V x 90%

LED Dimming Curve

CCO = 3.2V x 3%

0 3.2 CCH (V)Linear Dimming

LINEAR DIMMING CURVE – EXAMPLE 4

CCH / CCL / CCO Setting

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

CCO=GND=0V

CCL=GND=0V

VD=3.3VLinearDimming3.2V~0V

LINEAR DIMMING CURVE – REAL DESIGN 1

Linear Dimming Voltage = 3.2V~0V

CCH / CCL / CCO Setting

0

40

80

120

160

200

0 0.5 1 1.5 2 2.5 3

ILED

(m

A)

CCH Linear Dimming (V)

VCC

GND

FB VSEN

PWMCCL

PHO

CCOVD CCH

SWO COM

VD=3.3VLinearDimming3.2V~0V CCO

=507mV

CCL=1030mV

LINEAR DIMMING CURVE – REAL DESIGN 1

Linear Dimming Voltage = 3.2V~0V

CCH / CCL / CCO Setting

0

40

80

120

160

200

0 0.5 1 1.5 2 2.5 3

ILED

(m

A)

CCH Linear Dimming (V)

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