TS19820CS datasheet(5/14 Pages) TSC

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TS19820CS

Taiwan Semiconductor

Version: A1806

PIN FUNCTION DESCRIPTION

CS pin:

CS pin provides the LED current feedback function, IOUT and RS formula as below

Where :

●

RS is the resistance

●

0.2 is a V reference for electric potential

●

IOUT is the current output

Also, CS pin provides over-current protection (OCP), over-current ICS (Limit) and RS formula as below:

Where :

●

ICS(Limit) is a current sense

●

1 is a voltage value for OCP

●

RS is the resistance

DIM pin:

Output current modulation dimming can be controlled from either PWM or linear analog signal input on a dedicated

pin. The linear dimming range is an analog voltage from 0V to 1.6V. The PWM dimming range is larger than 2.5V .

PWM dimming control is a function of the duty cycle of external PWM signal.

COM pin:

The most important design is compensation circuit for PFC control loop. It achieves high PFC and low total

harmonic distortion (THD) function. In order to remain VCOM is a constant value in every cycle we usually set the

bandwidth under 10Hz. We recommend using 1μF capacitor in typ. design. If the system specification comes with

higher output voltage or large output capacitor, ensure the VCC voltage above UVL(off) .If not the system will fail to

start or blinking or flickering. VCOM level determine Switch-on time (tON). In order to avoid malfunction that

recommend operating range between 1μs ~ 14μs.

LDO pin:

Provide 3.3V to MCU power supply.

ZCDX pin:

Auxiliary Winding input for LDO power supply.

GND pin:

GND is the reference node of internal circuit.

OUTPUT pin:

OUT pin has internal built-in a voltage clamp circuit. 12.5V is the maximum clamping voltage, when VCC is over

12.5V which OUT pin will be clamped under 12.5V. This function is avoided the output voltage too high and

damaged the MOSFET gate

VCC pin:

VCC pin has built-in three levels. Such as :

Start voltage level (VCC_ON), Cutoff voltage level (VCC_OFF), Over-voltage protection level (VOVP).

When VCC voltage over VCC_ON level, IC will work in the system. When VCC voltage over OVP level (31.5V Typ.), IC

will shut down and goes into “Hiccup” mode. The IC operating between UVLO

(ON) and UVLO(OFF), 8 times per cycle

until the OVP condition is removed.

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