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TS19705CX6RFG Datenblatt(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

Teilenummer TS19705CX6RFG
Bauteilbeschribung  Single-Stage PFC Primary-Side-Regulation LED Driver
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Hersteller  TSC [Taiwan Semiconductor Company, Ltd]
Direct Link  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS19705CX6RFG Datenblatt(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
4/7
Version: B14
Application Information
Function Description
The TS19705 is a constant current Fly-back controller with primary side control and PFC function for LED lighting
applications. The controller is Boundary Conduction Mode (BCM) operation with constant on time based regulator
design to achieve high power factor performance.
The TS19705 has built-in VCC over voltage protection, open LED protection, short LED protection, over temperature
protection, primary side current limit and gate clamp functions.
The average output current can be expressed as below.
Where :
 I
O_avg is the average output current
 N
P is the primary-side turn ratio
 N
S is the secondary-side turn ratio
 R
S is the sensing resistor connected between the MOSFET source and the GND
Pin Detail
Compensation
This is the output of the gm amplifier. Connect with a suitable RC network to ground.
Ground
GND is the reference node of internal circuit.
Current Sense
MOSFET current signal sensing for multiplication and current limit setting function.
Where :
ICS is the input current sence
RS is the sensing resistor connected between the MOSFET source and GND
Output
Gate drive for external MOSFET switch and is built-in gate clamp function.
VCC
Power supply for the controller during normal operation. The controller will start up when VCC reaches 18V (typical)
and will shut-down when VCC voltage is below 9.5V (typical). A decoupling capacitor should be connected between
the VCC and GND pin as close as possible.
The TS19705 performs VCC over voltage protection though VCC pin. Once VCC pin exceeds in 32V, TS19705 turns
off and latchs out the MOSFET switcher until VCC goes below VCC_OFF.


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