TS19320CS
Taiwan Semiconductor
6 Version: A1602
APPLICATION INFORMATION
PSR Function Description
As a constant current primary-side controller with phase-cut dimmable and PFC function for LED lighting
applications, the controller operates in boundary conduction mode (BCM) with constant on-time based regulation
designed to achieve high power factor performance. The TS19320 has built-in high voltage (500V) startup circuit,
V
CC
over voltage protection, open LED protection, short LED protection, over temperature protection, primary-side
current limit, and gate clamp function.
The average output current can be expressed as below.
Where:
• I
OUT_avg
is the average output current
• N
P
is the primary-side turn ratio
• N
S
is the secondary-side turn ratio
• ƞ is the efficiency
• R
S
is the sensing resistor connected between the MOSFET source and the GND
Pin Definitions
HV Pin
Connect this pin to positive terminal of bulk capacitor to provide the startup current for the controller during V
CC_ON
trigger on before.
RT Pin
This pin is to program the maximum on time by connecting a resistor to ground. Reference formula as below.
CS Pin
MOSFET current signal sensing for multiplication and current limit setting function.
Where:
• I
CS(LIMIT)
is the input current sence
• R
S
is the sensing resistor connected between the MOSFET source and GND
COM Pin
This is the output of the g
m
amplifier. Connect with a suitable RC network to ground.
V
CC
Pin
Power supply for the controller during normal operation. The controller will start up when V
CC
reaches 15.3V (typical)
and will shut-down when V
CC
voltage is below 7.8V (typical). A decoupling capacitor should be connected between
the V
CC
and GND pin as close as possible.
The TS19320 performs V
CC
over voltage protection though V
CC
pin. Once V
CC
pin exceeds in 33.5V, TS19320 turns
off and latchs out the MOSFET switcher until V
CC
goes below V
CC_OFF
.
SS
P
OUT_avg
*0.370
N
I
×
×=
S
CS(LIMIT)
1.3
I =
( )
µ
1+−×= 100kR
14
T TON
