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PT4203
Primary Side CC Regulator for LED driver
DESCRIPTION
PT4203 is targeted to below 10W LED lighting
applications. It is designed for the flyback topology, and
regulates output current without the secondary feedback loop.
The PT4203 provide accurate CC (constant current)
regulation with built in compensation circuitry. Integrated line
and primary inductance compensation ensures output current
free of line voltage and primary inductance variations.
Complete protection functions have been integrated
allows PT4203 to protect against all fault conditions including
cycle by cycle current limit, output open/short circuit, line
under-voltage, and over temperature shut down.
PT4203 is available in SOT23-5 package.
FEATURES
z CC Control Without Secondary Feed back
z Compensates transformer Inductor Variation
z Compensates Line Voltage Variation
z Drive NPN or DNMOS
z Output Over Voltage Protection
z Output Short Circuit Protection
z Feedback resistor open circuit protection
z Line Under Voltage Protection
z Cycle by Cycle Current Limit
z Over Temperature Protection
APPLICATIONS
z 1-10W LED Power Supplier
ORDERING INFORMATION
PACKAGE
SOT23-5
TEMPERATURE
RANGE
-40to 85
ORDERING PART NUMBER
PT4203E23E
TRANSPORT
MEDIA
Tape and Reel
MARKING
4203
TYPICAL APPLICATION CIRCUIT
华润矽威科技(上海)有限公司
PT4203_DSB Ver. EN0.1
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PIN ASSIGNMENT
PT4203
Primary Side CC Regulator for LED driver
PIN DESCRIPTIONS
NO.
1
2
3
4
5
PIN
NAME
SW
GND
FB
VCC
START
DESCRIPTION
Internal switch driver outputconnects to the source
of MOSFET
System ground
Feedback Winding Voltage Sense Input
DC power supply pin, must be locally bypassed
Start up control pin, connects to the gate of the
MOSFET, must be locally bypassed
ABSOLUTE MAXIMUM RATINGS (note 1,2,3)
SYMBOL
VCC
START
SW
FB
PDMAX
PTR1
TJ
TSTG
HBM
PARAMETER
VCC supply voltage
START input voltage
SW output voltage
FB input voltage
Power dissipation (note 2)
Heat resistance R θJA
Junction temperature
Storage temperature
ESD sensitivity level (note 3)
VALUE
-0.3~6
-0.3~15
-0.3~30
-0.3~6
0.27
250
-40 to 150
-55 to 150
3
UNIT
V
V
V
V
W
oC /W
oC
oC
kV
RECOMMENDED OPERATING CONDITION
SYMBOL
VCC
TOPT
PARAMETER
supply voltage
Operating ambient temperature
VALUE
5.5
-40 to +85
UNIT
V
oC
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Recommended
Operating Range indicates conditions for which the device is functional, but do not guarantee specific performance
limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Range. Specifications are
not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device
performance.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA,
and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA)/ θJA or the
number given in Absolute Maximum Ratings, whichever is lower.
Note 3: Human body model, 100pF discharged through a 1.5kresistor.
华润矽威科技(上海)有限公司
PT4203_DSB Ver. EN0.1
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PT4203
Primary Side CC Regulator for LED driver
ELECTRICAL CHARACTERISTICS
(TA=25, Vcc=5.5Vunless specified otherwise)
SYMBOL
PARAMETER
TEST CONDITION
VCC Supply and Start up (VCC and START)
VSTART_ON
START on threshold
START rising
VSTART_OFF START off threshold
START falling
VSTART_CLMP START clamp voltage
VCC
VCC operating voltage
I(VSTART)=5mA
VCC_CLMP VCC clamp voltage
I(VCC)=5mA
VCC_UVLO
VCC UVLO threshold
ICH VCC charge current
FeedbackFB
VCC falling
VCC=0VVsw=20V
VFBMAX
FB over voltage threshold
VFBMIN
FB minimum voltage
IFB_OPEN
FB open loop protection
threshold
OSCILLATOR
Fosc
Dither_OSC
Oscillator frequency
Oscillator
frequency
modulation ratio
FB=2.25V,
IFB×Ton=1.5mA*uS
TJ=25
DMAX
Maximum duty cycle
Driver outputSW
RDS(ON)
SW On state resistance
TJ=25
Protection
ILIMIT
TLEB
TSD
TSDHYS
TAR_ON
SW peak current
Leading edge blanking time
di/dt=100 mA/us
Over temperature shut down
threshold
Over temperature shut down
hysterises
Fault condition restart time
MIN TYP MAX UNIT
9 11 13 V
5.5
7.5 9.5
V
11.5 13 14.5 V
6V
6.5 V
4.0 4.5 5
V
-7.5 -5 -2.5 mA
2.25 2.5 2.75 V
0.50 V
-120 uA
60 65 70 kHz
±7 %
60 %
3.5 5
381 410 438 mA
300 ns
150
50
4S
华润矽威科技(上海)有限公司
PT4203_DSB Ver. EN0.1
第 3页