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PT4225
1-5W Primary Side CC Regulator
GENERAL DESCRIPTION
The PT4225 is primary side constant current regulator,
which is designed for high performance and
cost-effective LED lighting applications. With
Powtechs proprietary constant current compensation
technique accurate output current regulation is achieved
without the need of a secondary feedback circuitry.
Integrated primary inductance compensation circuitry
provides accurate constant current operation despite
variations in primary inductance. Excellent EMI
performance is achieved with frequency jittering
function together with soft driving control at totem pole
gate drive output.
The device integrates a high voltage power switch, an
oscillator, a current sense circuit, CC control circuit. It
also features a complete set of integrated protection
functions to protect against all fault conditions
including output open/short circuit, line under-voltage,
and over temperature shut down.
The PT4225 is available in an SOP-7 package.
ORDERING INFORMATION
FEATURES
CC Without Secondary Feedback
Integrates 600V Power Switch
Inductance Compensation
Low Startup Current (<10µA)
Adjustable Primary Side Current limit
VCC/FB Over Voltage Protection
VCC/FB UVLO
Feedback Loop Open Circuit Protection
Over Temperature Protection
APPLICATIONS
Sub 5W LED lighting applications
PACKAGE
SOP-7Pb free
TEMPERATURE
RANGE
-40to 85
ORDERING PART NUMBER
PT4225ESOG
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
2500/Tape and Reel
MARKING
PT4225
xxxxxX
TYPICAL APPLICATION CIRCUIT
AC IN
C1
R1
R2 C2
D1
D3
R3
R4 R6
7 NC
4 CS
3 VCC
2 FB
C3
DRAIN 6
DRAIN 5
GND 1
T1
D2
C4 R5 DC out
China Resources Powtech (shanghai) Co. Ltd
PT4225_DS Rev EN1.1
WWW.CRPOWTECH.COM
Page 1

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PIN ASSIGNMENT
PT4225
1-5W Primary Side CC Regulator
GND 1
FB 2
VCC 3
CS 4
7 NC
SOP7
6 DRAIN
5 DRAIN
PIN DESCRIPTIONS
PIN No.
SOP7
7
4
3
2
1
5,6
PIN NAMES
NC
CS
VCC
FB
GND
DRAIN
DESCRIPTION
Not connected
Primary Side Current Sense Input
Power supply, the device is supplied by an auxiliary winding.
Feedback Winding Voltage Sense Input
Ground
Internal power switch output, drive primary winding
ABSOLUTE MAXIMUM RATINGS (note1)
SYM
PARAMETER
VALUE
UNIT
VCC
VCC pin Voltage
-0.3~35
V
VFBVCS
VDRAIN
Topt
FBCS pin Input Voltage
DRAIN pin Voltage
Operating Junction Temp. Range
-0.3~5
-0.3~600
-40 to 150
V
V
Tstg Storage Temp. Range
-55 to 150
ESD
RΘJA
HBM
SOP-7
2000
120
V
/W
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.
RECOMMENDED OPERATING RANGE
SYM
VCC
TA
PARAMETER
VCC pin Operating Voltage
Operating Ambient Temperature
VALUE
9.5~26
-20~85
UNIT
V
China Resources Powtech (shanghai) Co. Ltd
PT4225_DS Rev EN1.1
WWW.CRPOWTECH.COM
Page 2

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PT4225
1-5W Primary Side CC Regulator
ELECTRICAL CHARACTERISTICS
(TA=25, VCC=16Vunless specified otherwise)
SYMBOL
PARAMETER
TEST CONDITION
MIN TYP MAX UNIT
SUPPLY VOLTAGE (VCC)
ISTART
Start up current
VCC=13.0V
1 10 µA
VVCC_ON
VVCC_OFF
VVCC_Clamp
VVCC_OVP
IVCCQ
VCC turn on threshold
VCC minimum operating
voltage
VCC Clamp Voltage
VCC Over Voltage
Protection Threshold
VCC Supply Current
VCC Rising
VCC Falling
Icc=10mA
No switching
13.5 15 16.5
8.0 9.0 10.0
33
26 27.5 29
350 700
V
V
V
V
µA
FEED BACK VOLTAGE SENSE PIN (FB)
VFBMAX
FB Over Voltage Protection
2.4 2.5 2.6
V
VFBMIN
FB Minimum Voltage
0.8 V
IFB_OPEN
FB Open Loop Current
CURRENT SENSE INPUT PIN (CS)
-85 µA
VCS Current Limit Threshold
TLEB
Current sense Leading Edge
Blanking Time
Driver outputDRAIN
Ifb=0
490 500 510
250
mV
ns
RDS(ON)
On state resistance
VCC=16V
8 15
Ω
IDS
Off state leak current
VCC=0,VDS=600V
BVDS
DRAIN breakdown voltage VCC=0IDRAIN=250uA 600
PROTECTION
TSD
Thermal
Threshold
Shut
Down
150
1
µA
V
China Resources Powtech (shanghai) Co. Ltd
PT4225_DS Rev EN1.1
WWW.CRPOWTECH.COM
Page 3