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PT4205 Datasheet Preview

PT4205 Datasheet

1.2A Step-down HB LED Driver

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PT4205
30V, 1.2A Step-down HB LED Driver
GENERAL DESCRIPTION
The PT4205 is a continuous conduction mode inductive
step-down converter, designed for driving single or
multiple serie connected LEDs efficiently from a
voltage source higher than the total LED chain voltage.
The device operates from an input supply between 5V
and 30V and provides an externally adjustable output
current of up to 1.2A. Depending upon the supply
voltage and external components, the PT4205can
provide more than tens of watts of output power.
The PT4205 includes the power switch and a high-side
output current sensing circuit, which uses an external
resistor to set the nominal average output current, and a
dedicated DIM input accepts either a DC voltage or a
wide range of pulsed dimming. Applying a voltage of
0.3V or lower to the DIM pin turns the output off and
switches the device into a low current standby state.
The PT4205 is available in SOT89-5 and ESOP8
packages.
ORDERING INFORMATION
FEATURES
Simple low parts count
Wide input voltage range: 5V to 30V
Up to 1.2A output current
Single pin on/off and brightness control using DC
voltage or PWM
Typical 3% output current accuracy
Inherent open-circuit LED protection
High efficiency (up to 97%)
Hysteretic Control: No Compensation
Adjustable Constant LED Current
Soft over temperature protection
ESOP8 package for large output power application
RoHS compliant
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
LED back-up lighting
Illuminated signs
PACKAGE
SOT89-5
TEMPERATURE ORDERING PART
RANGE
NUMBER
-40 oC to 85 oC
PT4205E89E
ESOP8
-40 oC to 85 oC
PT4205EESH
Note:
xxxxxX
Assembly Factory Code
Lot Number
TYPICAL APPLICATION CIRCUIT
TRANSPORT
MEDIA
Tape and Reel
1000 units
Tape and Reel
2500 units
MARKING
PT4205
xxxxxX
PT4205
xxxxxX
VIN
DC5-30V
AC12-
18V
RS
0.28Ω
D
LED
3W
L=47uH
54
CIN 100uF
VIN CSN
PT4205
SW GND DIM
1 23
China Resources Powtech (Shanghai) Limited
PT4205_DS Rev EN_1.2
WWW.CRPOWTECH.COM
Page 1




PowTech

PT4205 Datasheet Preview

PT4205 Datasheet

1.2A Step-down HB LED Driver

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PIN ASSIGNMENT
PT4205
30V, 1.2A Step-down HB LED Driver
CSN
VIN
SW
NC
18
27
36
45
ESOP8
DIM
NC
GND
NC
PIN DESCRIPTIONS
PIN No.
1
2
3
4
5
-
ESOP8 4,5,7
PIN
NAMES
SW
GND
DIM
CSN
VIN
Exposed PAD
NC
DESCRIPTION
Switch Output. SW is the drain of the internal N-Ch MOSFET switch.
Signal and power ground. Connect directly to ground plane.
Logic level dimming input. Drive DIM low to turn off the current regulator.
Drive DIM high to enable the current regulator.
Current sense input
Input Supply Pin. Must be locally bypassed.
Internally connected to GND. Mount on board for lower thermal resistance.
No connection
ABSOLUTE MAXIMUM RATINGS (note1)
SYMBOL
VIN
SW
CSN
DIM
ISW
PDMAX
PTR
PTR
TJ
TSTG
ESD(note3)
ITEMS
Supply Voltage
Drain of the internal power switch
Current sense input (Respect to VIN)
Logic level dimming input
Switch output current
Power Dissipation (Note 2)
Thermal Resistance, SOT89-5 (θJA)
Thermal Resistance, ESOP8 (θJA)
Operation Junction Temperature Range
Storage Temperature
HBM
VALUE
-0.3~40
-0.3~40
+0.3~(-6.0)
-0.3~30
1.5
1.5
45
40
-40 to 150
-55 to 150
2
UNIT
V
V
V
V
A
W
oC /W
oC /W
oC
oC
kV
China Resources Powtech (Shanghai) Limited
PT4205_DS Rev EN_1.2
WWW.CRPOWTECH.COM
Page 2


Part Number PT4205
Description 1.2A Step-down HB LED Driver
Maker PowTech
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PT4205 Datasheet PDF






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