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DT5508 -- High Efficiency Low EMI PSR No Aux-winding LED Driver

Issue Date: 2013-03-29
Description:

The DT5508 is a high precision PSR constant current convertor for lighting LED driver applications.  It operates in primary-side sense and regulation. Consequently, opto-coupler and TL431 could be eliminated. Moreover, The creative design of DT5508 makes it regulates the output current without any auxiliary windings or compensation circuitry, which drastically saving the cost and PCB space. The output current tolerance is as low as 3%. The DT5508 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, over voltage protection, feedback loop open protection, short circuit protection, under voltage lockout, thermal shutdown, etc. The DT5508 is available in SOP8 package.


GENERAL DESCRIPTION

The DT5508 is a high precision PSR constant current convertor for lighting LED driver applications.  It operates in primary-side sense and regulation. Consequently, opto-coupler and TL431 could be eliminated. Moreover, The creative design of DT5508 makes it regulates the output current without any auxiliary windings or compensation circuitry, which drastically saving the cost and PCB space. The output current tolerance is as low as 3%.

The DT5508 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, over voltage protection, feedback loop open protection, short circuit protection, under voltage lockout, thermal shutdown, etc.

The DT5508 is available in SOP8 package.

 

FEATURES

  • PSR sense, needless of the secondary sense and auxiliary winding.
  • ±3% output tolerance
  • Ultra-low operating current, high efficiency
  • 85VAC?64VAC input range
  • Built-in 0.5A power MOSFET
  • LED short/open circuit protection
  • Under voltage lockout
  • FB short/open circuit protection
  • CS short/open circuit protection
  • Thermal shutdown
  • No loop compensation needed
  • SOP8 package

APPLICATIONS

  • GU10/E27 LED bulb & spot light
  • PAR30 PAR38 LED bulb
  • Other LED lighting

 

TYPICAL APPLICATION CIRCUIT

 

PIN ASSIGNMENT

 

PIN DESCRIPTION

PIN No

SYMBOL

DESCRIPTTION

1

FB

Feed Back

2

VCC

Supply Input

3

CS

Current Sense

4

COM

Compensation Input

5,6

SW

Power MOSFET Output

7,8

GND

Ground

 

 

ABSOLUTE MAXIMUM RATINGS (Note 1)

Sym

Parameter

Range

Unit

VCC

Supply Voltage

-0.3?8

V

FB,COM

 

-0.3?.0

V

CS

 

-0.3?.0

V

SW

 

-0.3?8

V

PDMAX

Maximum Power consumption(Note2)

0.45

W

PTR

Thermal Resistance, SOP8(θJA?/p>

130

oC /W

TJ

Operating junction temperature

-40?50

oC

TSTG

Storage temperature range

-55?50

oC

Note 1: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. Under “recommended operating conditions” the device operation is assured, but some particular parameter may not be achieved. The electrical characteristics table defines the operation range of the device, the electrical characteristics is assured on DC and AC voltage by test program. For the parameters without minimum and maximum value in the EC table, the typical value defines the operation range, the accuracy is not guaranteed by spec.

Note 2: The maximum power dissipation decrease if temperature rise, it is decided by TJMAX, θJA, and environment temperature (TA). The maximum power dissipation is the lower one between PDMAX = (TJMAX - TA)/ θJA and the number listed in the maximum table.

 

RECOMMENDED OPERATION CONDITION

Symbol

Parameter

Range

Unit

VCC

Supply Voltage

10~14

V

fosc

Operating Frequency

20?0

KHz



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