Document
TK5401 Application note
May,2009 Ver.1.2
TK5401 Application Note (Ver.1.2)
Takion Co.,Ltd http://www.takion.jp/
The contents in this document have a case to change without notice.
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TK5401 Application note
May,2009 Ver.1.2
Contents 1.General Description 2.Features 3.Block Diagram 4.Pin Functional Description 5.Package Outline 6.Electrical Characteristics 7.Power Supply IC Circuit Connection Example 8.Functional Description 8.1.Operating Oscillation 8.2.Power supply and Start-up Circuit 8.3.Constant Current Control Circuit 8.4.Adjustment Over Current Protection Circuit 8.5.COMP Pin Function 8.6.Latch Function 8.7.Thermal Shut Down Circuit 8.8.Over Voltage Protection Circuit 9.Application Circuit Example for LED Driver 9.1.Application Circuit Example 1 10.Attentions 3 3 3 4 4 5~7 7 8~9 9~10 11 12 13 13 13 14 15 16~18
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TK5401 Application note
May,2009 Ver.1.2
1.General Description
The TK5401 is a power supply IC for LED driver that had a characteristic to operate without electrolytic capacitors which is necessary for the DC power supply structure. The IC has the high voltage power MOSFET and the control circuit built-in one package. And it is realized miniaturization, low cost by removing electrolytic capacitors. Moreover, it is realized long operating life and high energy efficiency of LED lamp.
2. Features
●Built-in the high voltage power MOSFET(650V / 1.9Ω) ●Supports the universal AC input voltage(AC85V~AC265V) ●Supplies low power with built-in the start-up circuit ●PWM controls the power MOSFET at average oscillator frequency (67kHzTyp), feedback controls that assumed reference voltage (0.3VTyp) a standard to keep a fixed LED output current. Stop operating when a VCC voltage became less than Operating Supply Voltage. ●Over Voltage Protection / Thermal Shut Down(Stop operating by latch mode) ●Adjustable Over Current Protection ●Doing the input voltage monitor level in the 0V neighborhood by intermittent operation and operating repeatedly (In the case of the use to have power factor or dimming function, it is possible by adjustment of the voltage monitor)
3. Block Diagram
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TK5401 Application note
May,2009 Ver.1.2
4. Pin Functional Description
Pin # 1 2 3 4 5 7 8 Symbol S/OCP Vcc GND LS COMP D/ST Function Power MOSFET source connection Current limit sense Power supply voltage Ground LED output current sense Erramp output / Phase compensation Power MOSFET drain connection Input for start-up current
1 2 3 4
S/OCP VCC GND LS
D/ST 8 D/ST 7
COMP 5
Top View
5. Package Outline
<Marking>
R b Product name Lot number 1st letter 2nd letter 3rd letter c the last digit of year month week
Registration number
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Dimension
[mm]
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TK5401 Application note
May,2009 Ver.1.2
6. Electrical Characteristics
6.1. Absolute Maximum Ratings(Ta=25℃, unless otherwise noted) Parameter Peak Drain Current Single Pulse Avalanche Energy S/OCP Pin Voltage Power Supply Voltage LS Pin Voltage COMP Pin Voltage Power Dissipation (MOSFET) Power Dissipation (MIC) Storage Temperature Channel Temperature
Notes ※1 To Be Decided ※2 Mounted on board size 15mm×15mm, DIP8 package
Symbol IDpeak EAS ILpeak VOCP Vcc VLS VCOMP PD1 PD2 Tstg Tch
Ratings TBD TBD TBD -2~6 32 -0.3~6 -0.3~6 1.35 1.2 -40~+125 -20~+150
Unit A mJ A V V V V W W ℃ ℃
Conditions
Single pulse ※1 Single pulse ※1
※2 ※2
6.2. Electrical Characteristics of Power MOSFET(Ta=25℃, unless otherwise noted) Parameter Drain to Source Breakdown Voltage OFF-State Drain to Source Leakage Current Static Drain to Source On-Resistance Delay time Thermal Resistance (Channel to Case) Symbol VDSS IDSS RDS(ON) td θch-c Values MIN 650 ― ― ― ― TYP ― ― ― ― ― MAX ― 300 1.9 250 22 Unit V μA Ω ns ℃/W
※2
Conditions
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TK5401 Application note
May,2009 Ver.1.2
6.3. Electrical Characteristics of Control(Vcc=18V,Ta=25℃, unless otherwise noted) Parameter Symbol Values MIN 13.8 7.3 ― ― -3.7 8.5 ― TYP 15.3 8.1 ― TBD -2.5 9.5 TBD MAX 16.8 8.9 TBD ― -1.5 10.5 ― Unit
Conditions
●Power Source / Start-up Functions
Operating Supply Voltage Stop Supply Voltage (Undervoltage Lockout) Operating Circuit Current Start-up Supply Voltage Start-up Supply Current Supply Threshold Voltage Latch Keep Current
VCC(ON) VCC(OFF) ICC(ON) VST(ON) Istartup VCC(BIAS) ICC(LATCH)
V V mA V mA V μA
●Oscillator Functions
Average Oscillator Frequency
Oscillator Frequency modulation
fosc(ave) Δf Dmax TON(MIN)
60 ― 77 ―
67 5 83 540
74 ― 89 ―
kHz kHz % ns
Maximum On Duty Minimum On Time
●Over Current Protection Functions
Leading Edge Blanking Time Drain Peak Current Adjustment Value Drain Peak Current Adjustment Limit Duty OCP Threshold Voltage (at Zero On Duty) OCP Threshold Voltage (at 36% Duty)
TLEB DPC DDPC VOCP(L) VOCP(H)
― ― ― 0.70 0..