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PDF TC62D902FG Data sheet ( Hoja de datos )
| Número de pieza | TC62D902FG | |
| Descripción | Offline Isolated AC/DC Flyback LED Controller built-in PFC | |
| Fabricantes | Toshiba | |
| Logotipo |  |
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TC62D902FG
TOSHIBA CD-MOS Integrated Circuit Silicon Monolithic
TC62D902FG
Offline Isolated AC/DC Flyback LED Controller built-in PFC
1. Overview
This product is an isolation type flyback mode LED
controller.
This device is controlling an average LED current from the
primary side current value and the bias side impulse-wave
of the transformer and the detection circuit of the
secondary side is unnecessary.
Then, this product has the active PFC function of the single
stage mode and the active bleeder pin to do triac dimmer
and realizes LED lighting with few components.
2. Application
Isolated AC/DC LED lighting
TC62D902FG
P-SOP8-0504-1.27-001
Weight : 0.07g（typical）
3. Features
The isolation type LED control with few components
The triac dimmable
Single stage mode PFC
The secondary side photo-coupler is unnecessary.
The bottom switch function for the efficiency and the noise modification
Detection functions
The VCC reduced voltage detection ( UVLO, Under voltage Lockout )
The VIN over-voltage detection ( VIN-OVD )
The sense resistor short detection at Start-Up ( SRSD )
The sense wiring open detection ( SWOD )
The over temperature detection ( OTD )
The output LED open detection ( OOD )
The output LED short detection ( OSD )
The over-current detection at the primary side ( OCD )
Package : P-SOP8-0504-1.27-001
© 2014 TOSHIBA Corporation
1
2014-10-01
1 page  
9. Absolute Maximum Ratings (Ta = 25°C)
Characteristics
Supply voltage
OREF terminal voltage
VSEN terminal voltage
VIN terminal voltage
BLDR terminal voltage
ISEN terminal voltage
GATE terminal voltage
Operating temperature
Storage temperature
Thermal resistance
Power dissipation
Symbol
VCC
VOREF
VVSEN
VVIN
VBLDR
VISEN
VGATE
Topr
Tstg
Rth(j-a)
PD
Rating Note1
−0.3~ 26
−0.3~ 6.0
−0.7~ 6.0
−0.3~ 6.0
−0.3~ VCC
−0.3~ 6.0
−0.3~VCC
−40~85
−55~150
105
1.19
TC62D902FG
Unit
V
V
V
V
V
V
V
°C
°C
°C/W
W
Remark
Note2
Note3
Note1: The voltage value is a ground standard.
Note2: Junction-to-ambient thermal resistance is highly application and board-layout dependent.
Note3: When ambient temperature is 25°C or more. Every time ambient temperature exceeded 1°C, please decrease 1/Rth(j-a).
Topr : the ambient air temperature of IC under operation.
Tj : It is the junction temperature of IC under operation.
Tj maximum is restricted by the TSD (thermal shutdown) circuit.
Tj maximum recommends carrying out a thermal design within the limit of a 120 °C
Cautions on absolute maximum ratings
The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment.
Do not exceed any of these ratings.
Exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or
combustion.
The value of even one parameter of the absolute maximum ratings should not be exceeded under any circumstances. This
device does not have over-voltage protection. Therefore, the device is damaged if a voltage exceeding its rated maximum is
applied.
All voltage ratings including supply voltages must always be followed. The section on the protection features on the
latter page should also be referred to.
5 2014-10-01
5 Page 
TC62D902FG
Switching Frequency of MOSFET)
The recommendation range of switch frequency fOSC is 30 - 200 kHz.
As explained by the function of the average LED current, it controls the pulse width tS of current IS at
the frequency in the standard. Roughly the following estimating is possible from the inductance
value LS, peak current IS(Peak) and the LED forward-voltage VF of the secondary.
Switch frequency fOSC = 1/(Secondary on time tS*(7/4))
= 1÷(Inductance of primary LS*Peak secondary current IS(peak)/VF of LEDs)*(7/4)
There is a following relation about the primary inductance LP and secondary inductance LS.
Primary inductance LP=Secondary inductance LS * Turn ratio Ntr^2
At this time, the primary inductance LP is big and recommends above 50μH.
Single state PFC)
This device does power-factor-improvement in making VIN terminal-voltage ISEN pin voltage
threshold and controlling an IP(Peak). Because the primary current is a discontinuity (DCM), it is
difficult for the power factor of the light-load to be high.
The power factor depends on the operating condition and it is possible for approximately and
PF=0.75~0.9 to be realized.
It inputs to the VIN pin voltage after doing AC voltage in the divide at the resistor.
This waveform becomes the voltage threshold of the ISEN pin voltage as gain 1. The VIN pin voltage
input-voltage-range is from 0V up to 1.8 V.
VIN
AC voltage in the divide at the resistor.
GATE
Primary
Current IP
ILED
Secondary
Current IS
Because the main system is single stage PFC, the LED current waveform of the secondary side
includes a ripple. To make LED current waveform smoother, it makes a secondary output capacitor
big. The GATE pin is modulating a frequency.
Remark)
This waveform is a function image and the actual waveform and the figure above
are sometimes different.
11 2014-10-01
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet TC62D902FG.PDF ] | |
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