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PDF SD6856TR Data sheet ( Hoja de datos )

Número de pieza SD6856TR
Descripción PRIMARY SIDE CONTROL SMPS FOR LED DRIVER
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SD6855/6_Datasheet
PRIMARY SIDE CONTROL SMPS FOR LED DRIVER
DESCRIPTION
SD6855/6 is a primary side control SMPS for LED driver with
accurate constant voltage, constant current (CV/CC) control
loop for high average efficiency and reliability. Using SD6855/6
for system design can reduce the component count without
using opto-coupler, secondary feedback control, and loop
compensation circuit, which will reduce the BOM cost.
The output voltage can be set by the feedback resistor and the
output current can be set by peak current sensing resistor within
a certain output power range, which can meet the requirements
SOT-23-6L
of different solutions for driving LEDs in series or in parallel.
SD6855 adopts an external driving transistor suitable for 1~5W
output power; SD6856 uses an external driving MOSFET
suitable for 5~7W output power; They are both available in
SOT-23-6L package.
APPLICATIONS
FEATURES
* Primary side control
* Low start-up current
* Leading edge blanking
* Pulse-Frequency Modulation(PFM)
* Overvoltage protection
* Undervoltage lockout
* Over temperature protection
* Cycle by cycle current limiting
* Open loop protection
* High voltage spotlight
* Bulb light
* PAR light
ORDERING INFORMATION
Part No.
SD6855TR
SD6855GTR
SD6856TR
SD6856GTR
Package
SOT-23-6L
Marking
6855
6855G
6856
6856G
Material
Pb free
Halogen free
Pb free
Halogen free
Packing
Tape&Reel
Tape&Reel
Tape&Reel
Tape&Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:0.4 2011.02.11
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SD6856TR pdf
SD6855/6_Datasheet
ISPpeak current in secondary winding, IPKpeak current in primary winding, nturns ratio of
primary/secondary windings.
So, under the condition of constant peak current, keeping TOFF1TOFF2TON can realize the constant
current output.
4. Over voltage protection
The output is shutdown if VFB exceeds the threshold VOVP and this state is kept for 18ms, then the circuit
restarts.
5. Over temperature protection
If the circuit is over temperature, the output is shut down to prevent the circuit from damage. The hysteresis
of over temperature protection is used to avoid frequently change between normal and protection modes.
The over protection threshold value is 140°C and hysteresis value is about 35°C. Hence, the circuit can be
normal until the temperature decreased to 105°C below.
6. Open loop protection
When transistor is on, if VFB>1V, the loop is open and open loop protection is active to shutdown the
output, which keeps for 18ms and then the circuit restarts.
7. PFM frequency setting
PFM frequency range is determined by the constant on time TON and constant-voltage loop off time. When off
time is TCVmax, the circuit works with no load and operating frequency value is minimum; when off time is TCVmin,
the circuit works with full load and operating frequency value is maximum.
According
to
the
formula:
PO
=
VO
IO
=
1
2
LmIPK
2
fS
η
Where, Lm—primary inductance, IPK—peak current in primary side, fs—operating frequency, η—efficiency.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:0.4 2011.02.11
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