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PDF SD6800TR Data sheet ( Hoja de datos )
| Número de pieza | SD6800TR | |
| Descripción | PRIMARY SIDE CONTROLLED LED CONTROLLER WITH PFC | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Silan
Microelectronics
SD6800_Datasheet
SINGLE STAGE PRIMARY SIDE REGULATION PFC CONTROLLER FOR LED
DRIVER
DESCRIPTION
The SD6800 is a single stage primary side regulation (PSR) power factor
correction (PFC) controller, specially designed for LED driver.
The Device adopts constant on time operation to achieve high power
factor.
The SD6800 provides accurate constant current control and operates in
boundary conduction mode (BCM) with high efficiency.
The Device adopts primary side regulation eliminating the opto-couple,
secondary feedback control and loop compensation for reducing design
and cost.
The SD6800 provides completed protections such as short LED
protection, open LED protection and over temperature protection, etc.
SOP-8-225-1.27
FEATURES
PSR Flyback topology
Boundary Conduction Mode
Low start current
Leading edge blanking
Constant on-time control
VCC over voltage protection
VCC under voltage lockout
Over temperature protection
Cycle by cycle current limiting
Peak current compensation
Short LED protection and Open LED protection
APPLICATIONS
LED lamp
LED illumination with AC input
ORDERING INFORMATION
Part No.
SD6800
SD6800TR
Package
SOP-8-225-1.27
SOP-8-225-1.27
Material
Halogen free
Halogen free
Packing
Tube
Tape & reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
http: //www.silan.com.cn
Rev.:1.3
Page 1 of 8
1 page  
Silan
Microelectronics
SD6800_Datasheet
2. Drive circuit
Drive circuit is power by VCC. When DR＝1, MOSFET is on; When DR＝0, MOSFET is off. TLEB＝0.75µs is set to
avoid the burr which will cause error at the turn-on transient of MOSFET.
3. Peak current detection and sample holding
When MOSFET is on, the primary current, which is detected by sense resistor, increases linearly. If this current
exceeds the threshold value 0.6V, the current limit comparator acts to turn off MOSFET and DR＝0.
When it is normal, primary peak current is Ipk, and the secondary diode on time is Toff1, hence, the output current is
given by:
Iout = 0.5 ⋅ n ⋅Ipk ⋅ Toff1 T
Where, n is the primary/secondary turns ratio.
Ipk ⋅ Toff1 T is calculated in integral mode, and Ipk ⋅ Toff1 T = Vcscc Rsen is realized through loop control.
Where, Rsen is the sense resistor.
That is,
Iout = 0.5 ⋅ n ⋅ Vcscc Rsen
The output of error amplifier COMP is used for control switch on time. When the on time is up, DR＝0, MOSFET is off.
4. Boundary Conduction Mode
The pin FB detects the voltage across the auxiliary winding by a resistor divider. When the secondary current turns to
zero, FB voltage starts to decrease. If FB voltage is decreased to 0.2V, the MOSFET would be turned on.
5. VCC over voltage protection and Open LED protection
The output voltage is reflected by the auxiliary winding voltage of the Flyback transformer, and both pin FB and pin
VCC provide over voltage protection function. When VCC voltage exceeds 23V, or FB voltage exceeds 1.46V, the over
voltage protection is triggered and the IC will discharge, VCC voltage start to decrease. If VCC voltage is decreased to
8V, the capacitor connected to pin VCC is recharged through start resistor. If the over voltage condition still exists, the
system will operate in hiccup mode.
6. Over Temperature Protection
If the circuit is over temperature, the output is shut down to prevent the circuit from damage. The over temperature
protection has the hysteresis characteristic. The temperature should be decreased lower than the threshold
temperature by 20°C for normal operation. This is adopted to avoid frequently change between normal and protection
modes.
7. LED Short-circuit protection
When LED is short-circuit and held for 768 periods, the protection acts and the circuit restarts after the protection.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
http: //www.silan.com.cn
Rev.:1.3
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SD6800TR.PDF ] | |
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