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PDF SIC9801 Data sheet ( Hoja de datos )
| Número de pieza | SIC9801 | |
| Descripción | High Precision PSR APFC Isolated LED Driver | |
| Fabricantes | SI Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SIC9801 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
High Precision PSR APFC Isolated LED Driver
产品规格书
Product Specification
SIC9801
General Description
The SIC9801 is a high precision primary-side regulation isolated flyback controller with single-stage Active
PFC, specially designed for offline constant current LED lighting. The controller with on-chip PFC circuit
operates in CCM (Critical Conduction Mode) to achieve high power factor and reduce the power MOSFET
switching loss. The controller precisely control the LED current without secondary side sense and feedback
circuit including opto-coupler. It uses source driver architecture and pending internal charging circuit for low
primary side switching loss, ultra fast VDD start up and LED turn on.
The SIC9801 uses compensation method to achieve excellent line regulation, and it still can be tuned externally
for flexibility.The controller also has outstanding load regulation for driving wide range of LED numbers.
The SIC9801 offers rich protection functions to improve the system reliability, including LED short circuit
protection, LED open circuit protection, VDD over voltage protection, VDD under voltage protection, ISEN
resistor short circuit protection, ISEN resistor open circuit protection, cycle-by-cycle current limit and die
over-temperature protection.All the protection features are auto-recovery.
The SIC9801 is available in SOP-8 package.
Features
· Single-Stage Active PFC for High Power Factor and Low THD
. No Opto-Coupler Required
. Excellent Line and Load Regulation
. Gate Driver Structure for Improved Efficiency
. Ultra-Low Start up Current
. LED Short and Open Circuit Protection
. Transformer Saturation Protection
. VDD Over-voltage and Under-voltage Protection
. Auto Recovery
Typical Application
. Primary Side Control Constant Current Operation
. ±3% LED Current Accuracy
. Critical Conduction Mode Operation
. High Resistance Feedback Resistor for Improved Efficiency
. Ultra-Low Operating Current
. ISEN Resistor Short and Open Circuit Protection
. Cycle-by-Cycle Current Limit
. Over Temperature Protection
Si semiconductors
- 1 - SIC9801_EN_Rev1.0
1 page  
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
High Precision PSR APFC Isolated LED Driver
Applications Information
产品规格书
Product Specification
SIC9801
Functional Description：
The SIC9801 is a high precision primary-side regulation isolated flyback controller with single-stage Active
PFC, specially designed for offline constant current LED lighting,can achieve high power faction ,low THD and
high efficiency.
Start-up:
After system powered up, the VDD pin capacitor is charged up by the start up resistor. When the VDD pin
voltage reaches the turn on threshold, the internal circuits start working. The COMP pin voltage is pulled up to
1.5V quickly, then the SIC9801 starts the MOSFET driver. The system works at 10kHz frequency at the
beginning, the COMP voltage rises up gradually, and the transformer primary peak current also rises up. The
LED current hence achieves a soft start without overshoot. After the output voltage is built up, the VDD power
is supplied by the auxiliary winding.
Constant Current Control：
The SIC9801 uses compensation method to achieve excellent line regulation, and it still can be tuned externally
for flexibility. Output current is given by:
I OUT
VREF
2 RISEN
NP
NS
Where,
Np is turns of transformer primary winding;
Ns is turns of transformer secondary winding;
VREF is the internal reference voltage, typical is 200mV;
RISEN is current detection resistor.
Feedback Network：
The SIC9801 detect the output zero current through feedback network,the FB sense down threshold is set at
0.1V, Hysteresis voltage is 0.08V.The FB sense is also used to detect output OVP,threshold is 1.6V.
The ratio of FB upper resistor to lower resistor can be set :
RFBL
RFBL RFBH
1.6V
VOVP _ FB
NS
NA
Where,
RFBL:the lower resistor of the feedback network;
RFBH:the upper resistor of the feedback network;
VOVP:output over voltage setting point;
NS is turns of transformer secondary winding
The FB upper resistor can be set to around 300KΩ to improve the system efficiency. It is also used for fine
tuning the LED current line compensation.
Si semiconductors
- 5 - SIC9801_EN_Rev1.0
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SIC9801.PDF ] | |
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