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PDF SIC9653 Data sheet ( Hoja de datos )
| Número de pieza | SIC9653 | |
| Descripción | High Precision PSR Constant Current LED Driver | |
| Fabricantes | SI Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SIC9653 (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 Constant Current LED Driver
产品规格书
Product Specification
SIC9653
GENERAL DESCRIPTION
The SIC9653 is a high accuracy edge feedback LED constant current driver chip, suitable for 176 Vac
~ 265 Vac full range of input voltage, offering power under 7W flyback type isolation LED constant
current power supply.
The SIC9653 was built in a high precision of sampling and compensation circuit, enables the circuit to
achieve constant current accuracy around + / - 3%. It also has excellent linear regulation and load
regulation. Through the external RADJ pin, the resistor can easily control the LED open circuit protection
voltage.
The SIC9653 has internal integration for 650V power MOSFET, design as original double winding
feedback mode, it can work without secondary feedback circuit. It also doesn’t need the compensation
circuit. Combined with the precise and stable adaptive technology, it makes the system peripheral
structure very simple with few peripheral devices. The wide range of parameters makes it easy to
achieve high precision under condition of constant current control. Such design has greatly saving the
system cost and size. At the same time it can ensure the consistency of the LED lamps and lanterns
parameters during mass production.
The SIC9653 has many protection functions: output short circuit protection, sampling resistor
short-circuit protection, under-voltage protection and output over-voltage protection, over temperature
adaptive adjustment and etc.
FEATURES
· Internal integration 650V Power MOSFET
· ±3% LED Output Current Accuracy
· Original edge feedback constant current control,
without secondary feedback circuits
· Without auxiliary winding and power supply
· LED open-circuit voltage adjusted through
the external resistors
· Ultra-Low operating current
· Output short circuit protection
· Short open sampling resistance
· Output over-voltage protection
· Under-voltage protection
· Over-heat adaptive adjustment function
· Concise system topology with few peripheral
devices
· Wide range of input voltage
TYPICAL APPLICATION
Si semiconductors
- 1 - SIC9653_EN_Rev2.0
1 page  
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
High Precision PSR Constant Current LED Driver
产品规格书
Product Specification
SIC9653
Operating frequency of the system
The SIC9653 system operates under DCM mode. Without the loop compensation its maximum space
occupancy is 45%. In order to guarantee the operating stability of the system, the minimum working
frequency was limited internal the chip. The maximum operating frequency of the chip
recommendation is not to over than 100 KHZ. The system working frequency calculation formula goes
to below:
f
=
8×
N
2
P
×VLED
N
2
S
×
LP
×
I
LED
Note: LP is Transformer primary side inductance
Over voltage protection
When designing the system, the open circuit voltage can be determined by turn ratios to the
transformer. However, due to the various load requirements, different open circuit voltage protection
requirements have brought inconvenience for the design of the transformer. Through the adjustment of
an external resistor RADJ pin, the SIC9653 can achieved under the condition of reasonable design of
transformer. By adjusting the external resistor RADJ pin open circuit protection voltage, the SIC9653
can adjust system without changing the transformer. Such design can not only do great benefit to the
customer's system design, but also convenient for production and operations. Finally allows users to
obtain better efficiency and effectiveness.
In the system, when the LED is on the open condition, due to no load connection, the output voltage
will gradually rise, leading to the decrease of demagnetization time, therefore the RADJ through an
external resistor can control the corresponding demagnetization time. It can also get open circuit
voltage protection at the same time. Calculate according to the internal circuit, can draw RADJ
relations with VOVP formula goes as:
( )RADJ
≈
VISEN × LP ×16
RISEN × N PS ×VOVP
×106
Kohm
Note:
VISEN is ISEN turn off threshold value
LP is the original side inductance
RISEN is the sample resistance
NPS is the turns ratio of secondary side of transformer
VOVP is The set value of over voltage protection
Protection Function
The SIC9552 has a variety of protective functions such as the LED to open/short circuit protection, ISEN
resistance short-circuit protection, VDD over-voltage/under-voltage, temperature adaptive adjustment
and etc.
When the SIC9552 is working, it is able to monitoring the various working status automatically. When
the load turns to open, the circuit will enter a state of over-voltage protection, immediately shut the
internal MOSFET will be shut down immediately and the system runs into interval detection at the
Si semiconductors
- 5 - SIC9653_EN_Rev2.0
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SIC9653.PDF ] | |
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