SIC9553A [SISEMIC]
High Precision Non-Isolated Buck LED Driver;
| 型号： | SIC9553A |
| 厂家： | 
Shenzhen SI Semiconductors Co.,LTD. |
| 描述： | High Precision Non-Isolated Buck LED Driver |
| 文件： | 总9页 (文件大小：583K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
General Description
The SIC9552A/9553A/9554A/9555A/9556A are high precision buck LED drivers. The chips are suitable for
85~265Vac universal input LED lighting applications.
The SIC9552A/9553A/9554A/9555A/9556A integrate high-precision sampling and compensation circuit, the
constant current of circuit can achieve accuracy under ± 3%. It can also achieve the adaptive demand between
both output inductor current and output voltage, so as to achieve good linear regulation and load regulation.
The SIC9552A/9553A/9554A/9555A/9556A integrate 500V power MOSFET. The simple peripheral structure
of the system can be benefit from its precise and stable adaptive technology. It is able to work without secondary
feedback circuitry or compensation circuitry. The SIC9552A/9553A/9554A/9555A/9556A can achieve precision
constant current control under a small number of peripheral devices and loosen parameter conditions. Such
features can greatly save both cost and size of the system. At the same time, it can ensure the consistency of
parameters when making mass production of LED lighting devices.
The SIC9552A/9553A/9554A/9555A/9556A have extensive protection features, including LED open protection,
LED short protection, current sampling resistor short protection, VDD under-voltage protection, over-temperature
protection.
Features
· Internal 500V Power MOSFET
· Ultra Low Operating Current
· Cycle-by-Cycle Current Limit
· LED Open Protection
· No Auxiliary Winding
· LED Short Protection
· ±3% LED Output Current Accuracy
· Inductor Current Critical Continuous Mode
· Excellent Line and Load Regulation
· Current Sampling Resistor Short Protection
· VDD Under-Voltage Protection
· Over Temperature Protection
Typical Application
SIC955XA
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 1 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
Ordering Information
Part Number
Package
Package Method
Marking
Si
9552A
XXXXXX
Tape
3,000pcs/Roll
Tape
SIC9552A（SOP-8）
SOP-8
Si
9553A
SIC9553A（SOP-8）
SIC9553A（DIP-7）
SIC9554A（SOP-8）
SIC9554A（DIP-7）
SIC9555A（DIP-7）
SIC9556A（DIP-7）
SOP-8
DIP-7
SOP-8
DIP-7
DIP-7
DIP-7
3,000pcs/Roll
Tube
XXXXXX
Si
SIC9553A
XXXXXX
50pcs/Tube
Si
9554A
XXXXXX
Tape
3,000pcs/Roll
Tube
Si
SIC9554A
XXXXXX
50pcs/Tube
Si
Tube
SIC9555A
XXXXXX
50pcs/Tube
Si
Tube
SIC9556A
XXXXXX
50pcs/Tube
Pin Assignment
SOP-8 Products
“Si”-Logo of SI Semiconductors
MMMM--Part Number
XXXXXX--Date Code
DIP-7 Products
“Si”-Logo of SI Semiconductors
MMMM--Part Number
XXXXXX--Date Code
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 2 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
Pin Description for SOP-8
Pin
1
Pin Name
GND
Description
Ground.
Over voltage protection Pin. The pin is used for output current
control.
2
3
RADJ
NC
No Connection. Suggest connected to GND.
Power Supply Pin. This pin supplies current to the internal start-up
circuit. This pin must be bypassed with a capacitor nearby.
4
VDD
5
6
7
8
DRN
ISEN
DRAIN of the MOSFET.
Output Current Sense Pin. The pin is used for output current control.
Pin Description for DIP-7
Pin
Pin Name
Description
Ground.
1
GND
Over voltage protection Pin. The pin is used for output current
control.
2
3
4
RADJ
NC
No Connection. Suggest connected to GND.
Power Supply Pin. This pin supplies current to the internal start-up
circuit. This pin must be bypassed with a capacitor nearby.
VDD
5
6
DRN
DRN
DRAIN of the MOSFET.
7
ISEN
Output Current Sense Pin. The pin is used for output current control.
Recommended Operation Conditions
Products
Symbol
Range
Unit
Products
ILED
ILED
ILED
ILED
ILED
ILED
ILED
ILED
ILED
ILED
1
2
1
2
1
2
1
2
1
2
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
Vin 220V±20%
155@VOUT=80V
255@VOUT=36V
225@VOUT=80V
330@VOUT=36V
360@VOUT=80V
400@VOUT=36V
400@VOUT=80V
490@VOUT=36V
500@VOUT=80V
550@VOUT=36V
SIC9552A
mA
SIC9553A
SIC9554A
SIC9555A
mA
mA
mA
SIC9556A
VLED min.
mA
V
VMIN
>15
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 3 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
Absolute Maximum Ratings
Parameter
Voltage On Pin VDD
Voltage On Pin VDRN
Voltage On Pin VISEN
Maximum Operation Current
Voltage On Pin VRADJ
Maximum Power Dissipation
(Ta=25oC)
Symbol
VDD
Parameter Range
-0.3-20
Unit
V
VDRN
VISEN
IDDMAX
VRADJ
-0.3-500
-0.3-6
V
V
5
mA
V
-0.3-6
0.45@SOP-8
0.90@DIP-7
145@SOP-8
80@DIP-7
-40-150
W
Ptot
Thermal Resistance
Junction-ambient
Rthj-a
℃/W
Operating Junction Temperature
Storage Temperature Range
ESD
TJ
℃
℃
V
TSTG
-55-150
2,000
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Exposure
to Absolute Maximum Rating conditions for extended periods may affect device reliability。
Electronic Characteristics
VDD = 15V & TC =25oC , unless otherwise specified
Parameter
VDD Clamp Voltage
Symbol
VDD_CLP
IDD
Test Conditions
0.8mA
Min
Typ
Max
17.2
135
14.2
195
9.1
Unit
V
15.8
Operating Current
FSYS=65KHz
VDD Rising
μA
V
VDD Start-up Threshold
Start-up Current
VST
12.8
IST
VDD=VST - 1V
VDD Falling
μA
V
VDD Turn Off Threshold
Internal Reference Voltage
Threshold for peak current
limit while Output short
Leading Edge Blanking Time
for Current Sense
VUVLO
VISEN
8.1
392
400
198
408
mV
VISEN_SHT
TLEB
Output Short
mV
ns
500
Switch Off Delay time
Breakdown Voltage
SIC9552A
TDELAY
150
530
14.0
9.0
ns
V
BVDSS
VGS=0V/ IDS=250uA
VGS=15V/ IDS=0.5A
VGS=0V/ VDS=500V
500
16.0
10.0
6.0
SIC9553A
MOSFET
SIC9554A
RDS(ON)
RDS(ON)
5.5
Ω
SIC9555A
2.8
3.5
SIC9556A
1.7
2.2
Drain Leakage Current
Voltage for Pin RADJ
IDSS
0.5
μA
V
VRADJ
0.55
45
Maximum On time
TON_MAX
TOFF_MAX
TOFF_MIN
TREG
μs
μs
μs
℃
Maximum Degaussing time
Minimum Degaussing time
Over-temperature Protection
255
5
155
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 4 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
Functional Block Diagram
APPLICATION INFORMATION
Function Description:
The SIC9552A/9553A/9554A/9555A/9556A are constant current driver chips dedicated for LED Lighting
applications. The chips integrate 500V power MOSFET which work under CRM mode. The chips are able to fit
in all working voltage range with excellent linear adjustment rate, load regulation and constant-current
characteristics. With very few external components, the converter achieves excellent constant current control. It
does not need auxiliary winding for powering the IC or voltage sensing, hence the system size and cost is greatly
reduced.
Start Up
The starting current of the chips is very low, after the system is powered on, VDD starting resistance start charge
the capacitance. When the VDD reach the open threshold range, the circuit begins to work. When the chips are
under normal operation condition, the internal circuit of the electric current can be as low as 135μA, and internal
system can offer an unique power mechanism. Thus, power supply can run normally without auxiliary winding
supply.
Sampling resistance and constant current control
The chips work under the CRM mode, and it has a reference voltage of 400mv inside. The reference voltage and
inductance in the system compares the original edge peak current calculation. Through the adjustment of the
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 5 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
sampling resistance, it is able to achieve the current control of LED driver:
400
ILED
=
mA
2RISEN
Note: ILED is the LED drive current
RISEN is the Sample resistance
Inductor Selection
The chips work under CRM mode, when the circuit electrical pulse output is on control. Internal MOSFET will
continue to work in conduction/closed. When the internal MOSFET starts, inductance will begin to conduct,
energy also starts storage. Until reaching the peak current, internal MOSFET stopped and the inductance of the
conduction time goes to:
400
L× IP
；
mA TON =
IP =
RISEN
VIN −VLED
Note: IP is the inductor current peak
L is the inductance
VIN is the DC value of the rectified AC input
VLED is the LED load of positive pressure drop
When the internal MOSFET turned off, inductor current will gradually decrease from the peak value, after it
reduced to zero, the internal MOSFET will start to work again. The inductance of the closing time goes to:
L× IP
TOFF
=
VLED
In summary, the inductance can be calculated as below:
VLED ×(VIN −VLED )
L =
VIN × IP × F
The working frequency of the system is F. When designing the system, the first value should be determined is
ILED, and then goes to RISEN, IP, and other values are identified accordingly. From this formula, the system
frequency is proportional to the input voltage, and is inversely proportional to the inductance L: when the input
voltage value is the minimum or inductance value is high, the system frequency is low; when the input voltage is
the highest or inductance value is low, the system frequency is higher. Thus, if the input voltage range of the
system is determined, inductance values can have directly effect to the system frequency range and also the
characteristics of constant current. Having considered that the system frequency can not be too low (e.g., over
with the audio range), or too high (resulting in too much loss of the power MOSFET and against EMI effect),
the chips also set a minimum and maximum off time. Therefore, when designing the system, the recommended
frequency is recommended to set among the range of 50 KHZ to 100 KHZ.
Over Voltage Protection
In the system, when the LED circuits are open, since there is no load connection, the output voltage will
gradually rise, leads to the decrease of demagnetization time. Therefore the corresponding demagnetization time
can be controlled by RADJ external resistor, and then the open circuit voltage protection become easy to realize.
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 6 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
According to the internal circuit, the relation between RADJ and VOVP can be draw as below:
VISEN × L×15
RADJ
≈
×106 (Kohm)
RISEN ×VOVP
Note: VISEN is ISEN turn off threshold
L is inductance value
RISEN is Sample resistance
VOVP is over voltage protection value
Protection Function
The chips have a variety of protective functions such as the LED to open/short circuit protection, ISEN resistance
short-circuit protection, VDD over-voltage/under-voltage, Over heat temperature adjustment and etc.
When the chips 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 off the internal MOSFET and
the system runs into interval detection at the same time. After the recovery of the failure, circuit will
automatically return to normal working state; if Load circuit runs into short situation, the system will work at
around 5 KHZ state of low frequency, low power consumption, constantly monitoring the system at the same
time. After the load circuit is back to normal condition, the circuit will also resume back to normal working
status; In the situation of ISEN resistance short-circuit, or other failure such as inductor saturation, fast protection
mechanism circuit will immediately stop the MOSFET switching action. Working circuit power supply will also
be declined, at this point, when UVLO circuit is triggered, the system will also restart. In summary, such design
can realize the protection function of trigger and restart working mechanism.
The chips integrate Over temperature regulation function. When the system is over temperature, the output
current is gradually reduced; the output power and thermal dissipation are also reduced. The system temperature
is regulated and the system reliability is improved. The thermal regulation temperature is set to 155℃ internally.
PCB Layout
Please followed the following rules in the SIC9552A/9553A/9554A/9555A/9556A PCB layout:
1. It’s very critical for VDD bypass capacitor,should be as close as possible to VDD and GND pin.
2. The area of main current loop should be as small as possible to reduce EMI radiation, such as the inductor,
the output diode and the bus capacitor loop.
3. The power ground path should be separated from small signal ground path and shorten the distance with the
capacitance.
4. RADJ external resistance should be as close as possible to RADJ pin, and connected to the ground.
5. The NC pin(Pin3) should be connected to GND (Pin1), and the RADJ external resistance should be
surrounded by the GND if possible.
6. DRN pin (PIN5, PIN6) apply copper area should be as large as possible for better thermal dissipation.
However too large copper area may compromise EMI performance.
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 7 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
SOP-8 封装机械尺寸
SOP-8 MECHANICAL DATA
单位:毫米/UNIT：mm
符号
最小值
典型值
最大值
符号
最小值
典型值
最大值
SYMBOL
min
nom
max
SYMBOL
min
nom
max
A
4.80
0.37
5.00
0.47
C
1.30
0.55
0.55
0.05
0.19
1.50
0.75
0.65
0.20
0.23
A1
A2
A3
B
C1
C2
C3
C4
D
1.27 TYP
0.41 TYP
5.80
3.80
6.20
4.00
0.20TYP
1.05TYP
B1
B2
5.0TYP
D1
0.40
0.62
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 8 -
深圳深爱半导体股份有限公司
Shenzhen SI Semiconductors Co., LTD.
产品规格书
Product Specification
High Precision Non-Isolated Buck LED Driver SIC9552A/9553A/9554A/9555A/9556A
DIP7 封装机械尺寸
DIP7 MECHANICAL DATA
单位:毫米/UNIT：mm
符号
最小值
典型值
最大值
符号
最小值
典型值
最大值
SYMBOL
min
nom
max
SYMBOL
min
nom
max
A
9.10
1.474
0.41
9.50
1.574
0.51
C2
C3
C4
D
0.50TYP
A1
A2
A3
A4
A5
B
3.20
1.47
8.00
0.244
7.45
3.40
1.57
8.80
0.264
7.87
2.44
2.64
0.51TYP
0.99TYP
D1
D2
Θ1
Θ2
Θ3
6.10
3.20
6.80
6.40
3.40
7.40
17°TYP4
10°TYP4
8°TYP
C
C1
Si semiconductors
SIC9552A/9553A/9554A/9555A/9556A_EN_Rev3.0
- 9 -
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