SIC9952B [SISEMIC]
Non-Isolated Buck Sections Switch Dimming LED Driver;
| 型号： | SIC9952B |
| 厂家： | 
Shenzhen SI Semiconductors Co.,LTD. |
| 描述： | Non-Isolated Buck Sections Switch Dimming LED Driver |
| 文件： | 总11页 (文件大小：798K) |
| 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
General Description
The SIC9952(B)/9953(B)/9954(B) are high-precision buck four(4) or three(3) sections switch
dimming drivers for 86Vac-265Vac universal input non-isolated buck constant current LED lighting
Application. Operation in critical continuous mode, the power MOSFET switching loss is reduced and
the inductor is fully utilized. Output current does not vary with the inductance and the LED voltage,
excellent LED load regulation achieved.
The SIC9952/9953/9954 are four(4) sections dimming, the first switch on power output current 100%,
the second switch output current then becomes 50%, and the third switch output current becomes 25%,
the fourth switch then becomes 12.5%. The SIC9952B/9953B/9954B are three(3) sections dimming
respectively 100%, 50%, 12.5%. If the power off time is more than 5 seconds, the system will be rest,
and then the stage will go the first stage.
The SIC9952(B)/9953(B)/9954(B) integrates 500V power MOSFET. It doesn’t need the auxiliary
winding for sensing and supplying the chip. With very few external components, the system cost
and size are minimized.The SIC9952(B)/9953(B)/9954(B) with multiple protection features, including
LED short/open circuit protection, CS resistor short circuit protection, Vcc under voltage protection,
chip overheating regulation.
The SIC9952(B)/9953(B)/9954(B) are available in SOP-8/DIP-7 package.
Features
· 4 or 3 sections switch dimming
· Integrated 500V power transistor
· No auxiliary winding
· LED open circuit protection
· LED short-circuit protection
· Current Sense resistor short circuit protection
· VCC Over-voltage and Under-voltage Protection
· Over Temperature Protection
· Ultra-low operating current
· Universal Input Voltage
Typical Application
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Ordering Information
Four(4) Sections Dimming products:
(Stage_1:100%/Stage_2:50%/Stage_3:25%/Stage_4:12.5%)
Part Number
Package
Package Method
Marking
Si
Tape
9952
SIC9952(SOP-8)
SOP-8
3,000pcs/Roll
XXXXXX
Si
Tape
9953
SIC9953(SOP-8)
SIC9954(SOP-8)
SIC9954(DIP-8)
SOP-8
SOP-8
DIP-8
3,000pcs/Roll
XXXXXX
Si
Tape
9954
3,000pcs/Roll
XXXXXX
Si
Tube
SIC9954
XXXXX
50pcs/Tube
Three(3) Sections Dimming products:
(Stage_1:100%/Stage_2:50%/Stage_3:12.5%)
Part Number
Package
Package Method
Marking
Si
Tape
SIC9952B(SOP-8)
SOP-8
9952B
XXXXXX
Si
3,000pcs/Roll
Tape
SIC9953B(SOP-8)
SIC9954B(SOP-8)
SIC9954B(DIP-8)
SOP-8
SOP-8
DIP-8
9953B
XXXXXX
Si
3,000pcs/Roll
Tape
9954B
XXXXXX
Si
3,000pcs/Roll
Tube
SIC9954B
XXXXX
50pcs/Tube
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Pin Assignment
SOP-8 Products
“Si”-Logo of SI Semiconductors
MMMM--Part Number (4 digits) ； V ： Version(1 digit,
optional)
XXXXXX--Date Code (6 digits)
DIP-7 Products
“Si”-Logo of SI Semiconductors
MMMM--Part Number (4 digits)；V ：Version(1 digit,
optional)
XXXXXX--Date Code (6 digits)
Pin Description
Pin
1
Pin Name
GND
Description
Ground.
2
ROVP
SEL
Over Voltage Protection Setting Pin. Connect a resistor to GND
Function Pin, Connect to GND
3
4
VDD
Power Supply Pin.
5/6
7/8
DRAIN
ISEN
DRAIN of the MOSFET.
Output Current Sense Pin. The pin is used for output current control.
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Recommended Operation Conditions
Products
Parameter
Symbol
Range
Unit
Input Voltage220V±20%
Input Voltage220V±20%
Input Voltage220V±20%
Input Voltage220V±20%
Input Voltage220V±20%
Input Voltage220V±20%
ILED
ILED
ILED
ILED
ILED
ILED
1
2
1
2
1
2
155@VOUT=80V
255@VOUT=36V
225@VOUT=80V
330@VOUT=36V
360@VOUT=80V
400@VOUT=36V
SIC9952(B)
mA
SIC9953(B)
SIC9954(B)
mA
mA
Absolute Maximum Ratings
Parameter
Symbol
Parameter Range
-0.3～500
-0.3～6
Unit
Voltage On DRAIN Pin
Voltage On ISEN Pin
VDRN
VISEN
V
V
Voltage On ROVP Pin
Maximum Operation Current
Maximum Power Dissipation
(Ta=25oC)
Vrovp
IDDMAX
-0.3～6
V
10
mA
0.45@ SOP-8
0.90@ DIP-8
145@ SOP-8
80@ DIP-8
-40～150
-55～150
2,000
W
Ptot
Thermal Resistance Junction-ambient
Rthj-a
℃/W
Operating Junction Temperature
Storage Temperature Range
ESD
TJ
℃
℃
V
TSTG
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
Tc=25oC,VDD = 15V,unless otherwise specified
Parameter
Power Supply Section
VCC Clamp Voltage
VCC Turn on Threshold
VCC Turn off Threshold
VCC Start up Current
VCC Operating Current
Current Sense Section
Threshold Voltage for
Peak Current Limit
Threshold Voltage for
Peak Current Limit When
Out Short
Symbol
Test Conditions
Range
Unit
VCC_CLAMP
VCC_ON
VCC_UVLO
IST
1mA
16.5～17.5
13.5～14.5
8.5～9.5
≦250
V
V
VCC Rising
VCC Falling
V
VCC=VCC_ON - 1V
FOP=70KHz
μA
μA
IOP
≦210
VISEN_TH
780～820
mV
mV
VISEN_SHORT
Out Short
200
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Leading Edge Blanking
TLEB
350
200
ns
ns
Time for Current Sense
Switch Off Delay Time
Internal Time Control Section
Minimum OFF Time
TDELAY
TOFF_MIN
TOFF_MAX
TON_MAX
VROVP
4.5
240
40
0.5
16
10
6
us
us
us
V
Maximum OFF Time
Maximum On Time
ROVP Pin Voltage
SIC9952(B)
MOSFET
SIC9953(B)
RDS(ON)
RDS(ON)
VGS=15V/ IDS=0.2A
Ω
SIC9954(B)
Breakdown Voltage for
internal MOSFET
BVDSS
IDSS
VGS=0V/ IDS=250uA
VGS=0V/ VDS=500V
500
1
V
Drain Leakage Current for
internal MOSFET
uA
Over Temperature Protection
Thermal Regulation
TREG
150
℃
Temperature
Functional Block Diagram
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Applications Information
Functional Description：
The SIC9952(B)/9953(B)/9954(B) are high-precision buck section switch dimming drivers for
86Vac-265Vac universal input non-isolated buck constant current LED lighting Application. Operation
in critical continuous mode, the power MOSFET switching loss is reduced and the inductor is fully
utilized. 500V power MOSFET is integrated, which can significantly simplify the design of LED
lighting system. Works in the critical conduction mode can achieve excellent line and load regulation,
high efficiency and low BOM cost.
Start Up
When system turn on, the capacitor connected to VDD pin is charged up, while the VDD up to
threshold voltage, the internal circuits start working. The SIC9952(B)/9953(B)/9954(B) integrate a 17
zener diode to clamp the VDD voltage. Due to the ultra-low operating current, the auxiliary winding is
not need to supply the IC.
Constant Current Control
The SIC9952(B)/9953(B)/9954(B) controls the output current from the information of the current
sensing resistor. The output LED mean current can be calculated as:
VISEN
ILED
=
(A)
RISEN
Where
VISEN –800mV typically;
RISEN – The sensing resistor connected between ISEN and GND.
The ISEN comparator includes a 350ns leading edge blanking time.The LED output current can be
calculated by the following:
IPK
ILED
=
2
Where, IPK is the peak current of the inductor
Inductor Selection
The SIC9952(B)/9953(B)/9954(B) works under inductor current critical conduction mode. When the
power MOFET is switched on, the current in the inductor rises up from zero, the on time of the
MOSFET can be calculated by the equation:
L× IPK
ton =
VIN −VLED
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
Where, L is the inductance value
VIN is the DC bus voltage after the rectifier bridge
VLED is the voltage on the LED
After the power MOSFET is switched off, the current in the inductor decreases. When the inductor
current reaches zero, the power MOSFET is turned on again by IC internal logic. The off time of the
MOSFET is given by:
L× IPK
toff
=
VLED
The inductance can be calculated by the equation:
VLED ×(VIN −VLED
f × IPK ×VIN
)
L =
The f is the system switching frequency, which is proportional to the input voltage. So the minimum
switching frequency is set at lowest input voltage, and the maximum switching frequency is set at
highest input voltage.
The minimum and maximum off time of SIC9952(B)/9953(B)/9954(B) is set at 4.5us and 240us,
respectively. Referring to the equation of tOFF calculation, if the inductance is too small, the tOFF may
be smaller than the minimum off time, system will operate in discontinuous conduction mode and the
output current will be smaller than the designed value. If the inductance is too large, the tOFF may be
larger than the maximum off time, the system will operate in continuous conduction mode and the
output current will be higher than the designed value. So it is important to choose a proper inductance.
Over Voltage Protection
The over voltage protection can be programmed by the ROVP pin resistor. The ROVP pin voltage is
0.5V. When the LED is open circuit, the output voltage increases gradually, and the demagnetization
time gets shorter. The demagnetization time at OVP---- Tovp can be calculated by the open circuit
protection voltage:
L×VISEN
TOVP
≈
RISEN ×VOVP
And then the Rovp resistor value can be calculated by the equation:
ROVP ≈15×TOVP ×106 (Kohm)
Where，VISEN is ISEN turn off threshold(800mV)
L is inductance value
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
RISEN is the sensing resistor connected between ISEN and GND.
VOVP is the open circuit protection voltage
Switching Dimming Operation
The SIC9952(B)/9953(B)/9954(B) gives a very convenient switching dimming function for user
without extra components and control signal input. The users can turn on and off input power to
control the light intensity, show as the Following figure:
For four(4) sections switch dimming products,SIC9552/9953/9954, when the first time power on, the
power supply capacitor is charged by start up resistors. As the VDD voltage rising, the register and the
logic output is initialized. Then the circuit goes into normally working status with current of
100%(stage_1). When the power is off, and the power off time is longer than 300ms and less than 5
seconds, the logic output will change to the second stage and the output current will be 50% of output
current(stage_2) if the power is on again. So if you want to choose the third stage or the fourth stage,
you should re-power on during the holding time (300ms to 5 Seconds). Then the cycle will go on and
on.
If the power off time is more than 5 seconds, the system will be rest, and then the stage will go the
stage_1.
For three(3) sections switch dimming products,SIC9552B/9953B/9954B, the switching dimming stage
will be cycle as stage_1,stage_2,stage_4.
Protection Function
The SIC9952(B)/9953(B)/9954(B) offers rich protection functions to improve the system reliability,
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
including LED open/short protection, ISEN resistor short protection, VDD under voltage protection,
thermal regulation. When the LED is open circuit, the system will trigger the over voltage protection
and stop switching.
When the LED short circuit is detected, the system works at low frequency (5kHz), and the CS pin
turn off threshold is reduced to 200mV. So the system power consumption is very low. At some
catastrophic fault condition, such as ISEN resistor shorted or inductor saturated, the internal fast fault
detection circuit will be triggered, the system stops switching immediately.
After the system enters into fault condition, the VDD voltage will decrease until it reaches the UVLO
threshold, then the system will re-start again. If the fault condition is removed, the system will recover
to normal operation.
Over Temperature Protection
The SIC9952(B)/9953(B)/9954(B) integrates thermal 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 150℃ internally.
PCB Layout Guidelines
The bypass capacitor on VDD pin should be as close as possible to the VDD Pin and GND pin.
The ROVP resistor should be as close as possible to the ROVP Pin.
The power ground path for current sense should be short, and the power ground path should be
separated from small signal ground path before connecting to the negative node of the bulk capacitor.
The area of main current loop should be as small as possible to reduce EMI radiation, such as the
inductor, the power MOSFET, the output diode and the bus capacitor loop.
The NC pin should be connected to GND (pin1).
To increase the copper area of DRAIN pin for better thermal dissipation. However too large copper
area may compromise EMI performance.
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 9 -
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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
SOP-8 封装机械尺寸
SOP8 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
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 10 -
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
Non-Isolated Buck Sections Switch Dimming LED Driver SIC9952(B)/9953(B)/9954(B)
DIP-7 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
9.00
1.474
0.41
9.20
1.574
0.51
C2
C3
C4
D
0.50TYP
A1
A2
A3
A4
A5
B
3.20
1.47
8.20
0.244
7.62
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
7.10
6.30
3.40
7.30
17°TYP4
10°TYP4
8°TYP
C
C1
Si semiconductors
SIC9952(B)/9953(B)/9954(B)_EN_Rev2.0
- 11 -
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