ETC SMD802

原厂授权代理商　深圳市诚信联科技有限公司　联系人：古小姐　电话：０７５５－８６０９１９６３／１３２４９８２７１７１０　ＱＱ：１１３９１９６８０６
Universal High
Brightness LED Driver
FEATURES
SMD802
DESCRIPTION
> 90% Efficiency
Universal rectified 85 – 265VAC input range
Constant-current LED driver
Applications from a few mA to more than 1A
Output
LED string from one to hundreds of diodes
PWM Low-Frequency Dimming via Enable pin
Input Voltage Surge ratings up to 500V
Internal thermal overload protection
The SMD802 is a PWM high-efficiency LED driver
control IC. It allows efficient operation of High
Brightness (HB) LEDs from voltage sources ranging
from 85VAC up to 265VAC. The SMD802 controls an
external MOSFET at fixed switching frequency up to
300kHz. The frequency can be programmed using a
single external resistor. The LED string is driven at
constant current rather than constant voltage, thus
providing constant light output and enhanced
reliability. The output current can be programmed
between a few milliamps and up to more than 1.0A.
SMD802 uses a rugged high voltage junction
isolated process that can withstand an input voltage
surge of up to 500V. Output current to an LED string
can be programmed to any value between zero and
its maximum value by applying an external control
voltage at the linear dimming control input of the
SMD802. The SMD802 provides a low-frequency
PWM dimming input that can accept an external
control signal with a duty ratio of 0-100% and a
frequency of up to a few kilohertz.
APPLICATIONS
AC/DC LED Driver applications
RGB Backlighting LED Driver
Back Lighting of Flat Panel Displays
General purpose constant current source
Signage and Decorative LED Lighting
Chargers
PACKAGE/ORDER INFORMATION
VIN
ROSC
CS
LD.
GND
VDD
Gate
PWM_D
Order Part Number
SMD802MST
8-Pin Plastic S.O.I.C.
(Top View)
SMD802M
VIN
ROSC
CS
LD
GND.
VDD
Gate
PWM_D
8-Pin Plastic DIP
(Top View)
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-1-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
PIN FUNCTIONS
Pin No.
Pin Name
Function
1
VIN
Input voltage
2
CS
Senses LED string current
3
GND
Device ground
4
GATE
Drives the gate of the external MOSFET
5
PWM_D
6
VDD
Internally regulated supply voltage. 7.5V nominal. Can supply up to 1 mA for
external circuitry. A sufficient storage capacitor is used to provide storage
when the rectified AC input is near the zero crossings.
7
LD
Linear Dimming by changing the current limit threshold at current sense
comparator
8
ROSC
Low Frequency PWM Dimming pin, also Enable input. Internal 100kΩ
pull-down to GND
Oscillator control. A resistor connected between this pin and ground sets the
PWM frequency.
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-2-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN to GND
-0.5V to +520V
CS
-0.3V to (Vdd + 0.3V)
LD, PWM_D to GND
-0.3V to (Vdd – 0.3V)
GATE to GND
-0.3V to (Vdd + 0.3V)
VDDMAX
13.5V
Continuous Power Dissipation (TA = 25°C) (Note 1)
8 Pin DIP (derate 9mW/°C above +25°C
900mW
8 Pin SO (derate 6.3mW/°C above +25°C
630mW
Operating Temperature Range
-40°C to +85°C
Junction Termperature
+125°C
Storage Temperature Range
-65°C to +150°C
Note 1: Exceeding these ratings could cause permanent damage to the device. All voltages are with respect to ground. Currents are
positive into, negative out of the specified terminal.
BLOCK DIAGRAM
PWM_D
PWM
Dimming
VIN
Buffer
GATE
Thermal
Shutdown
VDD
LD
1.25V
CS
R
1.25V
Q
Undervoltage
Lockout
6.7V / 6.2V
S
250mV
Shutdown
1.25V
Reference
Voltage
1.25V
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
Oscillator
-3-
ROSC
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
TYPICAL APPLICATIONS
Universal Input
15V – 500 VDC
85 – 265 VAC
rectified
VIN
ROSC
CS
LD
GND
VDD
GATE PWM_D
Sets LED Current
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-4-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
ELECTRICAL CHARACTERISTICS Unless otherwise specified, T
Parameter
Input DC supply
voltage range
Shut-Down mode
A
= 25 OC.
Test Conditions
Symbol
Min
DC input voltage
VlNDC
15.0
Typ
Max
Units
500
V
0.5
1
mA
7.5
8.0
V
Pin PWM_D to GND, VIN = 15V
llNsd
voltage
VIN = 15-500V, lDD(ext)=0, pin
Gate open
VDD
Maximal pin Vdd
voltage
When an external voltage
applied to pin Vdd
VDDmax
13.5
V
VDD current available for
1
external circuitry
VIN = 15-100V
IDD(ext)
1.0
mA
VDD under voltage
lockout threshold
Vin rising
UVLO
6.95
V
VDD under voltage
lockout hysteresis
Vin falling
∆UVLO
Pin PWM_D input low
voltage
VIN = 15-500V
VEN(lo)
Pin PWM_D input high
voltage
VIN = 15-500V
VEN(hi)
2.4
Pin PWM_D pull-down
resistance
VEN = 5V
REN
50
100
150
kΩ
Current sense pull-in
threshold voltage
@TA = -40°C to +85°C
VCS(hi)
225
250
275
mV
GATE high output
voltage
IOUT = 10mA
VGATE(hi)
VDD
-0.3
VDD
V
GATE low output
voltage
IOUT = -10mA
VGATE(lo)
0
0.3
V
supply current
Internally regulated
Oscillator frequency
ROSC = 1.00MΩ
fOSC
ROSC = 226kΩ
7.0
6.45
500
25
30
80
100
120
Linear Dimming pin
voltage range
@TA = <85°C, Vin = 20V
VLD
0
Current sense blanking
interval
VCS = 0.55VLD, VLD = VDD
TBLANK
150
Delay from CS trip to
GATE lo
Vin = 20V, VLD = 0.15, VCS = 0
to 0.22V after TBLANK
tDELAY
GATE output rise time
CGATE = 500pF
tRISE
GATE output fall time
CGATE = 500pF
-5-
V
V
20
FPWMhf = 25kHz, at GATE, CS
to GND.
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
mV
1.0
Maximum Oscillator
PWM Duty Cycle
Thermal shut down
6.7
DMAXhf
kHz
100
%
VCS(hi)
mV
280
ns
300
ns
30
50
ns
tFALL
30
50
ns
TSD
150
215
°C
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise specified
SO 8
0.189 - 0.197
(4.800 - 5.004)
0.228 - 0.244
(5.791 - 6.198)
0.016 - 0.050
(0.406 - 0.270)
D
0.014 - 0.020
(0.356 - 0.508)
0.050
(1.270)
TYP
0.150 - 0.157
(3.810 - 3.988)
0.053 - 0.059
(1.346 - 1.753)
SEATING PLAN
8.0
MAX
0.008 - 0.010
(0.203 - 0.254)
0.004 - 0.010
DIP 8
0.250 +/- 0.005
(6.350 +/- 0.127)
0.370 - 0.400
(9.474 - 10.150)
0.300 - 0.320
(7.620 - 8.128)
0.06
(1.524)
0.145 - 0.200
(3.683 - 5.080)
0.125 - 0.140
(3.175 - 3.556)
0.045 +/- 0.015
(1.143 +/- 0.183)
J
0.009 - 0.010
(0.299 - 0.381)
95 +/- 5
0.108 +/- 0.003
(0.457 +/- 0.076)
0.100 +/- 0.010
(2.540 +/- 0.254)
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-6-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
MARKING DIAGRAM
DIP 8
SO 8
YYWW
YYWW
802MS
802M
YY = Year, WW = Working Week
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-7-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.
SMD802
IMPORTANT NOTICE
Shamrock Micro Devices (SMD) reserves the right to make changes to its products or to discontinue any
integrated circuit product or service without notice, and advises its customers to obtain the latest version of
relevant information to verify, before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or
severe property or environmental damage. SMD integrated circuit products are not designed, intended,
authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical
applications. Use of SMD products in such applications is understood to be fully at the risk of the customer.
In order to minimize risks associated with the customer’s applications, the customer should provide adequate
design and operating safeguards.
芯瑞科技股份有限公司
Shamrock Micro Devices Corp.
-8-
Rev A
SMD Doc #: DD0014
Copy Right © 2007, Shamrock Micro Device Corp.