AP8802SPG-13 [DIODES]
1A LED Step-Down Converter; 1A LED降压转换器型号: | AP8802SPG-13 |
厂家: | DIODES INCORPORATED |
描述: | 1A LED Step-Down Converter |
文件: | 总13页 (文件大小:207K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AP8802
1A LED Step-Down Converter
General Description
Features
The AP8802 is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to thirteen
LEDs, depending on the forward voltage of the LEDs, in series
from a voltage source of 8V to 48V. Series connection of the
LEDs provides identical LED currents resulting in uniform
brightness and eliminating the need for ballast resistors. The
AP8802 switches at frequency up to 500kHz. This allows the
use of small size external components, hence minimizing the
PCB area needed.
•
•
•
•
•
•
•
LED driving current up to 1A
High efficiency up to 92%
Operating input voltage up to 48V
High switching frequency up to 500kHz
PWM/DC input for dimming control
Built-in output open-circuit protection
SOP-8L, SOP-8L-EP (Preview) and DFN3030-10 are
available in “Green” Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
•
Maximum output current of AP8802 is set via an external resistor
connected between the VIN and SET input pins. Dimming is
achieved by applying either a DC voltage or a PWM signal at the
CTRL input pin. An input voltage of 0.2V or lower at CTRL shuts
down the output at SW and puts the device into a low-current
standby state.
Applications
•
•
•
•
Commercial & industrial lighting
Small LCD panel backlight
Appliances interior lighting
Architecture Detail lighting
Ordering Information
AP 8802 XX G - X
Package
Green
Packing
7/ 13 : Tape & Reel
S : SOP-8L
G : Green
SP : SOP-8L-EP (Preview)
FN : DFN3030-10
7”/13” Tape and Reel
Package
Code
S
Packaging
(Note 2)
SOP-8L
SOP-8L-EP
DFN3030-10
Device
Quantity
Part Number Suffix
AP8802SG-13
AP8802SPG-13
AP8802FNG-7
2500/Tape & Reel
2500/Tape & Reel
3000/Tape & Reel
-13
-13
-7
SP
FN
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP8802 Rev. 1
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MARCH 2009
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AP8802
1A LED Step-Down Converter
Pin Assignments
(1) SOP-8L
(2) SOP-8L-EP (Preview)
( Top View )
( Top View )
SET 1
SET 1
8
7
6
5
8
7
6
5
CTRL
GND
SW
CTRL
GND
SW
2
2
3
4
GND
NC 3
VIN
GND
NC
AP8802
AP8802
4
VIN
SW
SW
(3) DFN3030-10
( Top View )
AP8802
1
SET
10
9
CTRL
GND
NC
2
GND
8
3
NC
7
4
SW
NC
5
6
SW
VIN
Pin Descriptions
Pin Name
Description
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to
reduce EMI.
SW
GND
SET
GND pin
Set Nominal Output Current Pin. Configure the output current of the device.
Dimming and On/Off Control Input. Input voltage of 0.2V or lower forces the device into low
current standby mode and shut off the output. A PWM signal allows the output current to be
adjusted above or below the level set by the resistor connected to SET input pin.
CTRL
The input impedance is about 50kΩ, and if the pin is left open VCTRL = VREF
Input Supply Pin. Must be locally bypassed.
No connection
VIN
NC
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Block Diagram
SET SW
V
IN
Sensing
Block
Voltage
Regulator
5V
PWM/DC
Control
CTRL
GND
R
VREF 1.25V
AP8802
Figure 1: AP8802 block diagram
Absolute Maximum Ratings
Symbol
VIN
Parameter
Rating
-0.3~50
-0.3~50
150
Unit
V
VIN pin voltage
VSW
SW voltage
V
TJ
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
oC
oC
oC
TLEAD
TST
300
-65 to +150
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be
exceeded under any condition.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and
transporting these devices
Recommended Operating Conditions
Symbol
Parameter
Ambient Temperature Range
Min
Max
Unit
TA
-40
105
ºC
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Electrical Characteristics (VIN =12V, TA=25oC, unless otherwise specified)
Symbol
VIN
IOUT
Parameter
Operating Input Voltage
Continuous switch current
Quiescent Current
Conditions
Min
8.0
Typ.
-
Max Unit
48
1
V
A
(Note 3)
IQ
-
-
75
-
200
1.25
5
120
μA
FOSC
VTHD
VREF
SET
Switching Frequency
0.5
216
-
MHz
mV
V
Internal Threshold Voltage
Internal Reference Voltage
SET pin input current
184
-
-
VSET=VIN-0.2
ISW=0.8A
-
μA
Rds(on) On Resistance of MOSFET
ISW Leakage Switch leakage current
0.65
-
1.1
Ω
-
8
μA
EN
EN
Voltage High
Voltage Low
ON
OFF
1.25
-
-
-
V
V
-
-
-
-
-
-
-
0.2
SOP-8L (Note 4)
SOP-8L-EP (Preview)(Note 4)
DFN3030-10 (Note 4)
SOP-8L (Note 4)
SOP-8L-EP (Preview)(Note 4)
DFN3030-10 (Note 4)
82
TBD
38
52
TBD
24
-
-
-
-
-
-
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Thermal Resistance
Junction-to-Ambient
θJA
Thermal Resistance
Junction-to-Case
θJC
Notes:
3. Refer to figure 7 for the device derating curve.
4. Test condition for SOP-8L, SOP-8L-EP (Preview) and DFN3030-10: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum
recommended pad layout on top layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for
heat-sink is needed.
Typical Application Circuit
Figure 2: Typical Application Circuit
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Application Information
LED Current Control
The LED current is controlled by the resistor RSET in Figure 2.
Connected between VIN and SET the nominal average output current in the LED(s) is defined as:
VTHD
ILED
=
RSET
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:
VCTRL VTHD
ILED
=
VREF RSET
LED current Versus RSET and VCTRL
1200
1000
800
600
400
200
0
0.39
0.2
0.2
LED current @
VCTRL = 1.25V
0.47
0.56
LED current @
VCTRL = 2.5V
0.33
0.39
0.47
0.56
0.68
0.82
LED current @
VCTRL = 0.625V
1
1.2
1.5
0.68
0.33
0.82
0.82
1
1
2
0.47
1.2
1.5
2
0.68
3
3
3
1.2
1.5
2
0
0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85
3
RSET value [Ohms]
Figure 3: LED Current setting Vs RSET and VCTRL
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Application Information (Continued)
Inductor Selection
This section highlights how to select the inductor suitable for the application requirements, in terms of
switching frequency, LED current accuracy and temperature.
Switching Frequency @ILED = 700mA
500
68
450
400
100
47
350
300
250
200
150
100
50
12V - 3 LEDs
24V - 5 LEDs
48V - 10 LEDs
68
68
150
100
100
220
150
150
47
470
220
220
470
470
0
0
50
100
150
200
250
300
350
400
450
500
Inductor Value [uH]
Figure 4: Switching Frequency Vs Inductor Value
The inductor influences the LED current accuracy that the system is able to provide. The following section
highlights how to select the inductor in relation to the device packages and the LED current, while maintaining
the chip temperature below 70˚C.
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Application Information (Continued)
AP8802 DFN3030-10 Minimum Recommended Inductor - LED Current 1A
8% Accuracy, <70°C Case Temperature
12
11
10
9
Legend
47µH
68µH
100µH
150µH
220µH
470µH
8
7
150uH
6
5
100uH
4
3
68uH
2
47uH
1
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
Supply Voltage (V)
Figure 5: DFN3030-10 recommended inductor with 1A LED current
AP8802 SOP-8L Minimum Recommended Inductor
8% Accuracy, <70°C Case Temperature
12
11
10
9
Legend
47µH
68µH
100µH
150µH
220µH
470µH
8
7
470uH
6
220uH
150uH
5
4
100uH
3
2
68uH
47uH
1
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
Supply Voltage (V)
Figure 6: SOP-8L recommended inductor with 700mA LED current
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Application Information (Continued)
Capacitor Selection
The small size of ceramic capacitors makes them ideal for AP8802 applications. X5R and X7R types are
recommended because they retain their capacitance over wider voltage and temperature ranges than other
types such as Z5U. A 2.2μF input capacitor is sufficient for most intended applications of AP8802.
A 4.7μF input capacitor is suggested for application with an input voltage equal or higher than 40V.
Diode Selection
Schottky diodes, e.g. B2100 or B1100, with their low forward voltage drop and fast reverse recovery, are the
ideal choice for AP8802 applications.
PWM Dimming
A Pulse Width Modulated (PWM) signal with a max resolution of 8bit, can be applied to the CTRL pin to
change the output current to a value above or below the nominal average value set by resistor RSET. To
achieve this resolution the PWM frequency has to be lower than 500Hz.
Thermal Considerations
The graph below in figure 7, gives details for power derating. This assumes the device to be mounted on a
25x25mm PCB with 1oz copper standing in still air.
Maximum Power Dissipation
3
2.8
2.6
2.4
2.2
DFN3030-10
2
1.8
1.6
1.4
1.2
SOP8L
1
0.8
0.6
0.4
0.2
0
0
25
50
75
100
125
150
Ambient Temperature (DegC)
Figure 7: AP8802 derating curves
Package Selection
The device comes with a wide selection of packages. The suggested package is able to provide a case
temperature below 70˚C (with an ambient temperature of 25˚C) for the combination of input voltage and load
requested.
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Application Information (Continued)
AP8802 - suggested package @
ILED=1A and 100µHInductor
12 LEDs
11 LEDs
10 LEDs
9 LEDs
8 LEDs
7 LEDs
6 LEDs
5 LEDs
4 LEDs
3 LEDs
2 LEDs
1 LED
SOP-8L-EP
DFN3030-10
SOP-8L ÷ SOP-8L-EP ÷ DFN3030-10
Vin
Figure 8: Suggested package for a 1A application
AP8802 - suggested package @
ILED=700mA and 100µHInductor
12 LEDs
11 LEDs
10 LEDs
9 LEDs
8 LEDs
7 LEDs
6 LEDs
5 LEDs
4 LEDs
3 LEDs
2 LEDs
1 LED
SOP-8L-EP
DFN3030-10
SOP-8L
SOP-8L-EP
DFN3030-10
Vin
Figure 9: Suggested package for a 700mA application
AP8802 Rev. 1
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MARCH 2009
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AP8802
1A LED Step-Down Converter
Marking Information
(1) SOP-8L
( Top View )
5
8
Logo
G : Green
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
AP8802
YYWWX X
Part Number
1
4
(2) SOP-8L-EP (Preview)
( Top View )
5
8
G : Green
Logo
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
AP8802
YYWWX X
Part No.
E
SOP-8L-EP
1
4
(3) DFN3030-10
( Top View )
XX : Identification Code
Y : Year : 0~9
X X
W : Week : A~Z : 1~26 week;
Y X
W
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Part Number
Package
Identification Code
AP8802FNG-7
DFN3030-10
A5
AP8802 Rev. 1
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MARCH 2009
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AP8802
1A LED Step-Down Converter
Package Information (All Dimensions in mm)
(1) Package Type: SOP-8L
Gauge Plane
Seating Plane
0.62/0.82
Detail "A"
7°~9°
7°~9°
0.35max.
45°
Detail "A"
0°/8°
0.3/0.5
1.27typ
4.85/4.95
8x-0.60
6x-1.27
Land Pattern Recommendation
(Unit: mm)
(2) Package Type: SOP-8L-EP (Preview)
0°/8°
Detail "A"
Exposed pad
7°~9°
45°
1
1
7°~9°
0.15/0.25
3.3Ref.
Bottom View
0.3/0.5
1.27typ
Gauge Plane
Seating Plane
4.85/4.95
0.62/0.82
1
Detail "A"
8x-0.60
Exposed pad
6x-1.27
Land Pattem Recommendation
(Unit:mm)
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Package Information (Continued)
(3) Package Type: DFN3030-10
TOP MARK
0.10
0.08
C
C
Seating Plane
Side View
C
2.9/3.1
2.3/2.5
B
A
(Pin #1 ID)
2X-
0.25 B
0.50Typ.
Bottom View
0.375Typ.
0.2/0.3
0.10
C
A B
AP8802 Rev. 1
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AP8802
1A LED Step-Down Converter
Taping Orientation
For DFN3030-10
Notes:
5. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold Diodes Incorporatedand all the companieswhose products are represented onour website, harmlessagainst all damages.
LIFE SUPPORT
Diodes Incorporated productsare not authorizedfor use as criticalcomponents in lifesupport devices or systemswithout theexpressed written approval of the
President of DiodesIncorporated.
AP8802 Rev. 1
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