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AL8805W5-7

供电电压（最高）：36V 频率：- 类型：DC DC稳压器 内部开关：有 拓扑结构：降压 供电电压（最低）：6V

器件类别：其他集成电路（IC）    LED驱动   

厂商名称：Diodes

厂商官网：http://www.diodes.com/

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器件参数
参数名称
属性值
供电电压（最高）
36V
输出/通道电流
1A（开关）
工作温度
-40℃ ~ 125℃（TJ）
类型
DC DC稳压器
内部开关
有
拓扑结构
降压
供电电压（最低）
6V
输出数
1
文档预览
AL8805
HIGH EFFICIENCY 36V 1A BUCK LED DRIVER
Description
The AL8805 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 8 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 6V to 36V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8805 switches at frequency up to
1MHz. This allows the use of small size external components, hence
minimizing the PCB area needed.
Maximum output current of AL8805 is set via an external resistor
connected between the V
IN
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 0.4V or lower at CTRL switches off the output
MOSFET simplifying PWM dimming.
Pin Assignments
(Top View)
SW
GND
CTRL
1
2
3
4
SET
5
V
IN
SOT25
Features
•
•
•
•
•
•
•
•
LED Driving Current up to 1A
Better than 5% Accuracy
High Efficiency up to 98%
Operating Input Voltage from 6V to 36V
High Switching Frequency up to 1MHz
PWM/DC Input for Dimming Control
Built-In Output Open-Circuit Protection
SOT25: Available in “Green” Molding Compound (No Br,Sb) with
lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
Applications
•
•
MR16 Lamps
General Illumination Lamps
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
AL8805
Document number: DS35030 Rev. 4 - 2
1 of 16
www.diodes.com
July 2012
© Diodes Incorporated
AL8805
Pin Descriptions
Pin Number
1
2
Pin Name
SW
GND
Function
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
GND Pin
Dimming and On/Off Control Input.
•
3
CTRL
•
•
•
4
5
SET
V
IN
Leave floating for normal operation.
(V
CTRL
= V
REF
= 2.5V giving nominal average output current I
OUTnom
= 0.1/R
S
)
Drive to voltage below 0.4V to turn off output current
Drive with DC voltage (0.5V < V
CTRL
< 2.5V) to adjust output current from 20% to 100% of I
OUTnom
A PWM signal (low level
≤
0.4V and high level > 2.6; transition times less than 1us) allows the output
current to be adjusted below the level set by the resistor connected to SET input pin.
Set Nominal Output Current Pin. Configure the output current of the device.
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see applications
section for more information.
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
V
IN
V
SET
V
SW
V
CTRL
I
SW-DC
I
SW-PK
T
J
T
LEAD
T
ST
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Continuous V
IN
Pin Voltage Relative to GND
SET Pin Voltage Relative to V
IN
Pin
SW Voltage Relative to GND
CTRL Pin Input Voltage
DC or RMS Switch current
Peak Switch Current (<10%)
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
Ratings
2.5
200
-0.3 to 40
-5 to +0.3
-0.3 to 40
-0.3 to 6
1.25
2.5
150
300
-65 to +150
Unit
kV
V
V
V
V
V
A
A
°C
°C
°C
Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
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
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
IN
V
CTRLH
V
CTRLDC
V
CTRLL
I
SW
T
J
Parameter
Operating Input Voltage relative to GND
Voltage High for PWM Dimming Relative to GND
Voltage Range for 20% to 100% DC Dimming Relative to GND
Voltage Low for PWM Dimming Relative to GND
Continuous Switch Current
Junction Temperature Range
Min
6.0
2.6
0.5
0
—
-40
Max
36
5.5
2.5
0.4
1
125
Unit
V
V
V
V
A
°C
AL8805
Document number: DS35030 Rev. 4 - 2
2 of 16
www.diodes.com
July 2012
© Diodes Incorporated
AL8805
Electrical Characteristics
(V
IN
= 12, @T
A
= +25°C, unless otherwise specified.)
Symbol
V
INSU
V
INSH
I
Q
I
S
V
TH
V
TH-H
I
SET
R
CTRL
V
REF
R
DS(on)
I
SW_Leakage
f
OSC
θ
JA
Ψ
JB
Notes:
Parameter
Internal Regulator Start Up Threshold
V
IN
rising
Conditions
Min
Typ
Max
5.9
Unit
V
mV
µA
mA
mV
mV
Internal Regulator Hysteresis Threshold V
IN
falling
Quiescent Current
Input Supply Current
Set Current Threshold Voltage
Set Threshold Hysteresis
SET Pin Input Current
CTRL Pin Input Resistance
Internal Reference Voltage
On Resistance of SW MOSFET
Switch Leakage Current
Switching Frequency
Thermal Resistance Junction-to-
Ambient (Note 5)
Thermal Resistance Junction-to-Lead
(Note 7)
SOT25 (Note 6)
SOT25
I
SW
= 1A
V
IN
= 30V
V
SET
= V
IN
-0.1
Referred to internal reference
Output not switching (Note 4)
CTRL pin floating f = 250kHz
100
300
350
1.8
5
105
95
100
±20
16
50
2.5
0.25
22
µA
kΩ
V
0.4
0.5
1
Ω
μA
MHz
250
°C/W
50
4. AL8805 does not have a low power standby mode but current consumption is reduced when output switch is inhibited: V
SENSE
= 0V. Parameter is
tested with V
CTRL
≤
2.5V
5. Refer to figure 34 for the device derating curve.
6. Test condition for SOT25: Device mounted on FR-4 PCB (25mm x 25mm 1oz 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.
7
.
As SOT25 doesn’t have an exposed tab or exposed pad the majority of heat flow is though pin 2 down to ground.
AL8805
Document number: DS35030 Rev. 4 - 2
3 of 16
www.diodes.com
July 2012
© Diodes Incorporated
AL8805
Typical Performance Characteristics
(@T
A
= +25°C, unless otherwise specified.)
400
350
300
250
I
IN
(µA)
200
150
100
50
0
18
30
36
24
V
IN
(V)
Figure 1 Supply Current (not switching) vs. Input Voltage
12
0
6
V
CRTL
= 0V
V
SET
= V
IN
T
A
= 25°C
900
800
700
FREQUENCY (kHz)
600
L = 33µH
V
IN
= 12V
1 LED
R
SET
= 150m
Ω
T
A
= 25°C
L = 68µH
500
400
300
200
100
0
0
2
3
4
5
V
CTRL
(V)
Figure 2 Switching Frequency vs. V
CTRL
V
SET
= V
IN
= 12V
T
A
= 25°C
L = 100µH
1
1
0.9
0.8
0.7
I
LED
(A)
0.6
0.5
0.4
0.3
0.2
0.1
0
0
R
SET
= 300m
Ω
V
IN
= 12V
1 LED
L = 68µH
T
A
= 25°C
R
SET
= 100m
Ω
80
60
40
I
CTRL
(µA)
R
SET
= 150m
Ω
20
0
-20
-40
-60
2
3
4
V
CTRL
(V)
Figure 3 LED Current vs. V
CTRL
1
5
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
CTRL
(V)
Figure 4 I
CTRL
vs. V
CTRL
2.52
V
CTRL
= Open
V
SET
= V
IN
= 12V
3
2.5
2.51
2
V
CTRL
(V)
V
CTRL
(V)
V
CTRL
= Open
V
SET
= V
IN
T
A
= 25°C
1.5
2.50
1
2.49
0.5
0
0
3
6
9 12 15 18 21 24 27 30 33 36
V
IN
(V)
Figure 5. V
CTRL
vs. Input Voltage
(CTRL Pin Open Circuit)
4 of 16
www.diodes.com
2.48
-40
-15
10
35
60
85
AMBIENT TEMPERATURE (°C)
Figure 6 V
CTRL
vs. Temperature
110
AL8805
Document number: DS35030 Rev. 4 - 2
July 2012
© Diodes Incorporated
AL8805
Typical Performance Characteristics
(cont.) (@T
A
= +25°C, unless otherwise specified.)
5.0
4.5
LED CURRENT ERROR (%)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0%
20%
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
40%
60%
80%
100%
PWM DUTY CYCLE
Figure 7 I
LED
vs. PWM Duty Cycle
130
125
300
240
LED CURRENT (A)
R
DS(ON)
(m
Ω
)
180
120
V
CTRL
= Open
V
SET
= V
IN
60
T
A
= 25
°
C
0
6
24
30
36
V
IN
(V)
Figure 8 SW R
DS(ON)
vs. Input Voltage
R
SET
= 150m
Ω
L = 68µH
V
IN
= 12V
1 LED Load
V
SENSE
12
18
400
18
16
14
12
350
120
115
R
DS(ON)
(m
Ω
)
V
SENSE
(mV)
300
250
V
SW
110
105
100
95
90
10
8
6
4
2
0
-2
V
SW
200
150
85
100
-40
80
-15
10
35
60
85
110
AMBIENT TEMPERATURE (°C)
Figure 9 SW R
DS(ON)
vs. Temperature
TIME (µs)
Figure 10 SW Output Switching Characteristics
1
0.9
0.8
LED CURRENT (A)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
R
SET
= 150m
Ω
, L =68µH, V
IN
= 12V, 1LED Load, T
A
=25
°
C
Duty Cycle = 5%
I
LED
20
SWITCH and CTRL VOLTAGE (V)
18
16
V
SW
L = 33µH
R
S
= 150m
Ω
T
A
= 25°C
2 LED
12
10
8
6
4
V
CTRL
2
50
100
150
Time (µs)
Figure 11 PWM Dimming
0
200
DUTY CYCLE
6
14
9
12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 12 Duty Cycle vs. Input Voltage
AL8805
Document number: DS35030 Rev. 4 - 2
5 of 16
www.diodes.com
July 2012
© Diodes Incorporated
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