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AL8807W5-7

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
AL8807
HIGH EFFICIENCY LOW 36V 1A BUCK LED DRIVER
Description
The AL8807 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 9 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 AL8807 switches at frequency up to
1MHz with controlled rise and fall times to reduce EMI. This allows
the use of small size external components, hence minimizing the PCB
area needed.
Maximum output current of AL8807 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
SOT25
(Top View)
SET
GND
GND
V
IN
N/C
SW
SW
MSOP-8EP
V
IN
SET
Features
LED Driving Current up to 1.3A (MSOP-8EP)
Better Than 5% Accuracy
High Efficiency up to 96%
Optimally Controlled Switching Speeds
Operating Input Voltage from 6V to 36V
PWM/DC Input for Dimming Control
Built-In Output Open-Circuit Protection
SOT25, MSOP-8EP: Available in “Green” Molding Compound
(No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
CTRL
Applications
MR16 Lamps
General Illumination Lamps
12V Powered LED Lamps
24V Powered LED Lamps
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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
 
D1
DFLS 2100
R1
ANODE
0 R15
D3
DFLS 2100
P1
P2
D4
DFLS 2100
DFLS 2100
C5
100nF
D5
DFLS 2100
D2
SET
V
IN
C2
150µF
C3
150µF
C1
CTRL
100 nF
GND
U1
L1
33µH
C4
1µF
CATHODE
SW
AL8807
GND
AL8807
Document number: DS35281 Rev. 5 - 2
1 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807
Pin Descriptions
Pin Name
SW
GND
Pin Number
Function
SOT25
MSOP-8EP
1
5, 6
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
2
2, 3
GND Pin
Dimming and On/Off Control Input.
Leave floating for normal operation.
(V
CTRL
= V
REF
= 2.5V giving nominal average output current I
OUTnom
= 0.1/R
S
)
3
4
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.
4
1
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
5
8
section for more information.
—
—
EP
7
Exposed pad/TAB connect to GND and thermal mass for enhanced thermal impedance. Should not be
used as electrical ground conduction path.
No Connection
CTRL
SET
V
IN
EP
N/C
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
V
IN
V
SW
V
CTRL
I
SW-RMS
I
SW-PK
T
J
T
LEAD
T
ST
Caution:
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Continuous V
IN
Pin Voltage Relative to GND
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
SOT25
MSOP-8EP
Ratings
2.5
200
-0.3 to +40
-0.3 to +40
-0.3 to +6
1.25
1.6
2.5
150
300
-65 to +150
Unit
kV
V
V
V
V
A
A
°C
°C
°C
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
f
SW
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
Maximum Switching Frequency
Continuous Switch Current
Junction Temperature Range
SOT25
MSOP-8EP
-40
Min
6.0
2.6
0.5
0
Max
36
5.5
2.5
0.4
1
1
1.3
+125
Unit
V
V
V
V
MHz
A
°C
AL8807
Document number: DS35281 Rev. 5 - 2
2 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807
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)
t
R
t
F
Parameter
Internal Regulator Start-Up Threshold
Internal Regulator Hysteresis Threshold
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
SW Rise Time
SW Fall Time
I
SW
= 1A
V
SENSE
= 100±20mV, f
SW
= 250kHz
V
SW
= 0.1V to 12V to 0.1V, C
L
= 15pF
V
IN
=30V
SOT25 (Note 6)
MSOP-8EP (Note 7)
SOT25 (Note 6)
MSOP-8EP (Note 7)
250
69
50
4.3
V
SET
= V
IN
-0.1
Referred to internal reference
V
IN
rising
V
IN
falling
Output not switching (Note 4)
CTRL pin floating f = 250kHz
95
1.8
100
±20
16
50
2.5
0.25
12
20
0.5
0.4
22
100
Conditions
Min
Typ
Max
5.9
300
350
5
105
Unit
V
mV
µA
mA
mV
mV
µA
kΩ
V
Ω
ns
ns
μA
C/W
I
SW_Leakage
Switch Leakage Current
JA
JL
JC
Notes:
Thermal Resistance Junction-to-Ambient (Note 5)
Thermal Resistance Junction-to-Lead (Note 8)
Thermal Resistance Junction-to-case (Note 9)
4. AL8807 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 35 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. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and
thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed
8. Dominant conduction path via Gnd pin (pin 2).
9. Dominant conduction path via exposed pad.
AL8807
Document number: DS35281 Rev. 5 - 2
3 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807
Typical Performance Characteristics
400
350
900
800
700
FREQUENCY (kHz)
600
L = 68µH
L = 33µH
V
IN
= 12V
1 LED
R
SET
= 150m
T
A
= 25°C
300
250
I
IN
(µA)
200
150
100
50
0
0
3
6
V
CTRL
= 0V
V
SET
= V
IN
T
A
= 25°C
500
400
300
200
100
0
0
3
4
5
V
CTRL
Figure 2. Switching Frequency vs. V
CTRL
1
2
L = 100µH
9 12 15 18 21 24 27 30 33 36
V
IN
(V)
Figure 1. Supply Current (not switching) vs.
Input Voltage
100
90
LED CURRENT (A)
70
60
40
30
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
CTRL PIN VOLTAGE (V)
Figure 3. LED Current vs. V
CTRL
I
CTRL
(µA)
80
60
40
20
0
-20
-40
-60
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.0
V
CTRL
(V)
Figure 4. I
CTRL
vs. V
CTRL
2.52
V
CTRL
= Open
V
SET
= V
IN
= 12V
V
SET
= V
IN
= 12V
T
A
= 25°C
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)
2.48
-40
-15
10
35
60
85
110
AMBIENT TEMPERATURE (°C)
Figure 6. V
CTRL
VS. TEMPERATURE
AL8807
Document number: DS35281 Rev. 5 - 2
4 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807
Typical Performance Characteristics
(cont.)
9
8
LED CURRENT ERROR (%)
7
6
5
4
3
2
1
0
0
40
60
80
PWM DUTY CYCLE
Figure 7. I
LED
vs. PWM Duty Cycle
20
LED Current
Error
LED Current
L = 68H, R
S
= 150m
T
A
= 25C, V
IN
= 12V
CTRL = PWM, f
PWM
= 500Hz
1 LED
0.8
0.7
LED CURRENT (A)
0.6
0.5
0.4
0.3
0.2
0.1
0
100
300
270
240
210
R
DS(ON)
(m
)
180
150
120
90
60
30
0
6
9
V
CTRL
= Open
V
SET
= V
IN
T
A
= 25°C
12 15 18 21 24 27 30 33 36
V
IN
(V)
Figure 8. SW R
DS(ON)
vs. Input Voltage
400
350
DUTY CYCLE (%)
100
90
80
3 LEDS
L = 68µH
R
S
= 100m
T
A
= 25°C
V
CTRL
= Open
R
DS(ON)
(m
)
300
70
60
50
40
30
20
10
2 LEDS
250
200
V
CTRL
= Open
V
SET
= V
IN
= 12V
150
100
-40
10
35
60
85
110
Ambient Temperature (
C)
Figure 9. SW R
DS(ON)
vs. Temperature
-15
0
6
9
12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 10. Duty Cycle vs. Input Voltage
Figure. 11 SW Output Rise Time
Figure. 12 SW Output Fall Time
AL8807
Document number: DS35281 Rev. 5 - 2
5 of 20
www.diodes.com
March 2013
© Diodes Incorporated
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