SP7618_06 [SIPEX]
Evaluation Board Manual; 评估板手册
| 型号： | SP7618_06 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Evaluation Board Manual |
| 文件： | 总6页 (文件大小：88K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Solved by
SP7618
TM
Evaluation Board Manual
•
•
Very low dropout voltage, 100mV
Accurate current regulation down to
dropout voltage
•
•
No external components
Output current adjustable with
33.33mA/steps
•
Power-saving shutdown mode of
12nA typical
•
•
•
•
Fast turn-on (<50µS)
Time Out function to protect the LED
Thermal Shutdown Protection
Space saving 2mm x 3mm 8 pin DFN
package
DESCRIPTION AND BOARD SCHEMATIC
Figure 1. SP7618 Evaluation Board Schematic Diagram
Dec 7-06
SP7618 Evaluation Board Manual
Page 1 of 6
© 2006 Sipex Corporation
The SP7618 Evaluation Board is designed to help the user evaluate the performance of the SP7618 for use as a
single photo flash Luxeon LED Driver. The evaluation board is a completely assembled and tested surface mount
board which provides easy probe access points to all SP7618 inputs and outputs so that the user can quickly
connect and measure electrical characteristics and waveforms. The Evaluation Board schematic diagram is shown
at Figure 1.
The SP7618 is a linear low side constant current driver designed to drive high power LEDs from an input voltage
rail. The driver acts as a high current source ensuring constant LED current for a range of input voltage. The
SP7618 allows implementing the lowest cost LED driver for a variety of applications. Internal circuitry maintains the
preset constant current output for a wide voltage range at the LED input.
The LED current can be adjusted up to 1033mA with an external clock applied to the CTRL pin. The built-in thermal
protection automatically stops LED current to prevent overheating. A timeout function serves as a fail safe, shutting
down the output for currents greater than 266mA after 4 seconds of continuous operation if the enable input is not
cycled. The part can be shutdown by using the EN pin or holding the CTRL pin low for more than 100µS.
The evaluation board contains SP7618 driver (U2) with one Luxeon Flash LED as a load (D1) and pulse generator.
The pulse generator (U1, U4, and U5) is used to provide a pulse sequence to the driver’s CTRL and EN pins to set
LED current and turn the driver on/off. The number of pulses that determines LED current may be set by 5-bit dip-
switch (U3) using binary code. The number of pulses depend on switch position is shown on Table 1.
.
USING THE EVALUATION BOARD
1) Selecting the LED current
LED current can be adjusted up to 1033mA with a series of pulses applied to the CTRL pin. Each pulse increases
the output current in steps of 33.33mA. The maximum number of the pulses is 31. The 32nd and following pulses
are ignored. The number of pulses depends on the switch position as shown on Table 1, which is on the next page.
Dec 7-06
SP7618 Evaluation Board Manual
Page 2 of 6
© 2006 Sipex Corporation
.
Number Position of DIP-Switches
of pulses
1
1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
2
+
+
+
+
+
+
+
3
+
+
+
4
+
5
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
2
3
4
5
6
7
8
9
+
+
+
+
+
+
+
+
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Table 1. Code Table
Note:
“+”- this switch is in ON position
If all switches are in ON position the number of pulses is 256.
2) Powering Up the SP7618 Circuit
The SP7618 Evaluation Board can be powered from a 4.5V power supply or from 3 alkaline cells.
Connect 4.5V source pin with short lead directly to the “Vin” and -4.5V/GND pin to the “GND” posts.
Install shunt S1 to short pins 2-3 (The Evaluation board is delivered by default with shunt in this position. If shunt S1
isn’t installed or short pins 1-2 the driver SP7618 is disabled).
Push the button S2. Driver (U2) will provide to the LED current in respect to dip-switch (U3) position. If the output
current is higher than 266mA (8 pulses), the driver will turn off after 4s to prevent LED damage. Every push on
button S2 turns the driver off/on and sends the CTRL pin a new pulse sequence depending on the dip-switch
position.
Disconnect Evaluation board from power supply to turn it off.
Dec 7-06
SP7618 Evaluation Board Manual
Page 3 of 6
© 2006 Sipex Corporation
1200
1000
800
600
400
200
0
0
5
10
15
20
25
30
35
Pulses #
Measured Value
Calculated Value
Graph 1. LED Current vs. number of input pulses
6
5
4
3
2
1
0
0
5
10
15
20
25
30
35
Pulses #
Graph 2. LED Current Relative Error vs. number of input pulses
1200
1000
800
600
400
200
0
0
0.5
1
1.5
Vled, V
2
2.5
3
3.5
3 pulses
7 pulses
15 pulses
31 pulses
Graph 3. Load regulation at Vin = 5.5V
1200
1000
800
600
400
200
0
0
100
200
300
400
500
600
700
Vled, V
25C
85C
Graph 4. Load regulation at 250C and 850C
Dec 7-06
SP7618 Evaluation Board Manual
Page 4 of 6
© 2006 Sipex Corporation
EVALUATION BOARD LAYOUT
Figure 2. SP7618 Evaluation Board Layout top and bottom side
Count Reference Designator
Value
Description
2
2
5
1
1
1
1
1
1
7
5
1
1
1
1
1
1
1
2
C1, C2
C3
C4, C5, C6, C7, C9
C8
D1
D2
P1
P2
P3
R1, R2, R3, R4, R5, R13, R14
R6, R8, R9, R10, R12
R7
R11
S1
S2
U1
0.1uF
0603ZC104MAT AVX
0.01uF
1000pF
4700pF
06033C103MAT2A AVX
06033C102MAT2A AVX
06033C472MAT2A AVX
LXCL-PWF1 Lumileds
BAT42WS Diodes Inc
GND
EN
Vin
100k
10k
1M
1001-0-15-01-30-02-04-0 Mill-Max
1001-0-15-01-30-02-04-0 Mill-Max
1001-0-15-01-30-02-04-0 Mill-Max
CRCW0603104J Vishay
CRCW0603102J Vishay
CRCW0603105J Vishay
CRCW060347RJ Vishay
Header 42375-22-28-4033 Molex
7914 G-002-000E Bourns
CD74HC40103M
47
U2
U3
U4, U5
SP7618 Sipex
5-bit DIP Switch
74VHC00MTC Fairchild
Table 2. SP7618EB List of Materials
Dec 7-06
SP7618 Evaluation Board Manual
Page 5 of 6
© 2006 Sipex Corporation
ORDERING INFORMATION
Temperature Range
Model
Package Type
SP7618EB................................................... -40°C to +85°C........................................ SP7618 Evaluation Board
SP7618ER-L/TR...........................................-40°C to +85°C..............................Lead Free 8-pin DFN (2 x 3 mm)
/TR = Tape and Reel
Pack quantity is 3000 for DFN.
For further assistance:
Email:
Sipexsupport@sipex.com
WWW Support page:
Live Technical Chat:
Sipex Application Notes:
http://www.sipex.com/content.aspx?p=support
http://www.geolink-group.com/sipex/
http://www.sipex.com/applicationNotes.aspx
Sipex Corporation
Headquarters and
Sales Office
Solved by
233 South Hillview Drive
Milpitas, CA95035
tel: (408) 934-7500
fax: (408) 935-7600
TM
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey
any license under its patent rights nor the rights of others.
Dec 7-06
SP7618 Evaluation Board Manual
Page 6 of 6
© 2006 Sipex Corporation
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