MAX5086EVKIT [MAXIM]
MAX5086 Evaluation Kit;
| 型号： | MAX5086EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX5086 Evaluation Kit |
| 文件： | 总6页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0543; Rev 1; 3/08
MAX5086 Evaluation Kit
Evluates:MAX5086
General Description
Features
The MAX5086 evaluation kit (EV kit) allows the user to
evaluate the features of the MAX5086 high-voltage lin-
ear regulator including the remote output-voltage sens-
ing capability. This EV kit is a fully assembled and test-
ed surface-mount board.
o 6.5V to 45V Input Voltage Range
o Up to 250mA Output Current
o 3.3V or 5V Regulated Output
o Package Dissipates Up to 3.5W at T = +70°C
A
The MAX5086 EV kit supplies an output current of up to
250mA at a 3.3V or 5.0V output and operates up to a
45V input voltage. This EV kit also includes connections
for the active-low microprocessor reset output and
enable input.
o Remote Output-Voltage Sensing Capability
o Active-Low Microprocessor Reset with 50ms
Reset Timeout Delay
Warning: The MAX5086 EV kit operates with high volt-
ages. Dangerous voltages are present on this EV kit
and on equipment connected to it. Users who power up
this EV kit or power the sources connected to it must be
careful to follow safety procedures appropriate to work-
ing with high-voltage electrical equipment. Under
severe fault or failure conditions, this EV kit may dissi-
pate large amounts of power, which could result in the
mechanical ejection of a component or of component
debris at high velocity. Operate this EV kit with care to
avoid possible personal injury.
Ordering Information
PART
TYPE
MAX5086EVKIT
EV Kit
*EP = Exposed pad.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
47μF, 63V, +105°C electrolytic
capacitor
Panasonic EEEFK1J470P
EN, GND (2),
RESET, VIN,
VOUT
C1
1
6
Wire loops
J1
J2, J3
R1
1
2
1
1
1
1
3-pin through-hole header, 0.1in
2-pin through-hole headers, 0.1in
0.39 1ꢀ resistor (0805)
309k 1ꢀ resistor (0805)
102k 1ꢀ resistor (0805)
10k 1ꢀ resistor (0805)
0.1μF, 50V X7R ceramic capacitor
(1206)
Murata GRM319R71H104KA01D or
KEMET C1206C104M5RACTU
C2
C3
1
1
R2
R3
22μF, 10V X7R ceramic capacitor
(1812)
Murata GRM43ER71A226KE01L or
TDK C4532X7R1C226M
R4
High-voltage linear regulator
(16 TQFN-EP*)
Maxim MAX5086AATE
U1
1
1
—
PCB: MAX 5086 Evaluation Kit
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
www.kemet.com
KEMET Corp.
864-963-6300
770-436-1300
800-344-2112
847-803-6100
Murata Electronics North America, Inc.
Panasonic Corp.
www.murata-northamerica.com
www.panasonic.com
TDK Corp.
www.component.tdk.com
Note: Indicate you are using the MAX5086 when contacting component suppliers.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX5086 Evaluation Kit
and the device operates in preset voltage mode. In pre-
set voltage mode, the internal feedback resistors set
the MAX5086’s output to 3.3V.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
When jumper J3 is closed, the voltage feedback at the
SET pin puts the MAX5086 in adjustable voltage mode.
In adjustable voltage mode, the device uses the volt-
age feedback at the SET pin, and external feedback
resistors R2 and R3 set the output voltage to 5.0V. In
this mode, the output voltage can be set at any voltage
between 2.5V and 11V by adjusting R2 and R3 using
the equations below.
•
DC power supply (0 to 20V or above, 0.5A or
above)
•
Voltmeter or oscilloscope
Procedure
The MAX5086 EV kit is fully assembled and tested. Follow
the steps below to verify board operation. Caution: Do
not turn on the power supply until all connections are
completed.
V
⎛
⎜
⎞
⎠
O
R2 =
−1 x R3
⎟
⎝1.235
1) Connect a DC power supply (0 to 20V or above,
0.5A or above) to VIN and GND.
where V is the desired output voltage.
O
2) Connect a voltmeter or oscilloscope and a 1kΩ load
The total resistance must not exceed the maximum set
by the leakage current of the SET pin input in the follow-
ing equation:
from VOUT to GND.
3) Ensure jumper J1 connects pins 1-2. Close jumpers
J2 and J3.
V
10µA
O
R3 + R2 ≤
Evluates:MAX5086
4) Turn on the power supply and increase the input
voltage to 6.5V. The output will show 5.0V 2.5ꢀ
regulated output. Increase the supply to 20V and
the output will be stable at 5V.
Remote Output-Voltage Sensing
The remote output-voltage sensing feature of the
device can be evaluated by intentionally introducing a
voltage drop between the OUT pin of the device and
the actual output terminal (VOUT) at the edge of the
board. This is made possible in the MAX5086 EV kit by
resistor R1 connected between the OUT pin of the
device and the VOUT terminal, which introduces a volt-
age drop of approximately 100mV at 250mA of output
current. Open jumper J2 to enable resistor R1.
5) Turn off the power. Open shunt J3 and then turn on
the power. The output will show 3.3V 2.5ꢀ.
6) The voltage at RESET will show 3.3V or 5.0V
depending on the status of jumper J3
Caution:
•
Do not short-circuit the output when the input sup-
ply is above 14V.
Reset Output (RESET)
A supervisory circuit is fully integrated in the MAX5086
and uses the same reference voltage as the regulator.
RESET signal goes low if VOUT drops below the preset
output voltage threshold, and remains low for at least
the timeout period after VOUT rises above the reset
voltage threshold.
•
Do not change the position of jumper J3 when
power is on.
Detailed Description
The MAX5086 EV kit allows users to evaluate the fea-
tures of the MAX5086 high-voltage linear regulator
including the remote output-voltage sensing capability.
This EV kit can be configured for a regulated output
voltage of 3.3V or 5.0V by setting jumper J3 (see Table
1 for the jumper settings), and can supply up to 250mA
of output current.
Capacitor C2 in the MAX5086 EV kit controls the reset
timeout period and is designed for a reset timeout peri-
od of 50ms. Use the following equation to calculate the
value of C2 for a different reset timeout period:
6
Output Voltage Selection
The MAX5086 device operates in either a preset volt-
age mode or an adjustable mode. When jumper J3 is
open, resistor R3 grounds the SET pin of the MAX5086
t
= C2 x 0.6175 x 10 (s)
RP
where t is the desired reset timeout period in seconds.
RP
2
_______________________________________________________________________________________
MAX5086 Evaluation Kit
Evluates:MAX5086
Jumper Selection
Available Output Current Calculation
Three-pin jumper J1 controls the EN pin of the
MAX5086 and can enable or disable the device. Two-
pin jumper J2 can short or enable resistor R1. This
jumper can be opened to introduce a voltage drop
between the OUT pin of the device and the VOUT con-
nection at the edge of the board when load is applied.
Two-pin jumper J3 controls the external voltage feed-
back network and can select between 3.3V or 5.0V at
the regulator output. Table 1 lists the jumper options.
Use the following equation to approximately calculate
the maximum available output current based on the
operating conditions:
T − T
J
A
IOUT
=
MAX
22.8 x (V − V
)
IN
OUT
where T is the maximum junction temperature, T is
J
A
the ambient temperature, V is the applied input volt-
IN
age, and V
is the selected output voltage. Note that
the output current is limited by the maximum output
OUT
current of the device.
Table 1. Jumper J1, J2, and J3 Functions
SHUNT POSITION AND FUNCTION
JUMPER
1-2
U1 is enabled
2-3
J1
J2
U1 is disabled
Open: R1 is enabled to introduce a voltage drop in the output line to evaluate remote sensing
Close: External feedback for 5.0V output is enabled
Open: Internal feedback for 3.3V output is enabled
J3
J2
1
2
VOUT
VIN
3
4
6
5
7
9
8
IN
OUT
OUT
U1
R1
0.39Ω
1%
MAX5086AATE
IN
C1
47μF
63V
2
J1
1
2
3
EN
OUTSENSE
SET
J3
10
11
RESET
CT
2
1
GND
R2
309kΩ
1%
C3
22μF
10V
EN
EP
C2
R4
10kΩ
1%
GND
0.1μF
50V
R3
102kΩ
1%
GND
RESET
Figure 1. MAX5086 EV Kit Schematic
_______________________________________________________________________________________
3
MAX5086 Evaluation Kit
Evluates:MAX5086
Figure 2. MAX5086 EV Kit Component Placement Guide—Component Side
Figure 3. MAX5086 EV Kit PCB Layout—Component Side
Figure 4. MAX5086 EV Kit PCB Layout—Layer 2
4
_______________________________________________________________________________________
MAX5086 Evaluation Kit
Evluates:MAX5086
Figure 6. MAX5086 EV Kit PCB Layout Layout—Solder Side
Figure 5. MAX5086 EV Kit PCB Layout—Layer 3
_______________________________________________________________________________________
5
MAX5086 Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
3/07
Initial release
—
Changed maximum input voltage range from 65V to 45V and increased capacitor
C1 value from 10μF/80V to 47μF/63V.
1
3/08
1, 3
Evluates:MAX5086
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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