MAX5015EVKIT+ [MAXIM]
fully assembled and tested printed circuit board;
| 型号： | MAX5015EVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | fully assembled and tested printed circuit board |
| 文件： | 总7页 (文件大小：196K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2053; Rev 3; 2/07
MAX5015 Evaluation Kit
General Description
Features
♦ +36V to +72V or -36V to -72V Input Range
♦ +5V Output at 10A
The MAX5015 evaluation kit (EV kit) is a fully assembled
and tested printed circuit board (PCB) that contains a
50W forward converter in the industry-standard half-
brick footprint. The circuit is configured for a +5.0V out-
put voltage and provides up to 10A of current. Power
for the circuit can be provided from either a +36V to
+72V or -36V to -72V DC source.
♦ V
Regulation better than 0.1% over Line and
OUT
Load
♦ 86% Efficiency at 48V Input and 5V/5A Output
♦ Half-Brick Module Footprint and Pinout
♦ Short-Circuit Protection
♦ 275kHz Switching Frequency
♦ Designed for 1500V Isolation
♦ Soft-Start
High efficiency of 86% is achieved at 5A using a single
transistor, forward converter topology providing output
power up to 50W. The surface-mount transformer pro-
vides galvanic isolation and has a reset winding to
recover magnetic energy. Galvanic isolation up to
1500V is achieved by an optocoupler and surface-
mount transformer.
♦ Fully Assembled and Tested
♦ Remote ON/OFF
Operation at 280kHz allows the use of small magnetics
and output capacitors.
Warning: The MAX5015 EV kit is designed to operate
with high voltages. 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 appropri-
ate to working with high-voltage electrical equipment.
♦ Remote Sense
Ordering Information
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
IC PACKAGE
8 SO
MAX5015EVKIT
MAX5015EVKIT+
8 SO
Under severe fault or failure conditions, this EV kit may
dissipate large amounts of power, which could result in
the mechanical ejection of a component or of compo-
nent debris at high velocity. Operate this kit with care to
avoid possible personal injury.
+Denotes a lead-free package and RoHS-compliant EV kit.
Component List
DESIGNATION QTY
DESCRIPTION
Component Suppliers
0.1µF 10%, 50V X7R ceramic
capacitors (0805)
Taiyo Yuden UMK212BJ104KG
C1, C15
2
SUPPLIER
Central
PHONE
WEBSITE
631-435-1110 www.centralsemi.com
0.01µF 10%, 50V X7R ceramic
capacitor (0805)
Semiconductor
C2
C3
1
0
Coiltronics
561-752-5000 www.cooperet.com
402-564-3131 www.vishay.com
Not installed (0805)
Dale/Vishay
0.68µF, 100V X7R ceramic
capacitors (1812)
TDK C4532X7R2A684K
General
Semiconductor/
Vishay
C4, C5, C6
C7, C13, C14
C8
3
3
1
1
760-804-9258 www.vishay.com
560µF, 6.3V electrolytic
capacitors (8 x 11.5)
Sanyo 6MV560WX
International
Rectifier
310-322-3331 www.irf.com
Murata Mfg. Co.,
Ltd.
770-436-1300 www.murata.com
619-661-6835 www.sanyodevice.com
0.047µF 10%, 50V X7R ceramic
capacitor (0805)
Taiyo Yuden UMK212BJ473KG
Sanyo North
America Corp.
10µF 20%, 16V X5R ceramic
capacitor (1210)
Taiyo Yuden EMK325BJ106MN
Taiyo Yuden
TDK Corp.
800-348-2496 www.t-yuden.com
C9
847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX5015 when contacting
these component suppliers.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX5015 Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
R5
1
240kΩ 5% resistor (0805)
0.1µF 10%, 16V X7R ceramic
capacitor (0603)
Taiyo Yuden EMK107BJ104KA
C10
1
0.1Ω 1% power resistor (1206)
Dale Electronics, Inc.
R6
1
WSL1206 R1000FEA
0.33µF 10%, 35V X7R ceramic
capacitor (0805)
Taiyo Yuden GMK212BJ334KG
R7
R8
1
1
1
1
1
1
1
2
1Ω 5% resistor (0805)
C11
C12
C16
1
1
1
499Ω 1% resistor (0805)
150Ω 5% resistor (0805)
25.5kΩ 1% resistor (0805)
8.25kΩ 1% resistor (0805)
4.75kΩ 1% resistor (0805)
3.32kΩ 1% resistor (0805)
51Ω 5% resistors (0805)
R9
0.001µF, 200V X7R ceramic
capacitor (0603)
Murata GRM39-X7R102K200
R11
R12
R13
0.0047µF, 250VAC X7R ceramic
capacitor (2220)
Murata GA355DR7GC472KY02L
R15
R16, R17
170µH 1:0.857: 0.357:0.357 turn
transformer (12-pin Gull Wing)
Coiltronics CTX03-14856
0.022µF 10%, 25V X7R
ceramic capacitor (0603)
C17
D1
1
0
0
1
T1
U1
U2
1
1
1
Not installed 15V, 150mW zener
diode (S-mini)
MAX5015ESA+ (8-pin SO)
70V 100% to 200% CTR
phototransistor (8-pin SO)
Fairchild M0C207M
Not installed 3V, 150mW zener
diode (S-mini)
D2
80V, 100mA Schottky diode
(S-mini)
D3
1.24V precision shunt regulator
(SOT23)
Texas Instruments
TLV431AIDBV
40V, 20A Schottky diode
(TO-220AB)
General Semiconductor
SBL2040CT
U3
—
1
1
D4
D5
1
1
Aluminum heatsink plate
Vista Industrial Products 5015
250V, 250mA high-voltage
switching diode (SOD-123)
Central Semiconductor
CMHD2003
—
—
—
—
2
2
2
2
Nylon spacers, 1/4 x 5/8 nylon
Nylon screws, 4-40 x 1/4
Nylon screws, 4-40 x 1/2
Nylon screws, 6-32 x 3/8
4.7µH, 21.5A inductor
Coiltronics, HC2-4R7-R
L1
N1
Q1
1
1
0
TO-220AB Mica thermal
insulating pads
—
—
2
1
200V, 18A n-channel MOSFET
(TO-220AB)
International Rectifier IRF640NP6F
PCB: MAX5015 Evaluation Kit
Not installed npn transistor
(SOT23)
R1, R10
R3
0
1
Not installed (0805)
20Ω 5% resistor (1206)
2
_______________________________________________________________________________________
MAX5015 Evaluation Kit
Shutdown
Quick Start
Shutdown Mode (Remote Control Method)
The MAX5015 EV kit features a pin to remotely shut-
down the forward converter. An open-collector/drain
transistor or relay contact must be connected to the
SHDN and VIN- pins of the EV kit. Table 1 lists the
options.
The MAX5015 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed.
Output
1) Connect a jumper wire from the VOUT pin to the
+SENSE pin.
Table 1. Shutdown Pin Function
(Remote Control)
2) Connect a jumper wire from the SGND pin to the
-SENSE pin.
SHDN PIN
MAX5015 OUTPUT
MAX5015 enabled,
= +5.0V
3) Connect a voltmeter to the VOUT pin and SGND.
Open
4) Connect a +36V to +72V power supply to the VIN+
V
OUT
pin. Do not exceed 100V input voltage.
Shutdown mode,
= 0V
Pull low
Connect the power supply’s ground to the VIN- pin.
V
OUT
5) Turn on the power supply above +36V and verify
that VOUT provides +5V at the voltmeter.
For instructions on selecting the feedback resistors for
other output voltages, refer to the Evaluating other
Output Voltages section in this document.
Evaluating Other Output
Voltages, Current Limits, and
Soft-Starts
Detailed Description
V
Output Voltage
OUT
The MAX5015 EV kit is a 50W forward converter which
provides +5.0V and up to 10A at the output. The circuit
can be powered from a +36V to +72V or a -36V to -72V
DC source. The user must supply at least 220µF of
bulk storage capacitor at the input terminals (VIN+,
VIN-). The capacitor should be rated for 100V and be
able to carry 1.5A of ripple current.
The MAX5015 EV kit’s output (V
) is set to +5.0V by
OUT
feedback resistors (R11, R12). To generate output volt-
ages other than +5.0V (+3.2V to +5.0V), select different
voltage-divider resistors (R11, R12). Resistor R11 is
typically chosen to be less than 25kΩ. Using the
desired output voltage, resistor R12 is then found by
the following equation:
The 50W forward converter achieves high efficiency by
using a single transistor topology. Current limiting pro-
tects the converter against short circuits at the output.
A current sense resistor (R6) senses the current
through the primary of the transformer (T1) and the
switching transistor (N1) and turns off the transistor
when the trip level of 500mV is reached. The surface-
mount transformer features a reset winding that, along
with diode (D5), recovers the magnetic energy stored in
the core and feeds it back to the input (VIN+). The
transformer provides galvanic isolation up to 1500V.
R12 = [R11 / ((V
/ V
) - 1)] where V
= 1.24V
REF
OUT
REF
The maximum output current should be limited to less
than 10A. The usable output voltage range for the EV kit
is +3.2V to +5.0V. Additionally, ICs U2, U3, and resistor
R9 limit the minimum output voltage (V
) to +3.2V.
OUT
Current Limiting
The EV kit features current limiting for the transformer
primary current. The MAX5015 IC turns off the switch-
ing MOSFET (N1) when the voltage at the CS pin of the
device reaches 465mV. A current sense resistor (R6,
0.1Ω) limits the peak primary current to 4.65A (465mV /
0.1Ω = 4.65A). This will limit short-circuit current on the
Shunt regulator (U3) along with feedback resistors (R11,
R12) provide voltage feedback to the primary side
through optocoupler (U2). Remote output voltage sens-
ing is provided by the +SENSE and -SENSE for accu-
rate output voltage regulation across the load. The soft-
start allows the output voltage to slowly ramp up in a
controlled manner within 20ms. The MAX5015 controller
switches at a fixed 275kHz frequency, and the duty
cycle is varied to control energy transfer to the output.
secondary output (V
lower current limits, the current sense resistor (R6) must
) to 13A typically. To evaluate
OUT
_______________________________________________________________________________________
3
MAX5015 Evaluation Kit
be replaced with a surface-mount resistor (1206 size)
as determined by the following equation:
R6 = V
/ ((N / N ) x (1.2 x I
OUTMAX
))
SENSE
S
P
where V
= 0.5V, N = 5, N = 14, and I
=
SENSE
S
P
OUTMAX
maximum DC output current (10A as configured).
Soft-Start
The MAX5015 EV kit limits the ramp time to full current
limit and duty cycle with a soft-start feature. Capacitor
C2 (0.01µF), sets the ramp time to 20ms. To evaluate
other soft-start ramp times replace capacitor C2 with
another surface mount capacitor (0805 size) as deter-
mined by the following equation:
1V/div
0V
4ms/div
C2 (µF) = soft-start time (s) / (0.45s/µF)
Figure 2. Output Voltage Transient at Power-Up. VIN+ = 48V,
= 5A
Forward Converter
Waveforms
I
OUT
EFFICIENCY (%) vs. OUTPUT CURRENT (A)
90
80
70
60
50
40
30
20
10
0
20V/div
0V
0
2
4
6
8
10
12
14
1μs/div
OUTPUT CURRENT (A)
Figure 1. Efficiency vs. Output Current. VIN+ = 48V
Figure 3. MOSFET N1, Drain-Source Voltage Waveform, VIN+
= 48V
4
_______________________________________________________________________________________
MAX5015 Evaluation Kit
VIN
D1
OPEN
R1
OPEN
T1
D5
3
1
12T
4
Q1
2
L1
4.7μH
3
1
11, 12
5T
VDD
2
3
D3
VOUT
C15
0.1μF
5
SHORT
R3
20Ω
C7
560μF
6.3V
C13
560μF
6.3V
C14
560μF
6.3V
C8
0.047μF
COLLECTION TO EMITTER
VIN
5T
6
C12
0.001μF
200V
D4
1
SGND
VIN+
VIN-
8, 9
C16
C4
C5
C6
0.68μF
14T
2
0.0047μF
250VAC
0.68μF
0.68μF
2
3
R7
1Ω
N1
R8
499Ω
1%
1
8
1
7
V+
NDRV
GND
6
V
CC
C1
0.1μF
CS
C9
10μF
4
SS/SHDN
SHDN
R6
0.1Ω
1%
C3
OPEN
C2
0.01μF
2
3
V
VDD
DD
U1
C11
0.33μF
VOUT
VCC
R16
51Ω
MAX5015
5
OPTO
CS
CS
R9
150Ω
R13
4.75kΩ
1%
+SENSE
6
U2
1
2
C10
0.1μF
R15
3.32kΩ
1%
D2
5
R10
SHORT
R11
7
OPEN
25.5kΩ
1%
3
R17
R5
240kΩ
51Ω
C17
0.022μF
U3
4
5
R12
8.25kΩ
1%
-SENSE
Figure 4. MAX5015 EV Kit Schematic
_______________________________________________________________________________________
5
MAX5015 Evaluation Kit
1.0"
1.0"
Figure 6. MAX5015 EV Kit PCB Layout—Component Side
Figure 5. MAX5015 EV Kit Component Placement Guide—
Component Side
1.0"
1.0"
Figure 7. MAX5015 EV Kit PCB Layout—Inner Layer, Ground
Plane
Figure 8. MAX5015 EV Kit PCB Layout—Inner Layer, Power
Plane
6
_______________________________________________________________________________________
MAX5015 Evaluation Kit
1.0"
1.0"
Figure 10. MAX5015 EV Kit Component Placement Guide—
Solder Side
Figure 9. MAX5015 EV Kit PCB Layout—Solder Side
Revision History
Pages changed at Rev 3: 1, 2, 6, 7
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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