MAX15005AEVKIT [MAXIM]
71% Efficiency at 16V Input and Full Load;
| 型号： | MAX15005AEVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 71% Efficiency at 16V Input and Full Load |
| 文件： | 总8页 (文件大小：443K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
General Description
Features
● 6.5V to 16V DC Input Range
The MAX15005A evaluation kit (EV kit) is a fully assem-
bled and tested PCB that contains an 11W flyback DCDC
converter for vacuum-fluorescent displays (VFDs) in
automotive applications. The circuit uses a MAX15005C
high-performance, current-mode pulse-width modulation
(PWM) controller in a 16-pin TSSOP package. The EV
kit circuit is configured for output voltages of 3V, 60V,
and 110V, and provides up to 650mA, 12mA, and 55mA
of current from the respective output. Additionally, a 5V
low-dropout (LDO) voltage regulator output is provided
that can source up to 15mA. Power for the EV kit circuit is
provided from a 6.5V to 16V DC source. The MAX15005A
EV kit input circuit can sustain a 40V transient.
● Outputs
• 3V Provides Up to 650mA (VFD Filament)
• 60V Provides Up to 12mA (VFD Grid)
• 110V Provides Up to 55mA (VFD Anode)
● Output Voltage Accuracy
• 110V (Anode) = ±3% (Regulated Output)
• 60V (Grid) = ±5% (Proportional Loading)
• 3V (Filament) = ±10% (Proportional Loading)
● 71% Efficiency at 16V Input and Full Load
● 5V LDO Output Provides Up to 15mA
● Hiccup Current-Limit and Overtemperature Shutdown
● 100kHz Switching Frequency
High efficiency of up to 71% is achieved using a single-
transistor flyback DC-DC converter topology. Low cost is
achieved through the use of direct secondary-side regula-
tion that does not require optical couplers. Input undervolt-
age lockout (UVLO), output overvoltage protection (OVP),
and soft-start provide for a robust 11W power supply.
● Capacitor Adjustable Soft-Start
● High-Accuracy Undervoltage Lockout (UVLO)
● Output Overvoltage Protection (OVP)
● Capable of Synchronizing to an External Clock
● Low-Cost, Robust Flyback Design
Operation at 100kHz minimizes the size of the transform-
er and passive components.
Warning: The MAX15005A 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 appropriate
to working with high-voltage electrical equipment.
● Fully Assembled and Tested
Ordering Information
PART
TYPE
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 component
debris at high velocity. Operate this kit with care to avoid
possible personal injury.
MAX15005AEVKIT+
EV Kit
+Denotes lead-free and RoHS-compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
330µF, 50V electrolytic capacitor
(12.5mm x 13.5mm)
Panasonic EEVFK1H331Q
100pF ±2%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101G
C1
C2
1
1
2
C4
C5
C6
1
1
1
0.1µF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
1000pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H102J
1µF ±10%, 16V X7R ceramic
capacitors (0805)
4700pF ±10%, 50V X7R ceramic
capacitor (0603)
C3, C10
Murata GRM21BR71C105K
Murata GMR188R71H472K
19-0964; Rev 1; 7/20
Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
47pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H470J
8.2V, 350mW ±5% Zener diode
(SOT23)
Central Semiconductor CMPZ5237B
C7
C8
1
1
1
1
2
1
1
1
1
1
D5
1
JU1, JU2
JU3
2
2-pin headers
3-pin header
0.68µF ±10%, 16V X7R ceramic
capacitor (0805)
Murata GRM219R71C684K
1
80V, 1.4A n-channel MOSFET
(8-pin SO)
Vishay Si4896DY-T1-E3
560pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H561J
N1
1
C9
R1
R2
R3
R4
R5
1
1
1
1
1
11.5kΩ ±1% resistor (0603)
560Ω ±5% resistor (1210)
51Ω ±5% resistor (0805)
402kΩ ±1% resistor (0603)
1kΩ ±5% resistor (0603)
2200pF ±10%, 100V X7R ceramic
capacitor (0603)
Murata GRM188R72A222K
C11
100pF ±10%, 63V C0G ceramic
capacitors (1206)
TKD C3216C0G2J101K
C12, C14
C13
0.070Ω ±1% power resistor (2010)
IRC LRC-LR2010LF-01-R070-F
R6
1
10µF, 200V electrolytic capacitor
(10mm x 10.5mm)
SANYO 200CE10FS
R7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
510Ω ±5% resistor (1206)
100kΩ ±5% resistor (1206)
220Ω ±5% resistor (1206)
36kΩ ±5% resistor (1206)
1.33MΩ ±1% resistor (0603)
12.1kΩ ±1% resistor (0603)
118kΩ ±1% resistor (0603)
1.33kΩ ±1% resistor (0603)
100Ω ±5% resistor (0805)
10Ω ±5% resistor (1210)
187kΩ ±1% resistor (0603)
47.5kΩ ±1% resistor (0603)
10kΩ ±5% resistor (0805)
232kΩ ±1% resistor (0603)
R8
R9
22µF, 80V electrolytic capacitor
(8mm x 10.2mm)
Panasonic EEEFK1K220P
C15
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
330µF, 6.3V electrolytic capacitor
(8mm x 10.5mm)
SANYO 6CE330EX
C16
2.2µF ±20%, 10V X5R ceramic
capacitor (0603)
AVX 0603ZD225MAT
C17
4700pF ±10%, 100V X7R ceramic
capacitor (0805)
Murata GRM219R72A472K
C18
100V, 1A super-fast diode (SMA)
Diodes Inc. ES1B-13-F
D1
D2
D3
D4
1
1
1
1
15µH, 10W, 1:3.438:2.813:0.188 turn,
100kHz transformer (10-pin gull wing)
Coiltronics CTX03-17677-R
600V, 1A super-fast diode (SMB)
Diodes Inc. MURS160-F
T1
1
400V, 1A super-fast diode (SMA)
Diodes Inc. MURS140-13-F
MAX15005CAUE/V+
(16-pin TSSOP-EP)
U1
1
40V, 3A Schottky diode (SMA)
Diodes Inc. B340A-13-F
—
—
2
Shunts (JU1, JU2, JU3)
1
PCB: MAX15005A Evaluation Kit+
Maxim Integrated
│ 2
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
Component Suppliers
SUPPLIER
AVX Corp.
PHONE
WEBSITE
www.avxcorp.com
843-946-0238
631-435-1110
561-752-5000
805-446-4800
361-992-7900
770-436-1300
714-373-7366
619-661-6322
402-563-6866
Central Semiconductor
Cooper Electronic Tech./Coiltronics
Diodes Inc.
www.centralsemi.com
www.cooperet.com
www.diodes.com
www.irctt.com
IRC
Murata Mfg. Co., Ltd.
Panasonic Corp.
SANYO Corp.
www.murata.com
www.panasonic.com
www.sanyodevice.com
www.vishay.com
Vishay
Note: Indicate that you are using the MAX15005A when contacting these component suppliers.
The maximum current for each output should be limited
to less than 650mA, 12mA, and 55mA for each respective
output detailed in step 7.
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
Detailed Description
● One 6.5V to 16V power supply capable of providing up
to 3A
The MAX15005A EV kit is an 11W flyback DC-DC convert-
er that provides output voltages of 3V at up to 650mA, 60V
at up to 12mA, and 110V at up to 55mA. The MAX15005C
flyback power supply is designed to provide power to auto-
motive VFDs. The circuit can be powered from a 6.5V to
16V DC source, which provides 3A to the EV kit.
● Three voltmeters
Procedure (Outputs)
The MAX15005A EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
The flyback DC-DC converter achieves up to 71%
efficiency and the single-transistor topology provides
for a lower-cost design. The MAX15005A EV kit pro-
vides cycle-by-cycle primary-side current-limit protection.
Current-sense resistor R6 senses the current through the
transformer’s (T1) primary winding, switching transistor
(N1), and turns off the transistor when the trip level of 0.3V
is reached. The MAX15005A EV kit features a resistor/
capacitor/diode (RCD) snubber network (R2, C11, and
D1) to minimize leakage energy ringing and clamp the
voltage at the drain of MOSFET N1 during switching.
Caution: Do not turn on the power supply until all
connections are completed.
1) Connect
a voltmeter to the FILAMENT+ and
FILAMENT- pads.
2) Connect the second voltmeter to the V_GRID and
PGND pads.
3) Connect the third voltmeter to the V_ANODE and
PGND pads.
4) Verify that a shunt is installed across the pins of jump-
ers JU1 (ON/OFF) and JU2 (SYNC).
Secondary-side regulation through feedback resistors
R13 and R14 provide ±3% regulation for the 110V output
(V_Anode). Resistors R8, R10, and R15 preload the
respective output and assist with overall regulation at mini-
mum loading. UVLO provides controlled turn-on and shut-
down during brownouts, power-up, or power-down. The
UVLO setting can be changed by replacing resistor R18.
5) Verify that a shunt is installed across pins 2-3 of
jumper JU3 (OVP).
6) Connect the power supply’s positive terminal to the
VIN pad. Connect the power supply’s ground to the
PGND pad.
7) Turn on the power supply above 7V and verify the fol-
lowing voltmeters readings:
The MAX15005C analog soft-start allows the output volt-
age to slowly ramp up in a controlled manner within 56ms
and is set by capacitor C8. The OVP is provided by inde-
pendently sensing the 110V output (V_Anode) through
resistors R11 and R12.
●
●
●
FILAMENT = 3V
V_GRID = 60V
V_ANODE = 110V
Maxim Integrated
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
The MAX15005C controller switches at a fixed 100kHz
frequency and is set by resistor/capacitor network R1 and
C5. The switching duty cycle is varied to control energy
transfer to the outputs. The maximum duty cycle is 50% for
the EV kit’s discontinuous current-mode flyback design.
Table 2. Jumper JU2 SYNC Mode
Functions
SHUNT
MAX15005A
SYNC PIN
POSITION
OPERATING MODE
Internal clock mode
(100kHz set by R1
and C5)
Shutdown Mode (Jumper- or Remote-
Control Method)
The MAX15005C EV kit features a jumper (JU1) that can
be used to shut down the flyback DC-DC converter. An
alternate shutdown method (remote control) can be done
with a user-supplied relay contact connected to pin 2 of
jumper JU1 of the EV kit. Table 1 shows jumper options.
Installed
Connected to SGND
Connected to an
external TTL/CMOS
square-wave clock
source at the SYNC
and SGND pads
Synchronization
mode (synchronized
to an external clock
frequency)
Not installed
Table 1. Jumper JU1 Shutdown Mode
Evaluating Other Current Limits, Input UVLO,
and Output OVP Shutdown
SHUNT
POSITION
MAX15005A EV KIT
OUTPUT
ON/OFF PIN
Current Limiting
UVLO resistors R17
and R18 determine
startup voltage
Installed
MAX15005A enabled
Shutdown mode
Remote mode
The EV kit features current limiting for the transformer’s
primary current. The MAX15005C IC turns off switching
MOSFET N1 when the voltage at the MAX15005C CS
pin reaches 0.3V. Current-sense resistor R6 (0.07Ω)
limits the transformer peak primary current to 4.2A
(0.3V / 0.07Ω = 4.2A). To evaluate a lower current limit,
current-sense resistor R6 must be replaced with a differ-
ent surface-mount resistor (2010 size), as determined by
the following equation:
Pulled low to PGND
through resistor R18
Not installed
Relay contacts
Not installed connected between
JU1 pin 2
R6 = (0.300V/I
)
PRIMARY
SYNC Mode
where I
mary current.
is the transformer’s maximum peak pri-
The MAX15005C can be synchronized to an external
TTL/CMOS square-wave clock source. The 2-pin jumper
(JU2) selects the SYNC mode of operation or 100kHz
internal frequency for the MAX15005C. Table 2 shows
jumper options.
PRIMARY
Input UVLO (ON/OFF)
The MAX15005A EV kit features a brownout and input-
supply startup UVLO circuit that prevents operation below
the programmed input-supply-start voltage. Resistors
R17 and R18 set the input UVLO threshold of the EV kit.
To change the input UVLO voltage, replace resistor R17
(or R18) with another surface-mount resistor (0603 size).
Using the desired startup voltage, resistor R17 is then
found by the following equation:
The TTL/CMOS square-wave clock source (from 105kHz
to 130kHz) must provide the following signal qualities:
● Output voltage:
Logic-low = 0 to 0.8V
Logic-high = 2V to 5.5V
● Output frequency = 105kHz to 130kHz
● Minimum positive-pulse width = 50ns
VIN
STARTUP
R17 =
−1 ×R18
● Connect the external square-wave clock to the SYNC
and PGND pads. Refer to the MAX15005C data sheet
for more information on the SYNC pin.
1.230V
where VIN
is the desired startup voltage that the
STARTUP
EV kit starts at, and resistor R18 is typically in the 50kΩ
range (47.5kΩ default). Refer to the Startup Operation/
UVLO/ON/OFF section of the MAX15005C data sheet
for additional information on the ON/OFF pin of the
MAX15005C IC.
Maxim Integrated
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
Resistors R12 and R20 set the OVI threshold of the OVP
circuit for the MAX15005C IC. To evaluate other OVP
voltages, replace resistor R20 with another surface-mount
resistor (0603 size). Using the desired OVP voltage, resis-
tor R20 is then found by the following equation:
Output OVP Shutdown
The MAX15005A EV kit features an OVP circuit that pre-
vents operation above the programmed V_ANODE output
supply voltage (136V default). Jumper JU3 configures
the circuit for output OVP protection when the shunt is
placed across pins 2-3. Resistors R11 and R12 set the
OVI threshold of the OVP circuit for the MAX15005C IC.
To evaluate other OVP voltages, replace resistor R11 with
another surface-mount resistor (0603 size). Using the
desired OVP voltage, resistor R11 is then found by the
following equation:
OVP
(
)
R20 =
−1 ×R12
1.228V
where OVP is the desired voltage that the circuit shut-
down is at and resistor R12 is typically in the 10kΩ range
(12.1kΩ default). See Table 3 for configuring jumper JU3
for input OVP protection.
OVP
(
)
R11 =
−1 ×R12
1.228V
Table 3. Jumper JU3 OVP Shutdown
where OVP is the desired voltage that the circuit shut-
down is at and resistor R12 is typically in the 10kW range
(12.1kΩ default). See Table 3 for configuring jumper JU3
for output OVP protection.
SHUNT
POSITION
OVI PIN
OVP OPERATION
Input overvoltage
protection (load dump)
1-2
Sense VIN input
Input OVP Shutdown (Load Dump Protection)
Sense V_ANODE
output
Output overvoltage
protection
2-3*)
The MAX15005A EV kit OVP circuit can be reconfig-
ured to provide load dump protection for VIN when it
rises above the programmed VIN supply voltage (24.7V
default). Jumper JU3 configures the circuit for input OVP
protection when the shunt is placed across pins 1-2.
Not installed
No sensing
OVP disabled
*Default position.
Maxim Integrated
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
Figure 1. MAX15005A EV Kit Schematic
Maxim Integrated
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
MAX15005A EV Kit PCB Layouts
1.0”
1.0”
Figure 2. MAX15005A EV Kit Component Placement Guide—
Component Side
Figure 3. MAX15005A EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX15005A EV Kit PCB Layout—Solder Side
Maxim Integrated
│ 7
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Evaluates: MAX15005A, MAX15005B,
MAX15005C, MAX15005D, MAX15004A,
MAX15004B, MAX15004C, MAX15004D
MAX15005A Evaluation Kit
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
8/07
Initial Release
—
Add insert roots to each page header – Evaluates: MAX15005B, MAX15005C,
MAX15005D, MAX15004A, MAX15004B, MAX15004C, MAX15004D.
Update Component List – U1 description to MAX15005CAUE/V+.
Add in MAX15005C to following sections – General Description, Detailed Descrip-
tion, Sync Mode, Evaluating Other Current Limits, Input UVLO, and Output OVP
Shutdown, and Figure 1: MAX15005A EV Kit Schematic.
All
1-6
1
7/20
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are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2020 Maxim Integrated Products, Inc.
│ 8
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