VI Chip® Remote Sense PRM Evaluation Board

USER GUIDE | UG:016
For use with PCB part numbers: 39573 and 38693
VI Chip® Remote Sense PRM
Evaluation Board
Written by: Ankur Patel
Applications Engineer
June 2014
ContentsPage
Introduction
Introduction1
The Remote Sense PRM evaluation boards described in this document are designed
to use with the PRM family of PRM regulators and demonstrate the benefits of
the Factorized Power Architecture™. These evaluation boards are not designed for
installation in end user equipment. The system demonstrates the use of a PRM
(the pre-regulator module) and a VTM (the current multiplier or the voltage
transformation module) for general laboratory evaluation only.
Considerations for
Remote Sense only PRM
3
Contents3
Features4
Board Description
5
General Components
6
Test Points
8
Sockets9
Schematic10
Assembly Drawings
12
Bill of Materials
14
VTM Evaluation Boards
17
Recommended Test
Equipment
18
Board Operating Modes
Common Features
19
20
Remote Sense
Operating Mode: PRM
21
Remote Sense
Operating Mode: PRM
& VTM
Trim and Soft Start
Adjustment
Current Limit
Adjustment
22
Slave Operating
Mode
24
IMPORTANT NOTICE:
23
Be sure to read this design guide manual thoroughly before using this product.
Pay attention to all cautions and warnings.
24
This user guide is not comprehensive and is not substitute for common sense and
good practice. For example:
Paralleling25
Conclusion25
n When testing electronic product always use approved safety glasses.
n Provide a strain relief for wires and place the system on the bench in such a way as to prevent accidental displacement from bench top.
n Remove the power and use caution when connecting and disconnecting test probes and interface lines to avoid unintentional short circuits and contact with hot surfaces.
n Never use a jumper in place of the fuse. Replace the fuse only with its equivalent type and rating.
n Never attempt to disconnect the evaluation board from a VTM® evaluation board while power is applied. This system is not designed to demonstrate the hot plug capability.
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Page 1
The Remoste Sense PRM evaluation board can be used to demonstrate a standalone buck-boost regulator or in conjunction with a VTM evaluation board to
enable evaluation of a Factorized Power Architecture™ (FPA) system. There are many
combinations possible using PRM and VTM evaluation boards, but the focus in this
user guide is using one PRM evaluation board and one VTM evaluation board, with a
brief overview of how to parallel boards.
In Remote Sense Operation the internal regulation circuitry is disabled and an external
control loop and current sensor maintain regulation. This affords flexibility in the design
of both voltage and current compensation loops to optimize performance in the end
application. The Remote Sense PRM module evaluation board can be used to configure
the PRM in local sense mode or in non-isolated remote sense mode depending
on the application.
Table 1.
Evaluation board numbers
and their ratings
Remote Sense PRM
Part Number (PS10)
Evaluation Board
Number
Description
Input
Voltage
(V)
Output
Voltage (V)
Output
Power (W)
38 V to 55 V
5 V to 55 V
600 W
38 V to 55 V
5 V to 55 V
400 W
38 V to 55 V
5 V to 55 V
200 W
Full-Chip
Remote Sense
PRM48BF480T600A00
PRD48BF480T600A00
PRM
Evaluation
Board
Full-Chip
Remote Sense
PRM48BF480T400B00
PRD48BF480T400B00
PRM
Evaluation
Board
Half-Chip
Remote Sense
PRM48BH480T200B00
PRD48BH480T200B00
PRM
Evaluation
Board
Refer to the specific PRM data sheet for detail ratings of the device. It is important to
remain within the device limits when testing.
These boards make it convenient to evaluate the performance of Vicor’s PRM products.
All evaluation boards include sockets to allow easy "plug and play" insertion and
removal of through-hole components and wires while providing kelvin voltage
measurements test points of all pins of the PRM. Evaluation boards are designed to
simplify testing of the product by providing test points and sockets for easy connection
to standard test-equipment, lugs for input/output connections, connectors to allow easy
insertion and removal of the PRM evaluation board and VTM evaluation board.
Please note that Not all evaluation board part numbers have been listed here. Full chip and half chip
PRMs of different output power level may be using common full chip and half chip evaluation boards.
Design specific components have been arranged in table 6 based on PRM output power level. It is
recommended that the user should, first, find out which PRM part number is mounted on evaluation
board. Second, please refer to appropriate data sheet for pin functions of PRM and modes of operation.
Third, follow the appropriate section of the user guide to use the PRM evaluation board in specific
modes of operation.
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Considerations for Remote Sense only PRM
This board is designed to accomodate different types of PRMs. Therefore, certain
circuitry on the board is not populated and there are additional considerations for using
Remote Sense only PRMs.
The Remote Sense PRM Evaluation Board does not operate in default switch S10 setting
which has all switches in the OFF position. Switch at position 1 must remain in the OFF
position. Putting switch at position 1 in the ON position could short the TM pin which
would cause damage. Switch at position 6 must remain in the OFF position as well.
Please see appropriate section for switch setting and mode of operation.
The silkscreen may not match the pin names for Remote Sense PRM. Following table
maps pin names of the Remote Sense PRM to silkscreen and standard PRM.
Remote Sense PRM
PRM
Silkscreen on the Board
PR
SHARE/CONTROL NODE
SH/CN
Table 2.
PC
ENABLE
EN
TM
TRIM
TRIM
NC
NC
TP20
NC
NC
TP19
NC
AL
AL
VC
VC
VC
RE
REF/REF_EN
RE
SG
SGND
SG
IF
IFB
IFB
VS
VAUX
VAUX
NC
VT
VT
Contents
All Remote Sense PRM evaluation boards arrive with the following contents.
(The user guide can be downloaded from the www.vicorpower.com)
1 x Remote Sense PRM evaluation board
1 x VI Chip push pin heat sink
2 x VI Chip push pins for heat sink installation
2 x VI Chip push pin heat sink grounding clips
1 x hardware kit
1 x through-hole aluminum-electrolytic input capacitor (CIN)
1 x through hole resistor for default compensation (R28)
1 x through hole capacitor for default compensation (C20)
2 x jumpers
n
n
n
n
n
n
n
n
n
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Features
1. Input and output lugs for source and load connections.
2. Input fuse (appropriately rated).
3. Input filtering and sockets to place through-hole input aluminum-electrolytic capacitor for source decoupling.
4. Output filtering and sockets to place through-hole output
aluminum-electrolytic capacitor.
5. Switch for enabling and disabling the PRM through the ENABLE pin.
6. Open drain MOSFET for enabling and disabling the PRM using external source.
7. Mode selection switch for Remote Sense PRM configurations.
8. Trim control selection. (Not applied)
9. Adaptive Loop control selection. (Not applied)
10. Output current sensing for output current measurement and current feedback in Remote Sense Operation.
11. Sockets and circuits to optimize the external control circuits in
Remote Sense Operation.
12. Voltage reference to trim pot for adjusting output voltage set point in
Remote Sense Operation.
13. Dual output connectors for transferring the power and signal connections to downstream VTM® evaluation board.
14. Oscilloscope probe jack for making accurate output voltage measurements.
15. Dual paralleling connectors for PC, PR and SG signal connections to other PRM evaluation board.
16. Kelvin voltage test points and sockets for all pins of PRM.
17. Test points for current sensing and AC signal injection (RS mode).
18. Provision for installing the heat sink.
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Board Description
The following section provides a detailed description of the evaluation board
components, test points and sockets.
Figure 1.
Board description
Figure 2.
Power/signal connectors
pinout, front view
-OUT
10
VC
8
-OUT +OUT +OUT
6
4
2
-S
10
9
-OUT
7
VC
5
3
1
-OUT +OUT +OUT
9
+S
J13
Power/signal connector
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vicorpower.com V T M_-IN
4
2
8
6
7
5
3
1
V _T M V _PC V _IM
J10
Signal connector
Applications Engineering: 800 927.9474
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General Components
1. Remote Sense PRM (PS10)
2. Input lugs: Sized for #10 hardware. Use these for making connection to the input source. This board does not contain reverse polarity protection. Check for proper polarity before applying the power.
3. Input fuse (F10): Appropriately rated.
4. Input filtering: Input capacitor (CIN) and filtering (inductor and ceramic capacitors) allows for stable operation with most input sources. Sockets can be used for easy installation of aluminum-electrolytic input capacitor. It is recommended to place the 22 uF, 100 V input electrolytic capacitor in the sockets at the
input of the PRM®.
5. Enable/Disable switch (S11) and FET switch: When actuator is in top position towards “ON” text on the board, the ENABLE pin will be open and PRM device will be enabled. When actuator is in bottom position towards “OFF” text on the board, the ENABLE pin will be connected to SGND and PRM device will be disabled. When switch S11 is ON, open drain FET can be selected to control the ENABLE pin using external source.
6. Header-jumper for Adaptive Loop control (P10): Provides the option to select and enable Adaptive Loop control.
Note: Not Populated for Remote Sense PRM Evaluation Boards.
7. Header-jumper for trim control (P11): Provides the option to select and enable the trim control.
Note: Not Populated for Remote Sense PRM Evaluation Boards.
8. Operating Mode selection switch (S10): For selecting one of the following operating modes:
a. Slave Operation (used in PRM paralleling)
b. Remote Sense: Local sensing (single ended)
c. Remote Sense: Non-isolated remote sensing (differential)
9. Output lugs: Sized for #10 hardware. Use these lugs to connect the output directly
to the load.
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General Components (Cont.)
10.
Signal connector (J10): Used to transfer VTM® PC, IM, TM, -IN and Output Sense signals between the PRM and VTM boards. TM pin of VTM provides feedback to VT pin of PRM to enable temperature compensation in Adaptive Loop Operation of PRM® and VTM.
11. Power/Signal connector (J13): Used to transfer power (+OUT/-OUT) and VC to downstream VTM board when used.
12.
Output oscilloscope probe Jack (J14): Used for making the accurate scope measurements of the output voltage (i.e. ripple). Remove scope grounding lead and insert probe directly into jack ensuring a good connection between the jack and the probe ground barrel. Do not attempt to install while power is applied. May not be compatible with all scope probes.
13. Output capacitor (COUT) and output filtering (inductor and ceramic capacitors): Helps to minimize the switching ripple of the output voltage. Sockets can be used for easy installation of aluminum-electrolytic output capacitor.
14.
High-side current-sense resistor and current-sense IC (R25 and U10): Current-
sense shunt monitors the output current and IC provides the feedback to the IFB pin for constant current limit protection in Remote Sense Operation. Gain is programed using resistor R26. Constant current limit is set at ~10% above the rated output current of the PRM on all boards.
15.
Voltage sense and error amplifier: Dual op-amp provides the voltage sensing and error amplifier function. It can be configured for local voltage sensing at the PRM output or a differential amplifier to allow for non-isolated remote sensing at the VTM output or load in Remote Sense Operation. Sockets are provided
for compensation components.
16.
Voltage reference and output voltage trim pot (R44) for external voltage control loop: Remote Sense Operation trim pot adjusts the output voltage by increasing and decreasing the error amplifier reference voltage (VREF). Turn clockwise
to increase the output voltage and counterclockwise to decrease the output voltage. Sockets can be used for easy installation of soft start ceramic capacitor.
17.
Dual paralleling wire to board connectors (J17 and J18): Used for transferring signal pins (PC, PR and SG) in parallel operation from one board to other board. Provides simple strip and insert option. Accepts 18-24AWG solid wires. Spring loaded contact will grab solid wire with no need for soldering. Connection requires for parallel regulator operation are grouped together.
18.
Push-pin heat sink and grounding clip mounting holes: Use these holes for installing the optional push pin heat sink and grounding clips included
with the board. Use of the heat sink with fan is highly recommended
for appropriate cooling of the PRM module.
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Test Points Description
Each test point has a socket which accepts 0.015 – 0.025 inch diameter leads for easy
installation of solid wires and through-hole components. All the test points are brought
out to the edge of the board to allow for easy measurement and/or connection to the
user’s external circuitry. All test points are labeled and routed to the edge of the board.
Each test point is accompanied with an adjacent socket for adding a test lead or to
facilitate wiring to external circuitry.
Table 3.
Test points description
Note: for RS PRM, silkscreen
may not match pin name.
See section: Considerations for
Remote Sense only PRM
Reference
Functional
Functional
Designator
Name
Description
TP30,+IN,
TP33-IN
Input voltage test points provide kelvin connection to input pins of the PRM®. Use these test points for measuring the input voltage of the PRM to avoid error due to interconnect losses.
TP31,+OUT,
TP32-OUT
Output voltage test points provide kelvin connection to output pins of the PRM. Use these test points for measuring the output voltage of the PRM to avoid error due to interconnect losses.
TP34, Signal Ground (SG) test points are the ground reference for all control circuitry
TP21, SG
and signal pins of the PRM.
TP22
TP28,
CS+,
Used to measure the output current of the PRM across shunt resistor R25.
TP29
CS-
TP35,
IM,
Used to measure the output of current sense IC with reference to SG.
TP36
SG
TP10PR
Used to measure the PR signal of the PRM with reference to SG test point.
TP11
NC
No Connect. For internal use only.
TP12
TM
Used to measure the TM signal of the PRM with reference to SG test point.
TP13
VS
Used to measure the VS signal of the PRM with reference to SG test point.
TP14
Used to measure the RE signal of the PRM with reference to SG.
RE
TP15
NC
No Connect. For internal use only.
TP16
PC
Used to measure the PC signal with reference to SG.
TP17
VC
Used to measure the VC signal with reference to SG.
TP18IF
Used to measure the IF signal of the PRM with external constant current circuit with reference to SG in Remote Sense Operation.
TP43,
VREF
TP44
Used to measure the voltage reference signal of the error amplifier with reference to SG in Remote Sense Operation.
TP19, NC
No connect. For internal use only.
TP20
TP37,
TP38
Can be used to inject the isolated signal of network analyzer for bode plot
measurement to measure the stability in Remote Sense Operation.
TP23,
TP24 Can be used to connect function generator to control the open drain
MOSFET in ENABLE control.
TP39,
TP41 Not Applied.
TP40,
TP42 Not Applied.
VG, SG
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Sockets Description
Each socket accepts 0.015 – 0.025 inch diameter leads for easy installation of solid wires
and through-hole components for use with external circuit and test equipment.
Table 4.
Sockets description
Reference
Functional
Functional
Designator
Name
Description
Input
H57,
Sockets are used for easy installation of through-hole 100 V rated
H58Capacitor
aluminum-electrolytic capacitor.
(CIN)
H32,
H33
Output
Capacitor
(COUT)
Sockets are used for easy installation of through-hole 100 V rated
aluminum-electrolytic capacitor. Ensure proper polarity with short leads while installing.
H49,
Not Applied. H53 H50,
Not Applied.
H54
H41,
H43
Compensation
Capacitor
(C20)
Used for easy installation of through-hole compensation capacitor C20
in feedback path of error amplifier. Default through-hole 4700 pf capacitor
is added in the box. Used only with Remote Sense Operation.
H42,
H44
Compensation
Resistor
(R28)
Used for easy installation of the through-hole compensation resistor R28 in feedback
path of the error amplifier. Default through-hole 20 K resistor is added in the box.
Used only with Remote Sense Operation.
Integrator
H39,
Capacitor
Used for easy installation of through-hole compensation capacitor C19.
H40
(C19)
Differential
H47,
Input Used for easy installation of through-hole resistor R33 for non-isolated
H48
Resistor
differential sensing in Remote Sense Operation.
(R33)
Differential
H51,
Input Used for easy installation of through-hole resistor R41 for non-isolated
H52
Resistor
differential sensing in Remote Sense Operation.
(R41)
H55,
H56
Soft-start
Used for easy installation of the through-hole capacitor on top of default 0.1uF
Capacitor
to soft-start the PRM output voltage in Remote Sense Operation.
(C24)
H46,
H45
Used to insert wires to hook up the network analyzer measuring probes
to measure stability in Remote Sense Operation.
H30,
CS+
Used to insert test leads to measure the voltage across R25.
H31 CS-
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vicorpower.com J15
J11
H26
TP24
TP23
H23
TP62
TP61
G
SG
Q10
SOT23_3
F10
C16
2220
C15
2220
PIN
i
ON/OFF CONTROL
R21
0603
PIN
i
TP66
TP65
D
S
2220
C17
L10
1206
R24
1 S11
2
3
H58
H57
TP58
Cin
TP55
TP53
TP51
TP49
2220
H35
TP33
H22
TP47
C25
TP30
H28
NC2
NC1
PR
NC3
TM
PC
H15
TP13
TP21
R12
0603
TM
H16
TP14
SG
R13
0603
VS
H17
TP15
R14
0603
RE
H10
TP16
R15
0603
NC4
H18
H34
PRM2_HALF_JLEAD
-IN
+IN
NC2
NC1
PR
GND
TP34
SG
SG
TP60
HS10
-OUT
+OUT
VC
NC4
IF
NC3
VS
PS10
TP22
RE
SG
TP17
R16
0603
PC
H11
TM
PC
PRM
SIGNAL PIN TEST POINTS AND FIXED RESISTORS
TP12
R11
0603
NC3
TP45
TP11
R10
0603
PR
PIN
TP56
i
TP10
H14
TP18
H36
H29
TP36
TP35
H37
-OUT
H38
IMON
TP59
TP32
2220
C26
1206
R22
SG
V OUT
V-
+IN
V+
RG
-IN
TSOT23_6
U10
2512
6
5
4
TP68
H31
TP29
0603
VCC
C18
SG
R26
1206
L11
1206
R23
VS
1210
C11
C13
TP26
C14
TP27
TP25
2
9
-OUT
-OUT
10
3
7
VC
5
+SENSE
4
2
4
6
8
10
2
4
6
8
10
7
VC_OUT
1
3
5
7
9
J13
1
3
5
7
9
J10
6
Applications Engineering: 800 927.9474
9
9
+S
-S
10
-SENSE
8
7
8
TP64
J16
J12
VTM_-IN
4
2
J14
5
3
1
V_TM V_PC V_IM
6
-OUT
TP63
VTM_-IN
10
SLAVE
REMOTE SENSE (Differential)
LOCAL SENSE (Single Ended)
CONNECTOR FRONT VIEW
5
3
1
-OUT +OUT +OUT
-OUT +OUT +OUT
6
4
2
H33
VC
8
H32
VTM_TM
VTM_PC
VTM_IM
H24
1
1210 1210 1210 Cout
C12
POUT
i
H27
NC4
IF
H25
PRM_+OUT
PR
i +S
i -S
S10
SW_21910MST
RE
MODE SELECT
VCC
i POUT
LOCAL SENSE_+
i POUT
+SENSE_B
-SENSE_B
VTM_TM
-SENSE
+SENSE
POUT
i
ON
20
19
18
17
16
15
14
13
12
11
TM
SG
EAO
IMON
REF_EN_B
CURRENT SENSE AMPLIFIER
1
2
3
TP67
R25
TP28
VC_OUT
R20
0603
NC2
POUT
H30
i
R19
0603
TP20
NC1
H20
TP57
PRM_+OUT
VC
NC4
IF
RE
VS
TP31
TP54
TP52
TP50
TP48
TP19
H19
R18
0603
IF
H21
TP46
R17
0603
VC
H12
Remoste Sense
PRM evaluation board
schematic
1
2
3
4
5
6
7
8
9
10
H13
Schematic
Schematic for half-chip and full-chip Remote Sense PRM evaluation board is same.
Figure 3a.
Page 10
SG
SGND
TRIM POT
EXT TRIM
R46
0603
PR
PC
SG
P11
2
4
6
T P72
CN 6_DIGIKEY_95278
1
3
5
CO NN3PIN
J17
CONN3PIN
J18
TRIM/TM CONTROL SELECT
R3 5
0603
R4 0
SIGNALS FOR PARALLELING
H54
R3 8
1206
T P70
T P42
T P40
T P71
3
2
1
H50
3
2
1
T P69
TM
EXT AL
SGND
AL POT
H53
R3 7
1206
T P74
T P41
T P39
H49
T P73
SG
T P75
P10
2
4
6
NC3
T P76
CN6_DIGIK EY_95278
1
3
5
AL/NC CONTROL SELECT
R3 4
0603
R3 9
Note: Components for TRIM and AL controls are not applied.
REF_ EN_ B
EAO
0603
C23
H43
1
IN
U12
SG
R4 5
1206
R4 4
1
1206
C19
R4 3
1206
SG
3
2
U11A
SO8
R28
1206
H42
H40
H56
1206
C24
H55
1206
C22
H44
VREF
T P43
T P44
R36
1206
1206
R3 2
SG
VOLTAGE SENSE AND ERROR AMPLIFIER
7
6
5
U11B
R42
1206
R31
1206
REMOTE SENSE CONTROL CIRCUITRY
VOLTAGE REFERENCE
SG
SOT 23_3
C21
0603
VCC
C20
1206
H41
H39
2
OUT
vicorpower.com G ND
UG:016
3
8
H51
R41
1206
R3 3
1206
R2 9
H47 1206
R2 7
1206
T P37
H52
H48
H46
T P38
-SENSE_B
+SENSE_ B
R3 0
1206
IMON
LOCA L SENSE_+
H45
Remoste Sense
PRM evaluation
board schematic
4
ADAPTIVE LOOP CONTROL CIRCUITRY
Schematic (Cont.)
Figure 3b.
Applications Engineering: 800 927.9474
Page 11
Assembly Drawings
H57
C17
L10
PS10
PF43
PF44
H56
PF46
R23
J13
H32
J14
C14
C13
C11
C12
PF19
H35
PF49
H33
H36
H27
H25
H24
H11
H17
H34
H12
H16
H18
H13
H21
H10
H22
H15
H19
H14
PF16
J16
PF17
TP26
TP25
PF15
TP27
PF14
TP17
PF13
PF12
TP14
PF11
TP34
PF10
TP18
PF09
TP13
PF08
TP15
PF07
TP21
TP16
PF06
TP10
PF05
TP12
PF04
TP22
PF03
TP11
TP19
PF02
PF01
TP20
J17
J18
R46
H20
TP33
FID01
TP31
H44
H43
C20
R28
H42
J10
L11
PF18
J15
PF41
PF38
H41
C19
H29
R26
PF45
R25
PF20
TP44
TP43
H55
H40
U11
R32
U10
C18
PF39
PF40
FID02
PF37
PF48
H58
C16
R29
PF36
PF35
C21
R36
J12
PF42
H26
R24
C15
R27
R15
R13
R18
R14
R17
R22
HS10
PF32
TP37
PF47
TP32
Q10
PF22
R10
R16
R12
R19
R20
R11
R30
TP38
S11
R21
PF23
TP24
F10
TP23
H23
H45
PF33
H39
P11
PF31
P10
H28
R33
PF30
H48
PF50
H51
R41
PF29
TP29 H31
H52
TP30
R31
C22
R42
C24
PF28
TP36 H38
R35
S10
PF27
PF34
TP39
R34
TP41
PF26
R43
H46 H47
PF24
R45
R44
TP28 H30
R38
PF25
U12
C23
TP35 H37
R37
H53
R40
TP40 H50
J11
H49
R39
TP42
Top view: Half-chip
evaluation board
assembly drawing
H54
Figure 4a.
C17
H57
H31
H30
TP44
H56
J13
L11
H32
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vicorpower.com PF16
H27
PF17
J16
TP27
H25
H24
PF15
TP26
PF14
TP25
H11
H17
PF13
TP17
PF12
TP14
H34
H12
PF11
TP34
PF10
TP18
H16
H18
PF09
TP13
H21
PF08
TP15
PF07
TP21
H13
H10
PF06
TP10
PF05
TP16
H15
H22
PF04
TP12
PF03
TP22
H14
H19
PF02
TP11
TP20
PF01
TP19
H20
J18
R46
J17
PF42
H36
TP33
J14
TP32
PF49
H33
C14
C13
C12
C11
PF19
H35
FID01
PF41
FID02
R28
C20
R23
PF18
J15
TP31
H44
H43
H40
C19
H42
J10
PF46
R25
PF20
PF38
R26
PF45
TP29
R22
PS10
PF44
U10
H29
PF48
H58
C16
C15
C18
PF39
PF40
R36
R32
R29
PF43
R24
L10
R27
TP28
PF22
F10
TP24
H26
R15
R13
R18
R14
R17
H37
R10
R16
R12
R19
R20
R11
PF37
C21
TP37
TP35
Q10
PF23
S11
R21
TP23
H23
R30
TP38
HS10
J12
H41
H45
PF32
P11
PF31
PF36
PF35
H39
PF30
R33
PF33
PF50
P10
C24
H55
H51
R41
PF29
U11
H52
R31
C22
R42
H48
H28
PF47
PF28
H38
S10
TP30
TP43
R43
TP36
R35
PF27
H46 H47
TP41
TP39
R34
PF26
PF34
R38
PF24
PF25
R45
R44
U12
H50
R37
H53
C23
R40
TP40
J11
H49
R39
TP42
Top view: Full-chip
evaluation board
assembly drawing
H54
Figure 4b.
Applications Engineering: 800 927.9474
Page 12
Assembly Drawings (Cont.)
Figure 4c.
Bottom view: Half-chip/Full-chip
evaluation board
assembly drawing
TP73
TP69
TP70
TP74
TP61
TP63
TP72
TP76
TP71
TP75
TP65
TP68
TP67
TP57
C25
C26
TP66
TP59
TP56
TP58
TP64
TP62
TP46
TP48
TP54
UG:016
TP50
vicorpower.com TP60
TP52
TP49
TP45
TP51
TP47
TP55
TP53
Applications Engineering: 800 927.9474
Page 13
Bill of Materials
Following table describes the most common components of full chip and half chip
Remote Sense PRM evaluation boards.
Table 5.
Common components
Reference
Manufacturer
Description
Manufacturer
Part Number
Designator
C11, C12, C13, C14
CAP X7R 2.2uF 10% TDK CORP OF AMERICA
C3225X7R2A225KT5LOU
100V 1210 .102 MAX HT
C15, C16, C17
CAP X7R 4.7uF 20% 100V 2220
TDKC5750X7R2A475M
C18, C21, C23
CAP X7R .01uF 10% 100V 0603
MURATAGRM188R72A103KA01J
C20* not applied– use sockets
CAP X7R 4700pF 10% 50V RADIAL AVX CORP
SR155C472KAR
CAP X7R .10uF 10% AVX CORP
12061C104KATMA
C24
100V 1206
CIN
CAP ALEL 22uF 20% 100V RADIAL 8 X 11.5
PANASONICEEU-FC2A220
F10
Design Specific – see Table 5
H10 to H58
PIN RECPT .015/.025 DIA
0667 SER TH
MILL-MAX MFG CORP
J10, J13
CONN 10 PINS 2.54MM
PITCH DUAL ROW SM HO
GCTBG225-10-A-N-A
J14
JACK VERTICAL MECH
THRU HOLE
TEKTRONIX131-5031-00
J17, J18
CONN 3 POS WIRE
TO BOARD SMD
AVX CORP
478-6170-2-ND
JUMPER_HEADER
JUMPER SOCKET XJ8A
OMRON ELECTRONICS
XJ8A-0211
L10, L11
IND 0.1uH 20% 32.5A 2525
VISHAY/DALEIHLP2525CZERR10M01
0667-0-57-15-30-27-10-0
P10, P11
Not Applied
PCB
Design Specific – see Table 5
PS10
Design Specific – see Table 5
Q10
FET 2N7002 SOT-23
ON SEMICONDUCTOR
2N7002LT1G
R21
RES 10K OHM 1/10W
1% 0603
KOA SPEER
RK73H1J1002FTD
R22
RES ZERO OHM JUMPER
2A 1206
KOA SPEER
RK73Z2BTTD
R23, R24
RES 1 OHM 1/4W 5% 1206
KOA SPEER
RK73B2BTTE1R0J
R25
UG:016
Design Specific – see Table 5
vicorpower.com Applications Engineering: 800 927.9474
Page 14
Bill of Materials (Cont.)
Following table describes the most common components of all four versions of PRM®
evaluation boards.
Table 5 (Cont.).
Common components
Reference
Manufacturer
Manufacturer
Description
Designator
Part Number
R26
Design Specific – see Table 5 – Remote Sense Operation – set the constant current limit
R28* – not applied – use sockets
RES 20K OHM 1/4W
1% AXIAL
KOA SPEER
MF1/4DCT52R2002F
R29
RES 54.9K OHM 1/4W
1% SMD 1206
KOA SPEER
RK73H2BTTE5492F
R30
RES 20 OHM 1/4W
1% 1206
KOA SPEER
RK73H2BTTD20R0F
R31, R42
RES 1.27K OHM 1/4W 1
% SMD 1206
KOA SPEER
RK73H2BTTE1271F
R34
Not Applied
R35
Not Applied
R36
KOA SPEER
RES 1K OHM 1/4W
1% 1206
RK73H2BTTE1001F
R39, R40
Not Applied
R43
RES 10K OHM 1/4W
1% 1206
KOA SPEER
RK73H2BTTE1002F
R44
RES TRIM POT 10K
OHM 1/2W 10% TH
COPAL ELECTRONIC
CT94EY103
R45
RES 1K
OHM 1/4W 1% KOA SPEER
RK73H2BTTE1001F
SMD 1206
R46
RES 1 OHM 1/10W
1% 0603
PANASONIC
ERJ-3RQF1R0V
S10
MECH SMD 10-POS
DIP SWITCH
CTS
ELECTROCOMPONENTS
219-10MSTRF
S11
SW TOGGLE SPDT
C & K COMPONENTS
GT11MSCBE
1 POS SMD
TP10 to TP44
TEST POINT, SURFACE MOUNT
KEYSTONE
U10
IC HV I SENSE
LMP8645HV TSOT-6
NATIONAL
SEMICONDUCTOR
LMP8645HVMKE/NOPB
U11
IC DUAL OPAMP
LM6142AIM 8PIN SO
NATIONAL
SEMICONDUCTOR
LM6142AIMNOPB
U12
IC VREF 1.25V
REF3312 SOT23 3
TI
5017
REF3312AIDBZT
Please note that R28 and C20 are through-hole default compensation components required for
Remote Sense operation.
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vicorpower.com Applications Engineering: 800 927.9474
Page 15
Bill of Materials (Cont.)
Following table describes the design specific components of all four versions of PRM®
evaluation boards.
Table 6.
Design specific components
Reference
Manufacturer
Description
Manufacturer
Designator
Part Number
Evaluation board number: PRD48BF480T400B00
PS10
REMOTE SENSE PRM FULL
VICORPRM48BF480T400B00
CHIP 400W
R26
RES 215K OHM 1/4W
1% 1206
KOA SPEER
R25
RES I SENSE 5m OHM
1W 1% 2512
VISHAYWSL25125L000FEA
F10
FUSE 20A 125VAC
FAST 10.1X3.1 SMD
LITTELFUSE0456020.ER
PCB
SNGLTD PCB FULL PRM
CONFIG CB
VICOR39573
Evaluation board number: PRD48BH480T200B00
PS10
REMOTE SENSE PRM HALF
VICORPRM48BH480T200B00
CHIP 200W
R26
RES 215K OHM 1/4W
1% 1206
KOA SPEER
R25
RES I SENSE 10m OHM
3W 1% 2512
BOURNSCRA2512-FZ-R010ELF
F10
LITTLE FUSE 10 AMP
R451010.MRL
LITTELFUSE0451010.MRL
PCB
SNGLTD PCB HALF PRM
CONFIG CB
VICOR38693
RK73H2BTTE2153F
RK73H2BTTE2153F
Evaluation board number: PRD48BF480T600A00
PS10
REMOTE SENSE PRM FULL
CHIP 600W
VICOR
R26
RES 178K OHM 1/4W
1% 1206
KOA SPEER
RES I SENSE 4m OHM
1W 1% 2512
PANASONIC
ERJM1WSF4M0U
F10
FUSE 25A 125VAC FAST
10.1X3.1 SMD
LITTELFUSE
0456025.ER
PCB
SNGLTD PCB FULL PRM
CONFIG CB
VICOR
39573
R25
UG:016
vicorpower.com PRM48BF480T600A00
RK73H2BTTE1783F
Applications Engineering: 800 927.9474
Page 16
VTM® Evaluation Boards
The Remote Sense PRM evaluation board is designed to work with all types of VTM®
evaluation boards to facilitate testing of virtually any PRM®/VTM combination. The VTM
evaluation board contains dual connectors designed to mate with J10 and J13 on PRM
evaluation board. The additional signal connector is used to transfer VTM signal pins, as
well as S+ and S- signals between boards. The S+ and S- signals are tied to the VTM output
using local sense resistors and can be used for implementing non-isolated remote sense
as described in a later section. Board also provides the ability to inject an AC signal for
measuring the loop response and break the isolation for non-isolated remote sense using
PRM and VTM.
Figure 5.
VTM evaluation board
Figure 6.
VTM evaluation board
connector pin out
(front view)
VTM -IN
NC
VS-
+IN
+IN
-IN
VC
-IN
IM-VTM
TM-VTM NC
PC-VTM
VS+
+IN
+IN
-IN
VC
-IN
VTM evaluation board
signal connector
UG:016
vicorpower.com VTM evaluation board
power/signal connector
Applications Engineering: 800 927.9474
Page 17
Figure 7.
Remote Sense
PRM evaluation board
connection to
VTM evaluation board
Recommended Test Equipment
The following is a list of recommended test equipment.
1. DC power supply: 0 - 80 V, 600 W minimum
2. Load: Rated appropriately based on output voltage, current and power requirements.
3. Digital multi-meters (DMMs)
4. Oscilloscope + probes
5. Function generator (for external enable/disable)
6. Auxiliary bench voltage supply
7. Network analyzer
8. Interconnect wires, cables and fastening hardware.
9. Calibrated input and output shunts, appropriately rated (for efficiency measurements)
10. Trim pot screwdriver
11.Fan
12. Datasheets of requisite PRM® and VTM® device used.
13. Safety glasses
14. Thin bladed tool for wire extraction from paralleling connectors
(AVX part number: 06-9276-7001-01-000)
Push Pin Heat Sink Installation
Each PRM and VTM evaluation board comes with its own heat sink and push pins for
installation. Before testing, it is highly recommended that heat sinks be installed in the
appropriate location for each board. When installing the push pin heat sink, use caution
not to exceed the maximum compressive on the device listed in the data sheet.
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vicorpower.com Applications Engineering: 800 927.9474
Page 18
Line and Load Connections
n Make sure that input power supply is OFF.
n Connect the input power supply positive lead to the +IN input lug of the
evaluation board.
n Connect the input power supply return lead to the –IN input lug of the
evaluation board.
n Connect the output lug +OUT to the positive terminal of the electronic load.
n Connect the output lug –OUT to the return terminal of the electronic load.
n Verify proper polarity of the connections.
n Place the input capacitance 22 uF, 100 V.
n Turn the FAN ON.
n Have the latest version of the datasheet.
Board Operating Modes
Remote Sense PRM evaluation board supports different Remote Sense configurations.
Therefore, operating mode selection switch S10 is provided on the board for selection of
the following operating modes:
n Remote Sense: local sensing (single ended)
n Remote Sense: non-isolated remote sense (differential)
n Slave (for array operation)
Figure 8.
Mode select switch
VCC
REF_ EN_ B
V T M_T M
i POU T
LOCA L SENSE_ +
i POU T
+SENSE_B
-SENSE_B
IMON
SG
S10
SW_ 21910MST
1
2
3
4
5
6
7
8
9
10
ON
20
19
18
17
16
15
14
13
12
11
EAO
i -S
TM
-SENSE
+SENSE
PR
PRM_ +OUT
IF
NC4
RE
VS
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vicorpower.com i +S
Applications Engineering: 800 927.9474
Page 19
Figure 9.
Switch configuration
ON
OFF
LOCAL SENSE (Single Ended) using PRM
ON
OFF
REMOTE SENSE (Differential) using PRM and VTM
ON
OFF
SLAVE using PRM
Postion
number
1
2
3
4
5
6
7
8
9
10
Figure 9 provides the illustration for how to configure the switch for each operating mode.
Common Features in all Modes of Operations
n On / off control to enable and disable the PRM® in the presence of input power.
n
Using switch S11 or
n
Open drain MOSFET using external circuitry or function generator
n Input filtering (inductor and ceramic capacitors)
n Output filtering (inductor and ceramic capacitors)
n Sockets for easy installation of input and output electrolytic capacitor
n Test points for current sensing
n Kelvin test points for measurement of input voltage, output voltage and
all signal pins of the PRM.
n Sockets for each test point for easy installation of through-hole components and solid wires to facilitate the wiring to external circuitry and test equipment.
Figure 10.
H23
1 S11
2
3
T P65
PC
D
ON / OFF control
G
Q10
SOT 23_3
R2 1
0603
S
T P23
T P24
T P66
SG
H26
ON / OFF CONTROL
UG:016
vicorpower.com Applications Engineering: 800 927.9474
Page 20
Remote Sense Operating Mode using PRM®: Local Sensing (Single Ended)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in
following illustration.
Figure 11.
ON
OFF
Local Sensing
(single ended)
Postion
number
LOCAL SENSE (Single Ended)
1
2
3
4
5
6
7
8
9
10
The following table describes the switch configuration.
Table 7.
Switch configuration
in local sensing
Switch
Position
Number
ON or OFF
Connection
1OFF
TM pin must be left open. This switch position cannot be put in the
ON position.
PR pin is connected to output of external error amplifier.
2
ON
3ON
IF pin is connected to output of external current sense amplifier to set
constant current limit.
4ON
RE pin is connected to input of the external voltage reference circuit to generate voltage reference for external error amplifier.
5
ON
VS pin is connected to power VCC of the op-amp and current sense IC.
6
OFF
NC pin must be left open. This switch position cannot be put in the ON position.
7ON
PRM +OUT pin is connected to local sense (single ended) of the remote sense control circuitry.
8
Don’t care
9
OFF
See next Remote Sense Operation
10
OFF
See next Remote Sense Operation
Figure 12.
Remote Sense: local sensing
(single ended) control circuitry
BLUE highlight =
Pre-installed component
GREEN highlight =
user installed component
H 39
Preinstalled component
and connections
H 43
H 41
H 40
1206
C19
H 42
OPEN
1206
C22
VCC
SG
OPEN
1206
R32
1
4
3
5
7
2
VREF
U11A
SO8
SG
R36
1206
1K
R29
H 47 1206
54.9K
R31
1206
1.27K
SG
C21
0603
8
To PR through S10
TP38
H 45
H 46
R28
1206
20K
C20
1206
4.7nF
6
H 51
AC signal
injection
IMON
OPEN TP37
User installed
component
EAO
R27
1206
H 44
H 48
R33 OPEN
1206
H 52
U11B
R41 OPEN
1206
R30
1206
20Ω
To PRM +OUT
through S10
LOCAL SENSE_+
+SENSE_B
-SENSE_B
R42
1206
1.27K
In this configuration, PRM operates in Remote Sense. PRM module output voltage is
sensed through divider formed by R29 and R31. U11B is configured as buffer as shown
in Figure 11 and provides the sense voltage to error amplifier U11A. R33, R41 and R27
are left open, reserved for differential sensing and current sensing. R29 is set to limit
the upper trim range based on a maximum reference voltage of 1.25 V. Note that by
default compensation components are not installed and required for operation. Default
compensation components are provided with the board as described in a later section.
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vicorpower.com Applications Engineering: 800 927.9474
Page 21
Remote Sense operating mode using PRM® and VTM®: Non-Isolated Remote Sensing (Differential Sensing)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in
the following illustration.
Figure 13.
ON
OFF
Remote Sense
(differential)
Postion
number
REMOTE SENSE (Differential)
1
2
3
4
5
6
7
8
9
10
Note: To use this configuration, the VTM isolation must be broken by tying VTM -IN and VTM -OUT
together.
The following table describes the switch configuration.
Table 8.
Switch configuration in
differential sensing
Switch
Position
Number
ON or OFF
Connection
1
OFF
TM pin must be left open. This switch position cannot be put in the ON position.
2
ON
PR pin is connected to output of external error amplifier.
3ON
IF pin is connected to output of external current sense amplifier to set the constant current limit.
4ON
RE pin is connected to input of the external voltage reference circuit to generate voltage reference for external error amplifier.
5
ON
VS pin is connected to power VCC of the op-amp and current sense IC.
6
OFF
NC pin must be left open. This switch position cannot be put in the ON position.
7OFF
PRM +OUT pin is NOT connected to local sense (single ended) of the remote sense control circuitry.
8
Don’t care
9ON
VTM +OUT (+SENSE) pin is connected to positive input (+SENSE_B) of the differential buffer of remote sense control circuitry.
10ON
VTM –OUT (-SENSE) pin is connected to negative input (-SENSE_B) of the differential buffer of remote sense control circuitry.
Figure 14.
Remote Sense: non-isolated
remote sensing (differential)
control circuitry
BLUE highlight =
Pre-installed component
GREEN highlight =
user installed component
H 39
Preinstalled component
and connections
H 43
H 41
H 40
1206
C19
H 42
OPEN TP37
User installed
component
OPEN
1206
C22
VCC
SG
1
4
3
VREF
SG
UG:016
vicorpower.com R36
1206
1K
R29
H 47 1206
R31
1206
1.27K
5
7
2
U11A
SO8
OPEN
1206
R32
SG
C21
0603
8
To PR through S10
IMON
TP38
H 45
H 46
R28
1206
20K
C20
1206
4.7nF
EAO
R27
1206
H 44
6
H 51
R33
1206
U11B
R41
1206
H 48
R30
1206
LOCAL SENSE_+
+SENSE_B
To VTM ouput (+S/–S)
through S10 and J10
H 52
-SENSE_B
R42
1206
1.27K
Applications Engineering: 800 927.9474
Page 22
In this configuration, the PRM® and VTM® evaluation boards are connected together to
form a PRM / VTM pair and regulation is performed at the VTM module output. The
+SENSE and -SENSE connections are made at the VTM output through connector J10.
This is a non-isolated configuration and therefore the VTM isolation must be broken
by tying the VTM -OUT and VTM -IN pins together. The VTM evaluation board has
provisions for easily breaking the isolation. U11B is configured as a differential amplifier
with gain set for appropriate output voltage. R33 and R41 set the gain. POT R44 can be
used to set the required voltage at the VTM output. Maximum output voltage can be set
for maximum 1.25 V reference voltage. R33 and R41 is calculated using following equation.
R33 = R41 =
VOUT_SET (MAX) • 1.27kΩ
1.25 V
Equation 1
Where: VOUT_SET (MAX) is the maximum VTM output trim voltage
Please note that R33 and R41 are not populated by default. Sockets can be used to
populate through-hole resistors R33 and R41.
In order to configure the evaluation boards for non-isolated remote sense the following
steps must be taken:
Connect the PRM and VTM evaluation boards together
1. 2. Configure the operating mode switch as described
3. Break the isolation by connecting VTM-IN and -OUT together
4. Calculate and install the appropropriate differential sense resistors (R33 and R41)
5. Install compensation components C20 and R28
Remote Sense Compensation Components
By default, compensation components are not populated, and are required for
operation. Please note that board comes with default through-hole compensation
components C20 and R28 that can be used to get a baseline for Remote Sense operation.
Sockets can be used for easy installation of C20 and R28. These components are not
optimized and will have low bandwidth response. Transient response can be improved
by adjusting the compensation components as outlined in the PRM datasheet.
It is recommended to use a network analyzer to measure the closed loop frequency
response when adjusting compensation. The PRM and VTM boards provide test points
which can be used to inject the network analyzer AC signal and measure the closed loop response.
For PRM Remote Sense mode (single ended local sense), test points TP37/TP38 and H46/
H45 are in series between the PRM +OUT and the voltage sense resistors and should be used.
For PRM-VTM Remote Sense mode (differential sense) test points are provided on the
VTM board in series with the +S connections (Labeled “AC Sig Inj +/-“) and should be used.
Trim and Soft-start Adjustment in Remote Sense Operation
Trim and soft start adjustment in Remote Sense Operation is set by the reference voltage
network shown below. The PRM evaluation board is normally configured for a 20 V to
55 V trim range. Trim POT R44 is used to trim the output voltage in Remote Sense Operation.
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vicorpower.com Applications Engineering: 800 927.9474
Page 23
The slew rate of the output voltage during startup may be controlled by controlling
the rate-of-rise of the voltage at VREF node. This can be achieved using soft-start
capacitance C24. By default, C24 is populated with 0.1 uF ceramic capacitance.
Sockets H55 and H56 can be used for installation of additional through-hole soft-start
capacitance. It is not recommended to extend the soft start beyond 10msec.
Figure 15.
Voltage reference circuit
H55
REF_EN_B
OUT 2
1
IN
C23
3
TP43
R44
C24
R45
1206
GND
0603
VREF
R43
1206
U12
1206
SOT23_3
TP44
SGND
H56
VOLTAGE REFERENCE
Current Limit Adjustment in Remote Sense Operation
In Remote Sense Operation, current feedback is provided externally. The current limit
set point is a function of the current sense amplifier gain, the shunt resistor and the
internal current limit threshold of PRM. Full chip PRM evaluation board has 5 mΩ
current shunt whereas half chip PRM evaluation board has 10mΩ current shunt. The IFB
current limit threshold is fixed at 2.0 V. The gain of the current sense amplifier can be
changed per Equation 2 in order to adjust the current limit. Resistor R26 set the gain of
the current sense amplifier. R25 is the current shunt.
GCS =
VIFB_IL
Equation 2
ILIMIT (SET) • R25
By default, R26 is installed for the current limit approximately 10% above rated output current.
The current limit setpoint can be changed by adjusting the value of R26 and
appropriately setting the gain of the current sense IC.
Slave Operating Mode (Arrays)
Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in
the following illustration.
Figure 16.
ON
OFF
Slave
Postion
number
SLAVE
1
2
3
4
5
6
7
8
9
10
Slave operation is required for constructing arrays of parallel devices as described in the
next section. Switch all the positions to OFF, except position #3. Slave PRMs receive their
control signal (PR) from an external remote sense circuit. Switch at position #3 is on
to enable the constant output current limit. External Remote Sense circuit controls the
array of voltage.
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Page 24
Paralleling
The paralleling and current sharing capability of the devices can be demonstrated by
stacking multiple evaluation board and interconnecting the inputs and outputs with
standoffs of sufficient current rating to create a parallel array. See Figure 17 below. One
board should be configured normally for Remote Sense operation and placed on top for
easy access to control circuitry. The remaining PRMs should be configured as Slaves and
placed underneath.
When paralleling PRMs, the PC, PR and SG pins should be connected together. Dual
paralleling wire to board connectors (J17 and J18) are used for transferring signal pins
(PC, PR and SG) in parallel operation from board to board. These connectors provide
simple strip and insert option and accept 18-24 AWG solid wires. PR and SG wires can
be twisted to minimize noise pick-up. Note that when using J17 and J18, SG pins will be
connected together through an on board 1 OHM series resistors to decouple
signal grounds.
VTM® boards can also be connected in parallel to create high power PRM-VTM arrays.
VTM input and outputs need to be connected in parallel using same size standoffs.
Each VTM requires a VC signal from a PRM® in order to start and it is recommended to
connect one PRM VC to one VTM VC using the connector J13 when possible. If needed
a single PRM VC can be used to drive up to two VTMs (will require additional off board
connections).
Figure 17.
Paralleling of PRM
evaluation board
Top - Master
Bottom - Slaves
Interconnect
signals
Conclusion
The PRM® evaluation board is a flexible tool which allows users to implement and
perform basic testing on various configurations, including PRM-VTM® module
combinations. This user guide covers some basic topics; however, it cannot describe
every scenario. If additional information required, please contact
Vicor Applications Engineering.
The Power Behind Performance
Rev 1.2
12/14
vicorpower.com Applications Engineering: 800 927.9474
Page 25