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ADM1070 Hot Swap Controller Evaluation Kit Documentation EVAL-ADM1070EB
ORDERING INFORMATION
FEATURES Full Evaluation Kit for the ADM1070 Hot Swap Controller Kit Contains Two Boards Main Evaluation Board for Bench Evaluation Micro Evaluation Board to Drop into User's System Both Boards Feature On-Board FET to Control Load Current Programmable Operating Voltage Range (R1/R2 Ratio) Programmable Current Limit Levels (Value of RSENSE) Choice of Default or Custom Timing Values Main Evaluation Board Features Edge Connectors Allow for Simulation of Real Hot Swap Events with ADM1070 Residing on Plug-In Module or Backplane External Signals Can Be Switched in through SMB Connectors to Override VIN, SENSE, and UV/OV Signals Microboard Features Drops onto a User's System, Replacing the Current Hot Swap Device EVALUATION KIT CONTENTS
Full ADM1070 Evaluation Kit: The EVAL-ADM1070EB contains the Main Evaluation Board and Micro Evaluation Board. ADM1070 Micro Evaluation Kit: The EVAL-ADM1070MEB contains the Micro Evaluation Board only.
GENERAL DESCRIPTION
This Evaluation Kit allows the ADM1070 negative voltage Hot Swap Controller to be easily evaluated. The ADM1070 provides undervoltage and overvoltage protection by monitoring the supply voltage and provides robust current limiting by monitoring the load current. The device uses a FET in the power path to control the load current. The complete data sheet for the ADM1070 is available from Analog Devices and should be consulted in conjunction with this document.
SETTING UP THE ADM1070 MAIN EVALUATION BOARD
The user can set up the ADM1070 Evaluation Board with various configurations of supply voltage operating range, maximum allowable load current, and timing values as follows: 1. Choose values of resistors R1 and R2 to suit the desired operating voltage range. The default resistors' values (R1 = 39 k, R2 = 1 k) give an operating range of 36.4 V to 76.8 V. See Table IV on page 11 of the ADM1070 data sheet for other resistor ratios and their operating ranges. 2. Choose a maximum load current permitted before the ADM1070 will register a current fault. This is decided by the choice of resistor R6 (RSENSE), see Table I of the ADM1070 data sheet.
* ADM1070 Evaluation Board * ADM1070 Microboard * ADM1070 Data Sheet * Evaluation Kit Documentation (This Document) * Application Note * Five ADM1070 Samples
FUNCTIONAL BLOCK DIAGRAM
0V IN J1 RDROP EDGE CONNECTOR VIN R1 J8 16k J9
ADM1070
GATE UV/OV SENSE Q1
R2 -48V IN -48V IN -48V IN J4 J2 J3 TIMER VEE
RSENSE
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2002
EVAL-ADM1070EB
3. If the default timing values are suitable, place Switch S2 in its default position (toward S1), tying the TIMER pin directly to -48 V. If different timing values are required, Switch S2 to its secondary position. TIMER is now tied to -48 V through the external capacitor C2. The default capacitor value is 220 pF. This capacitor can be changed to generate a different set of timing values. See Table III of the ADM1070 data sheet for a full list of capacitor values and the corresponding timing values.
SWITCH FUNCTIONS J8 (Edge Connector):
Allows connection of a backplane board for powering the board and simulation of hot swap events.
J9 (Edge Connector):
Allows connection of a load board for simulation of hot swap events.
IMPORTANT The following precautions are recommended when using the ADM1070 Evaluation Kit under high voltage conditions:
There are three switches on the ADM1070 Evaluation Board (S1-S3). All switch left/right directions are indicated with the ADM1070 Board in upright position (i.e., red banana connector at the bottom left corner of the board).
Switch 1 (S1):
* Do not work alone. * Always keep one hand in your pocket or behind your back when around a high voltage system. * Wear footwear with a rubber bottom. * Wear eye protection (safety goggles). * Do not wear any jewelry or other articles that could accidentally contact circuitry and conduct current. * Set up your work area away from possible grounds that you may accidentally contact. * Work on an antistatic mat. * Connect/disconnect any test leads with the equipment unpowered and unplugged. Use clip leads or solder temporary wires to reach locations difficult to access. * Perform as many tests as possible with power off and the equipment unplugged. * After tests performed with the power applied, turn off the power and disconnect the power supply from the board. * Remember to fully discharge large load capacitors with an appropriate resistor.
OPERATING THE ADM1070 EVALUATION BOARD
Right Position: Normal operation. The R1-R2 resistor divider generates a voltage level proportional to the supply voltage. This signal is fed into the UV/OV pin of the ADM1070 for undervoltage/overvoltage detection. Left Position: Disconnects the on-board resistor divider from the ADM1070. An external signal can then be fed directly to UV/OV via the SMB connector J7 for testing purposes (i.e., to manually generate an overvoltage/undervoltage fault).
Switch 2 (S2):
Right Position: Ties the ADM1070 TIMER pin directly to -48 V. ADM1070 uses its default timing values. Left Position: Ties the ADM1070 TIMER pin to -48 V through external capacitor C2. ADM1070 timing values now depend on the capacitor value (see ADM1070 data sheet for timing values for various capacitor values). Default external capacitor value is 220 pF. Switch 3 (S3): Right Position: Normal operation. Voltage across the sense resistor is fed into the SENSE pin of the ADM1070. This voltage is used to detect overcurrent faults. Left Position: Disconnects the on-board sense voltage from the ADM1070. An external signal can then be fed directly to SENSE via the SMB connector J6 for testing purposes (i.e., to manually generate an overcurrent fault).
CONNECTORS
There are many different tests and hot swap scenarios that can be modelled on the ADM1070 Evaluation Board: * An overvoltage condition * An undervoltage condition * Powering up into a load (resistive, capacitive, RC combination) * Powering up, then applying a load (resistive, capacitive, RC combination) * Powering up into a shorted output * Powering up, then shorting output * A permanent overcurrent fault * A temporary overcurrent fault * A temporary overcurrent fault followed by a permanent overcurrent fault * Three distinct levels of overcurrent fault (see the Controlling the Current section in the ADM1070 data sheet) Note that all tests involving shorts can be simulated with the ADM1070 residing on both the plug-in module/board side and backplane side. See the ADM1070 Application Note for more details. The ADM1070 Evaluation Board can be configured in two ways to emulate the two ways in which the ADM1070 can be used in a real system. -2- REV. 0
There are nine connectors on the ADM1070 Evaluation Board (J1-J9).
J1 (Banana Connector-Red):
0 V Input Voltage Line
J2 (Banana Connector-Blue/Black):
-48 V Input Voltage Line (Diode OR-ed)
J3 (Banana Connector-Blue/Black):
-48 V Input Voltage Line (Diode OR-ed) J4 (Banana Connector-Blue/Black): -48 V Input Voltage Line (No Diode OR-ing)
J5 (SMB Connector):
VIN voltage can be monitored at J5.
J6 (SMB Connector):
External SENSE voltage can be applied at J6 via Switch S3.
J7 (SMB Connector):
External UV/OV voltage can be applied at J7 via Switch S1.
EVAL-ADM1070EB
1. RESIDING ON A PLUG-IN BOARD
HOT SWAP BACKPLANE BOARD
The typical method of employing the ADM1070 is to mount the device and its accompanying components on a plug-in board. This board is then slotted into the live backplane when required. When the power lines connect, the ADM1070 powers up. If the supply is stable and within tolerance, it turns the MOSFET on in a controlled manner, applying power to the load and powering up the rest of the board.
J8
J9 LOAD BOARD
0V
EVALUATION BOARD -48V
PLUG-IN BOARD 0V RDROP R1 LIVE BACKPLANE ADM1070 R2 LOAD
Figure 2. The ADM1070 Evaluation Board Simulating the Set-Up in Figure 1
-48V RSENSE FET
Figure 1. The ADM1070 Residing on a Plug-In Module
To evaluate the ADM1070 in this type of situation, the Evaluation Board should be set up as follows. First, the board must be set up with the preferred load. The load can be connected to the board in many different ways. * If a single load component will suffice it can be soldered directly onto the Evaluation Board in Position C4. * A load can be connected via Connector J9. The user can custom build a board to simulate a plug-in module's load and plug it into edge Connector J9. (See Figure 11 for a schematic of the J9 pinout.) * The user may connect a load via a crocodile clip directly to the pins of Connector J9 (although care must be taken not to cause a short across the pins of J9). * If a no-load condition is required then nothing should be connected to J9 and no additional load components soldered to the Evaluation Board. Power must now be applied to the board via leads connected directly to a power supply. Power is normally applied through the red and black/blue banana connectors (J1-J4). The higher potential (0 V) should be connected to socket J1 (red). The lower potential of the supply should be connected to J2 or J3 (black). A diode OR-ing scheme is employed at these terminals so that two supplies can be monitored simultaneously if required. In this situation, the supply with the higher potential will be used. If this supply potential drops below the voltage of the second redundant supply, then the board will switch over to the second supply. The diodes can be bypassed by connecting the lower potential power supply to the board via Socket J4 (black). A live insertion event can be recreated by turning on the power supply or by making the connection to the live supply. Care should be taken when applying live voltages to the Evaluation Board.
The user can also apply power to the board via Connector J8. A simple backplane board can be constructed that plugs into Connector J8 and provides the -48 V supply. A live insertion event can now be simulated by plugging the Backplane Board (see Backplane Board section) with a live negative supply into Connector J8. A reseating event can be simulated by disconnecting the Evaluation Board and Backplane Boards and reconnecting them while the supply is live. This corresponds to a plug-in module being manually reseated. This method recreates a board insertion/removal scenario more accurately, since the plugging/unplugging of a board from a live supply triggers the ADM1070's response. Again, the proper precautions should be taken when connecting live voltages to the Evaluation Board.
2. RESIDING ON A BACKPLANE
The ADM1070 can also perform similar undervoltage and overvoltage protection and current limiting functions when placed on the backplane itself.
LIVE BACKPLANE 0V RDROP R1 ADM1070 R2 LOAD
PLUG-IN BOARD
-48V RSENSE FET
Figure 3. The ADM1070 Residing on a Backplane
This type of setup can also be recreated with the ADM1070 Evaluation Board. Power can be applied through a backplane board or with power leads (as described in the previous section). The power supply and the Evaluation Board should be connected together (by either method) and the power applied (see Figure 4). This unit now represents the live backplane with in-built ADM1070 circuitry in Figure 3. A live insertion event can now be simulated by connecting the load to the Evaluation Board (via Connector J9, as described above). Reseating can be represented by disconnecting and reconnecting the load to/from the Evaluation Board.
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EVAL-ADM1070EB
HOT SWAP BACKPLANE BOARD J8
LOAD BOARD
LOAD BOARD
J9
0V EVALUATION BOARD
A schematic diagram of a possible load board that emulates the load on a plug-in module and connects to Connector J9 is shown below. This board contains a series resistance and capacitance connected in parallel. A set of jumpers changes the manner in which the components are applied: resistor only, capacitor only, RC in parallel, or short circuit. The board should be set up via the jumpers before power is applied. For example, to set up the load board to emulate an RC load, shorting links should be placed into both LK1 A and B jumpers and LK2 should be left open.
-48V
Figure 4. The ADM1070 Evaluation Board Simulating the Setup in Figure 3
Note that the ADM1070 can be employed on BOTH the plugin board/module and the backplane sides of a system. This will provide the system with double protection.
SIGNAL MONITORING
P1-1 P1-2 P1-3 P1-4 P1-5 P1-6 P1-7 P1-8
2 LK2 1 R1 R2 R3 R4
4 B 3
2 A 1
LK1
+
C1
When the Evaluation Board is under testing, many different signals can be monitored. There are 12 test points on the board (T1-T12). T1: 0 V Input (and Output) Line T2: Voltage at ADM1070 UV/OV Pin T3: Voltage at ADM1070 TIMER Pin T4: -48 V Input Line T5: -48 V Input Line T6: Voltage at ADM1070 VIN Pin T7: Voltage at ADM1070 GATE Pin T8: Voltage at ADM1070 SENSE Pin T9: Voltage at Source Terminal of MOSFET (normally fed into ADM1070 SENSE pin). Voltage between this node and VEE is the voltage across RSENSE, which is used for current sensing. T10: -48 V Input Line T11: 0 V Input (and Output) Line T12: Voltage at MOSFET Drain Terminal. Lower potential of output load voltage.
P1-9 P1-10 P1-11 P1-12
Figure 5. Schematic Diagram of Possible Load Board
BACKPLANE BOARD
The user can also employ a Backplane Board that emulates the backplane side of a user's system. This board provides an alternative way of applying power to the ADM1070 Evaluation Board (instead of power connectors J1-J4 of Evaluation Board). The Backplane Board should be inserted into edge Connector J8 of the ADM1070 Evaluation Board to apply power to the board. This may be useful when simulating live insertion and removal events with the ADM1070 Evaluation Kit, especially when simulating a situation where the ADM1070 resides on a plug-in module. A live insertion event can be recreated by plugging the Backplane Board (with a live supply) into the ADM1070 Evaluation Board (into Connector J8).
BANANA P1-1 P1-2 P1-3 P1-4 P1-5 P1-6 P1-7 P1-8 J1
BANANA P1-9 P1-10 P1-11 P1-12 J2
Figure 6. Schematic Diagram of Possible Backplane Board
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EVAL-ADM1070EB
MICROBOARD
The ADM1070 Evaluation Kit contains a second Evaluation Board. The ADM1070 Micro Evaluation Board is designed to drop onto a plug-in module or a backplane, replacing the current hot swap device. The performance of the ADM1070 can then be evaluated within the user's system.
The board contains:
INTEGRATING THE ADM1070 MICROBOARD WITH THE USER'S SYSTEM
* On-board FET to control load current * Programmable operating voltage range (R1/R2 ratio) * Programmable current limit levels (value of RSENSE) * Programmable timing values (Capacitor C1)
J1-2 RDROP 0V
The user must modify his or her current system to remove the existing hot swap circuitry and replace it with the ADM1070 Mircoboard. The following description refers to a situation when the hot swap circuitry resides on a plug-in module. The same method applies to cases where a backplane side hot swap system is implemented. First, the existing hot swap device and its accompanying components must be located. The user must then disconnect this portion of the system by cutting the relevant tracks on the board, or alternatively, removing the relevant components.
CUT
PLUG-IN BOARD
16k
0V
VIN R1 J1-1 -48V OUT
ADM1070
GATE UV/OV SENSE Q1
LIVE BACKPLANE
HOT SWAP SYSTEM
LOAD
R2 TIMER C2 VEE
RSENSE
-48V
J1-3
-48V IN
Figure 7. Microboard Functional Block Diagram
This Microboard contains the external components required by the ADM1070 to function on the plug-in module or backplane. By cutting various tracks around the current hot swap device and soldering the ADM1070 Microboard in position above it, the ADM1070 and its external components can be integrated into the system in place of the original hot swap circuitry. The ADM1070's performance can now be evaluated in the system itself.
SETTING-UP THE ADM1070 MICROBOARD
CUT
Figure 8. Removing Existing Hot Swap Circuitry from the User's System
The user can set up the ADM1070 Evaluation Board with different configurations of supply voltage operating range and maximum allowable load current as follows: 1. Choose values of resistors R1 and R2 to suit the desired operating voltage range. The default resistors' values (R1 = 39 k, R2 = 1 k) give an operating range of 36.4 V to 77.2 V. See the ADM1070 data sheet for other resistor ratios and their operating ranges. 2. Choose a maximum load current permitted before the ADM1070 will register a current fault. This is decided by the choice of resistor RSENSE. See the ADM1070 data sheet for full details. 3. The board is set up to use default timing values. A shorting link is mounted on the board in place of Capacitor C1, tying the TIMER pin directly to -48 V. If different timing values are required, a capacitor must be soldered into position in place of the shorting link. TIMER is now tied to -48 V through the external capacitor C1. Different values of C1 generate different timing values. See the ADM1070 data sheet for a full list of capacitor values and the corresponding timing values. REV. 0 -5-
The ADM1070 Microboard can now be integrated into the user's system in place of the original hot swap system. The board should be soldered into position above the old hot swap circuitry. The ADM1070 Microboard has an insulating coating on its underside to protect the user's system. If the underside of the board was not protected, shorts could occur on the module or backplane below it.
SOLDER
PLUG-IN BOARD 0V -48V IN LIVE BACKPLANE TERMINAL BLOCK 0V
-48V OUT LOAD
ADM1070
-48V MICRO BOARD
SOLDER
Figure 9. Integrating the ADM1070 Microboard into the User's System
EVAL-ADM1070EB
EXAMPLE
The user wants to simulate a live insertion event with the ADM1070 Evaluation Board. The user's application operates with a -48 V supply voltage. The plug-in board load can be represented by a capacitive load of 100 F. The ADM1070 will be mounted on the backplane.
Set Up:
GATE
T
SENSE
T
1. Resistor values of R1 = 39 k and R2 = 1 k should be used for a -48 V supply (see Table IV, page 11, ADM1070 data sheet). Default resistor ratio used. 2. User's maximum load current = 1.4 A. An RSENSE of 47 m gives maximum load current = 1.3 A (see Table I, ADM1070 data sheet). Default value used. 3. Default timing values can be used. Switch 2 placed in Position A. The Evaluation Board should be set up as described in the Residing On a Backplane section. A 100 F load should set up (Default Capacitor C4 = 100 F load). To generate the wave forms below on an oscilloscope, the following test points should be monitored. GATE Waveform: Connect an oscilloscope probe between T7 (GATE) and T5 (-48 V). SENSE Waveform: Connect an oscilloscope probe between T8 (SENSE) and T10 (-48 V). VOUT Waveform: Connect an oscilloscope between T11 (0 V) and T12 (-48 V OUT). The oscilloscope should be set to trigger on the rising edge of the GATE voltage. A live insertion event can be modeled by inserting the load board into the Evaluation Board Connector J9. Great care should be taken when handling and connecting live boards.
VOUT
CH1 5.00V CH3 10.0V
CH2 100mV
M 500 s
CH1
2.8V
Figure 10. Live Insertion Waveforms
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R4 8.2k T11 R3 8.2k C4 100 F (REPRESENTS LOAD) T12 J9-12 J9-11 J9-10 J9-9 T5 J5 T7 G T2 VIN S1 5 UV/0V T8 1 S3 J5 T9 R5 S2 3 VIN R2 1k 4 TIMER U2 T5 C2 220pF UV/0V 5 GATE T10 6 T3 SENSE 4 TIMER VEE 2 R6 47m C6 U1 J7 GATE 6 3 D Q1 S R1 39k C3 1 F J9-8 J9-7 J9-6 J9-5 J9-4 J9-3 J9-2 J9-1
T1
RED
VDD 0V
J8-8 J8-7 J8-6 J8-5 J8-4 J8-3 J8-2 J8-1
ADM1070
Figure 11. ADM1070 Evaluation Board Circuit Diagram
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ADM10705KT 1
SENSE VEE 2 T4
C1 0F
J8-12 J8-11 J8-10 J8-9
C5
J4 BLACK
J2
BLACK
-45
D1
EVAL-ADM1070EB
J3
BLACK
-48V
D2
EVAL-ADM1070EB
Evaluation Board Bill of Materials
Part Type ADM1070 ADM1070_SKT CAP, 0.1 F CAP, 0.1 F CAP, 1 F CAP+, 100 F CAP CAP RES, 39 k RES, 1 k RES, 8.2 k 0.25 W RES RES1206, 0R47 IRFR3910 DIODE BANANA BANANA SMB CON\12P\ED\SKT SW-SPDT-SLIDE TESTPOINT Stick-on Feet
Ref Des U1 U2 C1 C2 C3 C4 C5 C6 R1 R2 R3, R4 R5 R6 Q1 D1, D2 J1 J2-J4 J5-J7 J8, J9 S1-S3 T1-T12
Part Decal SOT-23-6 SOT-23-6_SKT 805 805 805 CAP_ELEK_8MM 805 805 805 805 1206 805 1206 DPAK DO35 BANANA BANANA SMB CON-12P-156-SRA SW-SPDT-SLIDE TESTPOINT Stick-on Feet
Part No. ADM1070 FEC 302-7363 FEC 755-849
Source ANALOG DEVICES FARNELL
(Notes)
(NOT MOUNTED) FARNELL (NOT MOUNTED) (NOT MOUNTED) (NOT MOUNTED) FEC 912-049 FEC 911-859 FEC 512-849 FEC 156-231 FEC 706-486 FEC 505-950 FEC 150-039 FEC 150-040 FEC 310-682 S5061-ND FEC 733-647 FEC 240-333 FEC 148-922 FARNELL FARNELL FARNELL (NOT MOUNTED) FARNELL FARNELL FARNELL FARNELL FARNELL FARNELL DIGIKEY FARNELL FARNELL 3M
Figure 12. ADM1070 Evaluation Board Component Side Silkscreen
Figure 13. ADM1070 Evaluation Board Solder Side
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Silkscreen
Figure 14. ADM1070 Evaluation Board Component Placement Drawing
J1-2 GND
R3
R4
J1-1 -48VOUT
R1
3 VIN 5 UV/OV GATE SENSE 6 1 2
G
D Q1 S
R2
4
TIMER U1
VEE
R5
ADM1070
C1
J1-3 -48VIN
Figure 15. ADM1070 Microboard Circuit Diagram
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Figure 16. ADM1070 Microboard Component Side Silkscreen
Figure 18. ADM1070 Microboard Component Placement Drawing
Figure 17. ADM1070 Microboard Solder Side Silkscreen
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Microboard Bill of Materials
Part Type ADM1070 RES, 39 k RES, 1 k RES, 8.2 k 0.25 W RES1206, 0R47 IRFR3910 CON\POWER3
Ref Des U1 R1 R2 R3, R4 R5 Q1 J1
Part Decal SOT-23-6 805 805 1206 1206 D2PAK CON\POWER3
Part No. ADM1070 FEC 912-049 FEC 911-859 FEC 512-849 FEC 156-231 FEC 706-486 FEC 151-786
Source ANALOG DEVICES FARNELL FARNELL FARNELL FARNELL FARNELL FARNELL
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C02925-0-10/02(0)
PRINTED IN U.S.A.

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