Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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SMH4811
Distributed Power Hot-Swap Controller
FEATURES Supply Range ±20VDC >±500VDC Versatile Card Insertion Detection Supports Both Multi-length Systems Card Injector Switch Sensing Control powering-on DC/DC Converters Highly Programmable Host Voltage Monitoring Programmable Under- Over-voltage Detection Programmable Power Good Delay enabling DC/DC Converter
Preliminary
Programmable Circuit Breaker Function Programmable Over-current Filter Programmable Quick-TripCircuit Breaker Values 2.5V 5.0V reference outputs Easy Expansion External Monitor Functions
Quick-Trip reaker ircu
ASSOCIATE MEMBER
FUNCTIONAL BLOCK DIAGRAM
EN/TS
current limit
Filter Vgate Sense
Vgate
Drain Sense
Programmable Delay
2.5V
2.5V 5.0V
PD1# PD2#
ENPG
CBSense
Programmable Delay
Programmable Quick Response Voltage
SUMMIT MICROELECTRONICS, Inc.
Orchard City Drive, Suite
SUMMIT MICROELECTRONICS, Inc. 1999 2044-03 9/23/99
Duty Cycle Timer
CBFault#
2044 B1.1
Campbell, 95008
Telephone 408-378-6461
408-378-6586
www.summitmicro.com
Characteristics subject change without notice
SMH4811
Preliminary Symbol Drain Sense Vgate EN/TS PD1# PD2# CBFault# CBSense 2.5V ENPG Description Drain sense input Output MOSFET gate Enable/Temp Sense input Detect (active Detect (active Circuit Breaker Fault output Circuit Breaker Sense intput Negative Supply Connection Under Voltage input Over Voltage input reference output 2.5V reference output Connect Enable input Power good output Positive supply connection
2044 T2.1
CONFIGURATIONS
Drain Sense Vgate EN/TS PD1# PD2# CBFault# CBSense
ENPG 2.5Vref 5.0Vref
2044 ILL1.1
RECOMMENDED OPERATING CONDITIONS Condition Temperature -40°C +85°C
2044 T3.0+
DESCRIPTION SMH4811 designed control swapping plug-in cards operating from single supply ranging from 500V. SMH4811 hot-swap controller provides under-voltage over-voltage monitoring host power supply, drives external power MOSFET switch that connects supply load, also protects against over-current conditions that might disrupt host supply. When input output voltages SMH4811 controller within specification, SMH4811 provides "Power Good" logic output that used turn loads, e.g. isolated-output DC-DC converter, drive status light. Additional features SMH4811 include: temperature sense master enable input, 2.5V reference outputs expanding monitor functions, "Pin-Detect" enable inputs fault protection, duty-cycle over-current protection.
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SMH4811
Preliminary ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias Storage Temperature Voltage pins with respect CBSense, Drain Sense PD1#, PD2#, ENPG, EN/TS CBFault#, Vgate Lead Solder Temperature secs) -0.5V -0.5V 0.5V -0.5V 0.5V 0.5V -55°C +125°C -65°C +150°C
*COMMENT Stresses listed under Absolute Maximum Ratings cause permanent damage device. These stress ratings only, functional operation device these other conditions outside those listed operational sections this specification implied. Exposure absolute maximum rating extended periods affect device performance reliability.
OPERATING CHARACTERISTICS (Over Recommended Operating Conditions, Voltages relative VSS) Symbol Vref5 ILOAD5 Vref2.5 Vref2.5 ILOAD2.5 VUVHYS VOVHYS VVGATE IVGATE VSENSE VSENSE ISENSE VQCB Parameter Supply Voltage 5Volt Reference Output 5Volt Reference Output Current Volt Reference Output Volt Reference Output Volt Reference Output Current Power Supply Current Under voltage Threshold Under voltage Threshold Under voltage Hysteresis Over voltage Threshold Over voltage Threshold Over voltage Hysteresis Vgate Output Voltage Vgate Current Output Drain Sense threshold Drain Sense threshold Drain Sense Output Current Circuit Breaker Threshold Quick-Trip Circuit Breaker Threshold Notes Output Enabled Min. 4.75 2.475 2.425 -0.2 2.475 2.425 2.475 2.425 Typ. Max. Units 5.25 2.525 2.575 2.525 2.575 2.525 2.575 VSENSE Option Option Option Option 2.475 2.425 2.525 2.575
VENTS VENTS VENTSHYS
EN/TS Threshold EN/TS Threshold EN/TS Hysteresis Input High Voltage ENPG, CBReset# Input High Voltage ENPG CBFault# Output Voltage Output
ISINK
2.475 2.425 -0.1
2.525 2.575 Vref5
2044 T4.3
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SMH4811
Preliminary Timing Characteristics, -40oC +85oC Symbol tPDD tCBD Description Detect Delay Vgate enable 50mv Circuit Breaker Delay (Filter) Power Good Delay tFSTSHTDN tCYC Fast Shut Down Delay From Fault Vgate Circuit Breaker Cycle Mode Cycle Time Sec. Min. Typ. Unit
11V13V
2.5V 2.5V
tPDD
PD1#/PD2#
Vgate
2.5V
Drain Sense
50mV
CBSense
<tCBD
2044 ILL2.0
Figure Power Sequencing Timing Characteristics
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SMH4811
Preliminary
tCBD
50mV
tCBD
CBSense tCYC
Vgate
2044 ILL3.2
Figure Circuit Breaker Timing
QCBV
<tCBD
50mV CBSense tFSTSHTDN Vgate
2044 ILL6.0
Figure Circuit Breaker Timing Quick-Trip
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SMH4811
Preliminary SMH4811 Descripiton NAME (Pin Drain Sense Drain Sense input monitors voltage drain external power MOSFET switch with respect VSS. When MOSFET turned Drain Sense input will driven will used enable conditions outputs. This will prevent premature activation outputs. Vgate Vgate output activates external power MOSFET switch. constant current source (100µA typical) allowing easy programming MOSFET turn slew rate. EN/TS Enable/Temperature Sense input master enable input. When EN/TS LOW, Vgate, outputs off. name suggests, EN/TS input used master enable host system alternatively circuit over-temperature protection using external thermistor. PD1# PD2# detect pins active inputs that prevent power sequence before add-in card properly seated. Both inputs must before either Vgate outputs enabled. applications where multi-length connector pins use, inputs should tied short pins. mating connector side pins opposite should tied directly VSS. Alternatively, either both inputs tied card injector handle switches, insuring power sequencing will occur until card properly seated. CBFault# CBFault# open drain active output, indicating circuit breaker status. When over current condition detected CBFault# driven low. CBSense circuit breaker sense input used detect overcurrent conditions load connected power MOSFET. value sense resistor (RS) tied series with MOSFET switch; tied other switch CBSense input. voltage drop greater than 50mV (for greater than tCBD) across resistor will result circuit breaker tripping. programmable "quick-trip" sense point also available. CBSense input transitions above threshold, circuit breaker will immediately trip. connected negative side supply. under-voltage (11) over-voltage (12) input pins monitor supply voltage SMH4811 downstream circuits. Both inputs have 2.5V threshold their respective comparators. less than 2.5V greater than 2.5V, Vgate will disabled. 5.0V (11) 5.0V precision volt output reference voltage expand logic-input funtions SMH4811. reference output with respect VSS. 2.5V (12) 2.5V precision volt output reference voltage expand logic-input funtions SMH4811. reference output with respect VSS. ENPG (14) ENPG input used independently switch output. When ENPG pulled low, output immediately placed high impedance state. (15) open drain active output with internal pull-up. enabled after Vgate been turned delayed after Vgate active. used switch second load DC/DC converter. (16) positive supply connection. internal shunt regulator connected between develops approximately volts that supplies SMH4811. resistor must placed series with limit regulator current application illustrations). PROGRAMMABLE FEATURES Because SMH4811 electrically programmable fine-tuned wide variety applications prior shipment customer. Because this manufacturer common part type across wide range boards that used common host have different electrical loads, power-on timing requirements, host voltage monitoring needs etc. This ability common solution across many platforms shifts focus design away from designing power interface each board concentrating value added back-end logic. Because programming features done final test combinations (all possibilities) readily available shelf stock items.
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SMH4811
Preliminary Power Good Delay delay timer that controls delay from Vgate being asserted typical values 5ms, 20ms, 80ms 160ms. Quick-Trip Circuit Breaker Threshold Quick-Trip circuit breaker threshold 200mV, 100mV, 60mv OFF. This threshold voltage drop across that placed between CBSense. Circuit Breaker Delay circuit breaker delay defines period time voltage drop across greater than 50mV less than VQCB before Vgate output will shut down. This effectively filter prevent spurious shutdowns Vgate. delays that programmed 5µs, 50µs, 150µs 400µs. Detect Detect function enabled disabled. DEVICE OPERATION Power-Up Sequence SMH4811 integrated power controller swappable add-in cards. device operates from single supply ranging from 500V generates signals necessary drive isolated output DC/DC converters. SMH4811 hot-swap controller provides under-voltage over-voltage monitoring host power supply, drives external power MOSFET switch that connects supply load. also protects against over-current conditions that might disrupt host supply. When input output voltages SMH4811 controller within specification, SMH4811 provides "Power Good" logic output that used turn load drive status light. There master enable/temperature sense input 2.5V reference outputs expanding monitor functions. Insertion Process add-in board inserted into backplane, physical connections must made with chassis discharge electrostatic voltage potentials. board then contacts long pins backplane that provide power ground. soon power applied SMH4811 starts does immediately apply power output load. Under-voltage over-voltage circuits inside controller check input voltage within user-specified range, detection signals determine whether card seated properly. tPDD after these requirements met, hot-swap controller enables Vgate turn power MOSFET switch. Vgate output current limited IVGATE, allowing slew rate easily modified using external passive components. During controlled turn-on period, MOSFET monitored drain sense input. When drops below user-specified voltage power output considered resistor diode series with drain sense input determine Vds(ON). Provided there sustained over-current condition during start-up, SMH4811 turns loads with Power Good logic outputs. Three DC/DC converters connected outputs their turn-on sequenced pre-programmed delays. sustained over-current condition occurs during after insertion process, then Vgate shorted MOSFET switch turned protect host supply. Circuit Breaker Operation SMH4811 provides circuit breaker function protect against over current conditions. sustained overcurrent event could damage host supply and/or load circuitry. board's load current passes through series resistor connected between MOSFET source/ CBSense controller. breaker will trip whenever voltage drop across series resistor greater than 50mV more than tCBD, will trip instantaneously voltage drop exceeds VQCB. When breaker trips, Vgate output turned CBFault# will driven duty-cycle mode, circuit breaker resets automatically after fixed time period. over current condition still exists after reset, circuit will re-trip. MOSFET switched holding CBReset input value over-current sense resistor determined following formula: 50mV/Ioc where value sense resistor over current limit determined board's power requirement limit host supply. Current Sense Resistors Current sense resistors available from number sources come basic formats: open sense resistors current sense resistor chips. open resistors metal strips that available both thru-hole surface mount. resistor chips surface mount offer excellent thermal characteristics. Both styles available resistance ranges from milliohm ohm. (www.irctt.com) source these resistors. open sense resistors found their OARS series, chip resistors found their series.
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SMH4811
Preliminary Load Control SMH4811 designed control single DC/DC converter, other loads, which incorporate ON/OFF control. Power Good output activates load when following conditions have been met: input voltage SMH4811 monitored within user-defined limits external MOSFET switched delays built into SMH4811 allow correct sequencing power loads. delay time factory programmed. output withstand capability high voltages must connected this pin. Inexpensive bipolar transistors will boost withstand voltage that host supply, figure connections. Output Slew-Rate Control SMH4811 provides current limited Vgate turn-on. fast turn-off performed internally shorting Vgate Vss. Changing passive components around power MOSFET switch will modify turn-on slew-rate. Operating High Voltages breakdown voltage external active passive components limits maximum operating voltage SMH4811 hot-swap controller. Components that must able withstand full supply voltage are: input output decoupling capacitors, protection diode series with DrainSense pin, power MOSFET switch capacitor connected between drain gate, highvoltage transistors connected power good outputs, dropper resistor connected controller's pin. Over-Voltage Under-Voltage Resistors following examples, three resistors, connected inputs must capable withstanding maximum supply voltage which several hundred volts. trip voltage inputs +2.5V relative Vss. input resistances very high, high value resistors used resistive divider. divider resistors should high stability, metal-film resistors keep under-voltage over-voltage trip points accurate. Telecom Design Example hot-swap telecom application uses power supply with -25% +50% tolerance, i.e. supply vary from 72V. formulae calculating shown below. First select peak current, IDmax, allowed through resistive divider, 250µA. value current arbitrary; however, current high, self-heating become problem (especially high voltage systems), current value becomes very large expensive tolerance.
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calculated from:
over-voltage trip point, i.e. 2.5V, therefore:
2.5V =10K minimum current that flows through resistive divider, IDmin, easily calculated from ratio maximum minimum supply voltages:
Therefore:
value calculated using IDmin.
Vuv)
Where under-voltage trip point, also 2.5V, therefore: (36V 2.5V) 268K
closest standard resistor value 267K calculated using:
2.5V 125µA
-10K (20K 10K)
SMH4811
Preliminary Dropper Resistor Selection SMH4811 powered from high-voltage supply dropper resistor, dropper resistor must provide SMH4811 (and loads) with sufficient operating current under minimum supply voltage conditions, must allow maximum supply current exceeded under maximum supply voltage conditions. dropper resistor value calculated from: max) (IDD Iload) APPLICATIONS CIRCUITS Reversing Polarity Power Good Outputs open-drain Power Good outputs SMH4811 active output polarity changed active when required, with minor circuit change around high-voltage buffer transistor, Figure 1N4148 blocking diode must included prevent high-voltage damage SMH4811. Temperature Sensing SMH4811 2.5V reference outputs SMH4811 make easy expand enable monitoring inputs. circuit Figure illustrates low-voltage comparator used make over-temperature detector. comparator draws power from output SMH4811 uses 2.5V reference switching threshold. resistor that causes SMH4811 shut down when maximum ambient temperature exceeded. temperature trip point altered changing and/or resistor adds hysteresis around comparator prevent oscillation near trip point.
Where Vsmin lowest operating supply voltage, Vddmax upper limit SMH4811 supply voltage, minimum current required SMH4811 operate, Iload additional load current from 2.5V outputs between Vss. min/max current limits easily using dropper resistor except circumstances where input voltage swing over very wide range, e.g. input varies between 100V. these circumstances necessary zener diode between handle wide current range. zener voltage should below nominal regulation voltage SMH4811 that becomes primary regulator. MOSFET Vds(ON) Threshold drain sense input SMH4811 monitors voltage drain external power MOSFET switch with respect Vss. When MOSFET's below user-defined value switch considered Vds(ON) adjusted using resistor, series with drain sense protection diode. This protection blocking diode prevents high voltage breakdown drain sense input when MOSFET switch OFF. inexpensive 1N4148 diode offers protection 75V. Vds(ON) threshold calculated from: Vds(ON) threshold calculated from:
Vsense (Isense Vdiode (IsxRs)
Where Vdiode forward voltage drop protection diode, current flowing through circuit breaker sense resistor Vds(ON) threshold varies over temperature temperature dependence Vdiode. Using 100k gives approximate Vds(ON) threshold
2.5V (10µA 100K) Vdiode 1.0V
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SMH4811
Preliminary
+48V
+48V
PD1# ENPG PD2#
100nF
CBFault#
MMBTA06LT1 100K
Host Backplane
SMH4811
EN/TS 2.5V
CBSense
100nF
Vgate
Drain Sense
100K
1N4148 100nF
10nF 100V
100nF 100V
4.7µF 100V
resistor must located close possible MOSFET
@TMAX LMV331
2044 ILL7.2
Figure basic distributed power Swap using SMH4811. Note relative length power pins `pin detect' pins. physical implementation insures add-in card power SMH4811, power backend circuits cannot turned until card properly seated. Note 2.5Vref 5Vref outputs they support peripheral circuits. this example, ENPG pulled high self-generated 5Vref. shaded circuit temperature sensor that effectively safety shut down circuit tied into EN/TS input. LMV331 drives output low, will immediately turn Vgate output. Refer datasheet text details calculating values
+48V
PD1# ENPG PD2#
100nF
EN/TS CBFault#
SMH4811
1N4148
MMBTA06LT1
CBSense Vgate
10nF 100V resistor must located close possible MOSFET
2044 ILL8.2
Drain Sense
100K 1N4148
100nF
100nF
100nF 100V
4.7µF 100V
Figure This generic Swap implementation with +48V supply illustrating changing polarity output. EN/TS ENPG under control host system.
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SMH4811
Preliminary
+48V
EN/TS ENPG
PD1#
.01µF
CBFault# +VIN
.01µF
47µF
.01µF
+VOUT DC/DC Converter
.01µF 47µF
PD2#
100nF 100nF
SMH4811
100K
-VIN
ON/OFF
-VOUT
.01µF
CBSense
Vgate
Drain Sense
100K
1N4148
MMBTA06LT1
Close proximity remote off/on circuit required proper performance
100nF
10nF 100V
resistor must located close possible MOSFET
2044 ILL9.2
Figure typical +48V distributed power Swap application circuit controlling DC/DC converter with remote off/on function. should noted board layout DC/DC converters critical proper operation. Most manufacturers will have detailed technical notes assist with this. excellent note "Application Guidelines OnBoard Power Converters" from Lucent Technologies.
100K
case connections places .01µF
EN/TS ENPG
PD1#
CBFault#
DC/DC Converter +VIN
.01µF 47µF
+VOUT
.01µF 47µF
.01µF 47µF
100nF
SMH4811
100K
-VIN
ON/OFF
-VOUT
.01µF .01µF
PD2#
100nF
CBSense
Vgate
Drain Sense
100K
1N4148
MMBTA06LT1
100nF
10nF 100V
-48V
100K
resistor must located close possible MOSFET
2044 ILL10.2
Figure typical +48V distributed power Swap application circuit controlling dual DC/DC converter with remote off/on function. Note: detect inputs must connected input when card inserted, input.
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SMH4811
Preliminary SSOP Package Drawing Dimensions
JEDEC MO-137
hx45°
SSOP ILL.0
Common dimensions .061 .064 .068 .004 .006 .0098 .055 .058 .061 .008 .010 .012 .0075 .008 .0098 Variations .150 .155 .157 .025BSC .230 .236 .244 .010 .013 .016 .016 .025 .035 Count Variations
This Table Inches Count Dimension .189 .194 .196 .337 .342 .344 .337 .342 .344 .386 .391 .393
.0020 .0500 .0250 .0250
Dimension .0045 .0070 .0525 .0550 .0275 .0300 .0280 .0300
Common dimensions 1.55 1.63 1.73 0.12 0.15 0.25 1.40 1.47 1.55 0.20 0.25 0.31 0.19 0.20 0.25 Variations 3.81 3.94 3.99 0.635 5.84 5.99 6.20 0.25 0.33 0.41 0.41 0.64 0.89 Count Variations
This Table Millimeters Count Dimension 4.80 4.93 4.98 8.56 8.69 8.74 8.56 8.69 8.74 9.80 9.93 9.98
0.05 1.27 0.64 0.64
Dimension 0.11 0.18 1.33 1.40 0.70 0.76 0.71 0.76
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SMH4811
Preliminary 16-Lead Small Outline Package (SOIC)
0.390 0.005 .0085 .0010 (After Plating)
0.236 0.008
0.155±0.005
Index
0.151 0.005
0.005
0.016 0.003
0.05
DETAIL
.016 ±.002 0.054 0.005 0.069 .004 .007 .003 0.390 0.005 0.007 0.003 0.023 0.005 0.041
Note: Reference: JEDEC publication MS-012 360-120 Unit: Inches Mold flash, protrusion gate burr shall exceed 0.006 inch side.
0.024 0.002
DETAIL
16.soic-ILL.1
ORDERING INFORMATION
SMH4811 Base Part Number Package SOIC SSOP Power Good Delay 20ms 80ms 160ms
Detect Function Blank Enabled Disabled Circuit Breaker Delay 400µs 150µs 50µs Quick-Trip Threshold 200mV 100mV 60mV 2044 ILL11.0
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SMH4811
Valid Part Number Combinations
SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811
Preliminary
2044-03 9/23/99
SMH4811
Preliminary
2044-03 9/23/99
SMH4811
Preliminary
NOTICE SUMMIT Microelectronics, Inc. reserves right make changes products contained this publication order improve design, performance reliability. SUMMIT Microelectronics, Inc. assumes responsibility circuits described herein, conveys license under patent other right, makes representation that circuits free patent infringement. Charts schedules contained herein reflect representative operating parameters, vary depending upon user's specific application. While information this publication been carefully checked, SUMMIT Microelectronics, Inc. shall liable damages arising result error omission. SUMMIT Microelectronics, Inc. does recommend products life support applications where failure malfunction product reasonably expected cause failure life support system significantly affect safety effectiveness. Products authorized such applications unless SUMMIT Microelectronics, Inc. receives written assurances, satisfaction, that: risk injury damage been minimized; user assumes such risks; potential liability SUMMIT Microelectronics, Inc. adequately protected under circumstances. Copyright 1999 SUMMIT Microelectronics, Inc.
2044-03 9/23/99

Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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