LM2633 Evaluation Board National Semiconductor Application Note 1
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LM2633 Evaluation Board
LM2633 Evaluation Board
National Semiconductor Application Note 1208 July 2001
When switch slide signal whose label appears beside that slide grounded; Much flexibility built into board. example, possible dual SO-8 Ch2, possible leaded capacitors switching outputs, VDDX voltage (5V) supplied externally, etc.
board shuts down after toggled switch; change voltage setting using switch. Instead, corresponding bits float, then signal generator toggle corresponding terminal(s). Output voltage noisy; large voltage spikes output voltage waveform, with µs/div time base, most probably noise picked your probe. greatly reduce sensitivity your probe radiated noise shortening ground lead.
Specifications
Input Voltage: (don't above because input capacitors rated only); Continuous Load Current: 16A; Output Voltage: DAC-Programmable (0.9V 2.0V); 1.5V; 2.5V; Minimum Steady-State Duty Cycle: (steady-state duty cycle lower than this cause subharmonic oscillations) Switch-Changeable Settings: VID0 VID4 logic levels; ON/SS1 ON/SS2 pins (either grounded connected capacitor); FPWM (either grounded pulled 5V); UV_Delay (either grounded connected capacitor).
Using External Supply Drivers
Using internal VLIN5 power VDDX pins efficiency penalty light loads, especially when input voltage high. there happens external available, make sense external one. However, there timing issue. Namely, external comes late that soft start process output voltages still low, then will activate cause system shut down. work around this potential issue, recommended DIODE rails. course, external needs slightly higher than VLIN5 that latter will supplying VDDX current. this, remove evaluation board, connect external terminal "ext5v".
SpeedstepSetup
There five terminals board. Determine which pins need toggle, corresponding switch slides OFF. signal generator square wave, with frequency below kHz, voltage levels between Connect signal generator corresponding terminal(s) "sgnd" terminal. Enable signal generator after soft start.
Troubleshooting Guide
Board wouldn't start; following: Check switch (S1) setting make sure grounded same time; Check current limit setting input power supply make sure more than during start Disconnect loads; Make sure input voltage between 24V. Power Good flag does high; Make sure 3.3V connected; scope probe used measure voltage, make sure scope termination impedance; Make sure three channels presenting correct voltage. Under-Voltage Shutdown does activate; Make sure grounded switch; Channel will recover after fault condition disappears.
SpeedStep trademark Intel.
Adaptive Voltage Positioning
Adaptive voltage positioning (AVP) technique that lowers output voltage when load heavier raises when load lighter. technique creates more room fast load transients thus saves output capacitors. AVP, open wide trace that shorting pads R17, install current sense resistor. Then adjust amount current feedback needed.
Using NFET with Channel
While Channel maximum, output voltage enough, still possible NFET pass transistor. With this evaluation board, TSOP-6 installed Check "Current Sourcing Capability Voltage" curve data sheet determine NFET used your application.
AN-1208
2002 National Semiconductor Corporation
AN200257
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Connection Diagram
VIEW
PGOOD (Pin 13): constant monitor output voltages. indicates general health regulators. more information, Power Good Truth Table Power Good Function Operation Descriptions, (Pin 16-17): Low-noise analog ground. (Pin 18): Connect base linear regulator transistor. OUT3 (Pin 19): Connect output linear regulator. (Pin 21): feedback input linear regulator, connected center external resistor divider. COMP2 (Pin 22): Channel compensation network connection (it's output voltage error amplifier). (Pin 23): feedback input Channel Connect center output resistor divider. SENSE2 (Pin 24): Remote sense Channel This used skip-mode operation. ILIM2 (Pin 25): Current limit threshold setting Channel sinks constant current. resistor connected between this MOSFET drain. voltage across this resistor compared with MOSFET determine over-current condition occurred Channel (Pin 27): Kelvin sense drain MOSFET Channel (Pin 29): Switch-node connection Channel which connected source MOSFET. HDRV2 (Pin 30): gate-drive output Channel floating drive output that rides voltage. MOSFET Channel CBOOT2 (Pin 31): Bootstrap capacitor connection Channel gate drive. VDD2 (Pin 32): input voltage supply LDRV2 gate driver. LDRV2 (Pin 33): Low-side gate-drive output Channel PGND2 (Pin 34): analog input voltage supply. (Pin 35): Kelvin sense drain MOSFET Channel VLIN5 (Pin 36): output internal linear regulator. Connect ground with ceramic capacitor. This connected supply available) improve efficiency. PGND1 (Pin 38-39): Power ground Channel LDRV1 (Pin 40-41): Bottom gate-drive output Channel VDD1 (Pin 42): input voltage supply LDRV1 gate driver. CBOOT1 (Pin 43): Bootstrap capacitor connection Channel gate drive. HDRV1 (Pin 44): gate-drive output Channel HDRV floating drive output that rides voltage. (Pin 45): Switch-node connection Channel which connected source MOSFET. (Pin 46): Kelvin sense drain MOSFET Channel ILIM1 (Pin 48): Current limit threshold setting Channel sinks constant current. resistor connected between this MOSFET drain. voltage across this resistor compared with MOSFET determine over-current condition occurred Channel
20025701
48-Lead TSSOP (MTD) Order Number LM2633MTD Package Number MTD48
Descriptions
(Pin feedback input Channel Connect load directly. COMP1 (Pin Channel compensation network connection (connected output voltage error amplifier). (Pins 47): internal connection. ON/SS1 (Pin Adding capacitor this provides soft-start function which minimizes inrush current output voltage overshoot; lower than 0.8V input (open-collector type) this turns Channel also both ON/SS1 ON/SS2 pins below 0.8V, whole chip goes into shut down mode. ON/SS2 (Pin Adding capacitor this provides soft-start function which minimizes inrush current output voltage overshoot; lower than 0.8V input (open-collector type) this turns Channel also both ON/SS1 ON/SS2 pins below 0.8V, whole chip goes into shut down mode. VID4-0 (Pins 6-10): Voltage identification code. Each internal pull-up. They accept open collector compatible 5-bit binary code from CPU. code table shown Table UV_DELAY (Pin 11): capacitor from this ground adjusts delay output under-voltage lockout. FPWM (Pin 12): When FPWM low, pulse-skip mode operation light load disabled. regulator forced operate constant frequency mode.
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20025702
LM2633 Evaluation Board
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TABLE Bill Materials (Parts listed installed.) Designator C15, C16, C14, C26, C27, C22, C21, C30, C31, C32, C34, C18, C19, Q10, Q11, Q12, R18, R10, R12, R13, R20, R23, R24, R25,
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Part Specification 56UF, 25V, OSCON 16V, X7R, 16V, X7R, 4700 16V, X7R, 0.01 50V, X7R, 0.015 16V, X7R,
Size RADIAL, 10.3 10.3 Case
Part Type CAPACITOR, OSCON CAPACITOR, TANTALUM CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC CAPACITOR, CERAMIC DIODE, SCHOTTKY INDUCTOR INDUCTOR INDUCTOR N-FET BJT, N-FET N-FET RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR
Part Number 25SP56M T510E108M004AS
Manufacturer Sanyo Kemet
Qty. Board
VJ0805Y151MXJAB Vishay VJ0805Y681MXJAB Vishay VJ0805Y472MXJAB Vishay VJ0805Y103MXJAB Vishay VJ0805Y153MXJAB Vishay VJ0805Y104MXJAB Vishay VJ1206Y334MXAAB Vishay VJ0805S474MXJAB Vishay VJ1206S105MXJAC Vishay BAT54 CEPH149-1R6MC CDRH127-100MC DO3316P-152 2N7002LT1 MMBT2222ALT1 IRF7805 IRF7807 CRCW0805223J CRCW0805222J Vishay Sumida Sumida Coilcraft Vishay Vishay Vishay CRCW0805100J CRCW08051002F CRCW08051622F CRCW08052612F CRCW08054752F CRCW0805104J Vishay Vishay Vishay Vishay Vishay Vishay
50V, X7R, 0.33 50V, X7R, 0.47 16V, X7S, 16V, X7S, 30V, 15.5A, 1206 1206 SOT-23 14.6 14.6
5.4A, 21.6 6.4A, 60V, 40V, 30V, 4.5V, 30V, 4.5V, 22k, 2.2k, 10.0k, 16.2k, 26.1k, 47.5k, 100k, SOT-23 SOT-23 SO-8 SO-8
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TABLE Bill Materials (Parts listed installed.) (Continued) Designator TP1-TP23 Part Specification POSITION SWITCH 0.094" Triple Controller DIP-9 mils TSSOP-48 Size Part Type SWITCH, TERMINAL Part Number 435640-6 160-1026-02-01-00 LM2633 Manufacturer CAMBION National Qty. Board
TABLE Code Output VID4 VID3 VID2 VID1 VID0 Voltage CPU* 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 1.125 1.150 1.175 1.200 1.225 1.250 1.275 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00
*This code 0.900V convenience.
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Layout
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LAYER
20025704
INTERNAL
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Layout
(Continued)
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INTERNAL
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BOTTOM LAYER
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Layout
(Continued)
20025707
DRILL DRAWING
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SILKSCREEN
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LM2633 Evaluation Board
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
AN-1208
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.
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