EVALUATION KIT FOR TC642/TC646/TC647/TC648/TC649 BDC FAN CONTROLLERS

Transcription

1 EVALUATION KIT FOR TC64/TC646/TC647/TC648/TC649 BDC FAN CONTROLLERS FEATURES Complete Evaluation / Prototyping Vehicle for Microchip s TC64, TC646,TC647, TC648 and TC649 BDC Fan Controllers Works with Any BDC Fan User Prototyping Area Configurable Output Driver Circuit External or Internal Control Voltage Convenient User Test Points BOARD SCHEMATIC GENERAL DESCRIPTION is a fully assembled 4 inch by 6 inch circuit board that allows the user to evaluate and prototype brushless DC fan control circuits using Microchip s TC64, TC646, TC647, TC648 and TC649 BDC fan controllers. The fan speed control signal can be provided by an external sensor or voltage signal, or from the on-board control voltage pot. Minimum speed setting (TC64/TC647) and auto shutdown threshold (TC646/TC648/TC649) are conveniently set by an on-board pot. Jumper blocks allow the user to quickly configure the output stage and input signal source and scaling. Test points provide easy access for instrument readings at critical nodes. A user prototyping area is provided for dedicated circuitry or other user-specific circuits. REG1 TP7 IN 1 3 OUT TC55RP300 GND POT (Min Speed/ Shutdown Level) C3 1 µf POT 1 (Speed Control) REF1 LM INT EXT C µf TP5 External Sensor Input BP1 BP GND BP3 FAN FAN + TO-0 C TO-9 NA* B E B C E SOT-3 SHDN/ RESET EXT SHDN/ RESET TB C1* 1 µf JB4 1 3 JB1 4 TP1 C µf V IN C F V MIN (V AS ) GND TC64* (TC646) (TC648) (TC647) (TC649) Q4 N3906 R1 60 FAULT SENSE V OUT FAULT TP R5 30k TP6 TP4 C8 4.7 µf R* 1.1k 1 JB JB 3 4 C4 C5*, 0.1 µf R4 R3* 4.7 Ohms TP3 * Indicates normal value Dashed Line = Factory Setting Figure 1.

2 1 TABLE OF CONTENTS 1 Table of Contents What Is Included With the / What You Must Provide 3 Before Getting Started 4 Hardware Description 5 Getting Started (Factory Settings) 6 Operation in the Adjustable Output Voltage Mode Appendix A: Board Component Placement/Test Points Appendix B: Bill of Materials

3 WHAT IS INCLUDED WITH / WHAT YOU MUST PROVIDE The items in Table 1 should have been included when you received the. If any of them are damaged or missing, contact Microchip Technology Inc. or the distributor from which you received the kit for assistance. Certain items must be provided by the user to implement a system. They are listed in Table. Table 1. Packing List Item No. Quantity Description x 6 printed circuit board with components installed 1 This user s manual 3 TC647VOA device samples 4 TC649VOA device samples 5 TC648VOA device samples 6 TC647VPA device samples 7 TC649VPA device samples 8 TC648VPA device samples 9 1 TC647 data sheet 10 1 TC649 data sheet 11 1 Fan control article 1 1 TC648 Data Sheet 3 BEFORE GETTING STARTED Please complete the following steps: 1. Check the contents you received against the Packing List (Table 1).. Read the section What Is Included With the / What You Must Provide, and assemble the necessary items. 3. Perform the steps outlined in Getting Started. Table. What You Must Provide Item No. Quantity Description 4 HARDWARE DESCRIPTION The supports evaluation of the TC64/646/ 647/648/649 BDC fan controllers from Microchip Technology Inc. Various jumper options and sites for userinstalled components allow the to operate with virtually any BDC fan. As shown in Figure 1 (page 1), the operates with either a TC64, TC646, TC647, TC648 or a TC649 installed in the 8-pin DIP socket. (The TC646/649 has an auto shutdown mode, whereby the fan is shut off when measured temperature is below a prescribed minimum. The TC64/647 operates the fan continuously, and at a minimum speed when measured temperature is low. For details, please refer to the datasheets for these devices.) As shipped from the factory, the is configured to operate as a TC64/647 that directly drives a 1V BDC fan having a 100mA maximum operating current. The TC64, TC646, TC647, TC648 and TC649 modulate fan speed in direct proportion to the control signal applied to pin 1. This input can be supplied by an off-board sensor, or from the on-board speed control (Pot 1), depending on the setting of the INT/EXT switch. The minimum fan operating speed (TC64/647) or auto shutdown temperature setting (TC646/648/649) is determined by the setting of Pot. In addition,the TC64/646/647/648/649 can be manually shut down (or reset) by pushing the SHDN/RESET switch or applying closed contacts (or a low impedance) to the EXT SHDN/RESET input (TB4). Be sure JB4 is set to match the device (i.e. TC64, TC646, TC647, TC648 or TC649 currently in service). The BDC fan modulation frequency should be between 30Hz and 60Hz. This frequency is determined by capacitor C1 (or user installed capacitor C), and the setting of JB1. The default operating frequency is 30Hz (please see the TC64, TC646, TC647, TC648 and TC649 datasheets for details). The output driver can be either a SOT, a TO-9 or a TO-0 transistor, depending on the fan operating current and application. Resistor R sets the base drive current for this transistor. The configuration as shipped from the factory consists of a NA transistor and a 1.1K base resistor, V, 50mA regulated power supply 1 Power supply with the required output voltage and current capability to operate item 1 from Table Small flat-bladed screwdriver for adjusting the speed control and minimum speed/autoshutdown pots 4 1 DVM 5 1 General purpose oscilloscope 6 Clip leads for power supply and fan connections 7 1 1V, 75mA to 100mA Brushless DC Fan* *Note: The TC64/646/647/648/649 will work with any BDC fan. A 1V, 75 ma to 100 ma fan is recommended for initial start-up since the is pre-configured for this type of fan. If a 1V, 75mA to 100mA BDC fan is not available, the configuration settings of the must be modified accordingly (see Section 5 for details). 3

4 which will drive a BDC fan with an operating current of 100 ma or less. Larger fans can be driven with a different combination of base resistor and output trasistor. Fan commutation pulses are sensed by pin 5 of the TC64/646/647/ 648/649 through R3 and C5. R3 may vary from 1Ω to 10Ω, depending on the operating current of the fan being driven.the is shipped from the factory with a 4.7Ω resistor installed for R3. C5 is a non-critical component and is shipped with a 0.1µF capacitor installed. This value will suffice for all but the most esoteric BDC fans. A fault visual indicator is also provided to facilitate experimentation. The FAULT LED is driven active by Q4 whenever the FAULT output of the TC64/646/647/648/649 goes low. The various jumper blocks and options are summarized in Table 1. 5 GETTING STARTED Initial start-up of the is simplified by using a 1V BDC fan with an operating current between 75mA to 100 ma for the initial start-up. (The is shipped preconfigured for such a fan). If such a fan is available, please proceed to step 1 below. If such a fan is unavailable, the will require modification to certain component values and jumper settings. Please proceed to Section is shipped from the factory configured as outlined in Table 1. Inspect the settings on the board to ensure they match those listed in Table 1. Also be sure that a 4.7Ω resistor is installed for R3, a 1.1kΩ is installed for R, a 0.1µF capacitor is installed for C5, and a NA transistor is installed for Q.. Connect the positive side of a 5V DC supply to (BP1) and the negative side of the supply to GND (BP). 3. Connect the positive lead of a 1V, 100mA (max) BDC fan to the FAN+ terminal. Connect the negative lead of the fan to the FAN- terminal. Table 3. Jumper Options 4. Connect the positive lead of a 1V DC supply to V FAN (BP3). Connect the negative lead from the 1V DC supply to ground. 5. Set the INT/EXT switch to INT (Internal control voltage). Turn Pot 1 (Speed Control) fully clockwise. Turn Pot (Min Speed/Auto Shutdown Level) fully clockwise. 6. Turn both DC supplies ON. The fan should immediately run to full speed and the FAULT L.E.D. should be lit. If this is not the case, re-check the configuration settings and repeat steps 1 through Connect the positive lead of a DC voltmeter to test point TP1 and the negative voltmeter lead to ground. (This is the minimum speed setting voltage). Adjust Pot until a reading of 1.9V is achieved. This voltage corresponds to a minimum speed setting of approximately 40 percent of full speed. 8. Verify proper operation of the TC64/647 by rotating Pot 1 counterclockwise. The fan speed decreases and the FAULT L.E.D. goes off. Fan speed will decrease as Pot 1 is rotated counterclockwise until the voltage on the wiper of Pot 1 is less than the voltage on the wiper of Pot, at which time the fan will operate continuously at 40 percent of full speed. Verify the minimum speed circuit is operating by adjusting Pot clockwise, while Pot 1 is fully counterclockwise. 9. Verify open fan detection by disconnecting one lead of the fan while it is running. The FAULT L.E.D. will light after a disconnect time of about one second. 10. Verify stuck rotor detection by blocking the fan while it is running. The FAULT light will be activated approximately two seconds after the fan is blocked. The may now be custom-configured for your particular combination of control and fan requirements. This is detailed in Section 6. Jumper Shorting Block Function Factory Blocks Installed Setting JB1 1 to TC64/646/647/648/ Hz timebase enabled Shorted 3 to 4 TC64 timebase determined by user-installed capacitor C Open JB 1 to.5ω sense resistor selected Shorted 3 to 4 User-installed sense resistor R4 selected Open JB3 1 to 0.1µF sense capacitor selected (adequate for nearly all BDC fans) Shorted to 3 User-installed sense capacitor C4 selected Open JB4 to 64 configured for TC64/647 Shorted to 646 configured for TC646/648/649 Open 4

5 6 OPERATION IN THE ADJUSTABLE OUT- PUT VOLTAGE MODE Output Driver Transistors such as NA are recommended for use as the output driver. These transistors are low cost, multiple sourced and have a high enough Beta for BDC fan applications of 00mA or less running current. If a single transistor is used, care must be taken to select a transistor having a guaranteed minimum h FE of at least 50 to ensure that the maximum output current specification (5mA) of the TC64/646/647/648/649 is not exceeded. For larger BDC fans, two such transistors connected as a Darlington pair will suffice (Figure ). All component selections should be made based on information in the Applications section of the TC64, TC646, TC647, TC648 and TC649 datasheets. The table shown in Figure is provided as a guide only, and lists typical Fan Module operating configurations for 1V fan applications. The values in the table assume the use of low cost, bipolar transistors (such as NA). Substituting a logic level MOSFET, such as a BS170, for Q results in lower system voltage losses, and significantly reduces output loading on the TC64/646/647/648/649. The low R DSON of the MOSFET (1W in the case of the BS170) enables it to be used instead of the Darlington in high current fan applications (please see the TC64/646/ 647/648/649 datasheet Applications section for details). The pin-out of many logic level MOSFETs is reversed from that of bipolar junction transistors, so care must be taken to properly orient the MOSFET. Sensor Interface Circuit The TC64, TC646, TC647, TC648 and TC649 datasheets provide detailed information relating to the design of a temperature sensor based on a low-cost thermistor. To Fan ( ) From TC64/646/648 Pin 7 R NA NA R3 Darlington Output Stage Full Speed Darlington Single R R3 Fan Motor Current Pair Transistor 50mA X.4K mA X 1.1K mA X mA X mA X 5.6K.4 50mA X 4.7K.0 300mA X 3.9K mA X 3.3K mA X 3.0K mA X.4K 1. Figure. Single Transistor and Darlington Output Configurations 5

6 APPENDIX A: COMPONENT PLACEMENT/TEST POINTS BP1 VDD BP GND BP3 VFAN TP1 TP5 TP7 GND VMIN JB4 SHDN/ RESET Pot (Min/Autoshdn) Pot 1 (Speed Control) C3 VREG 1 VDD JB1 C1 FAULT R1 C6 Q4 VREf 1 C7 U1 TC64/646 EXT INT VIN FAN(+) R5 C8 JB R4 R3 C4 C5 JB3 R B SOT3 EC Q TP3 TP6 TP4 TP TO0 Q3 6

7 APPENDIX C: BILL OF MATERIALS Component Value R1 60Ω, 1/4 Watt, 5% carbon resistor R 1.1 kω, 1/4 Watt, 5% carbon resistor R3 4.7Ω, 1/4 Watt, 5% carbon resistor R4 Not installed R5 30kΩ, 1/4 Watt, 5% carbon resistor Pot 1, Pot 1kΩ board-mounted potentiometer SW-1 Miniature SPDT toggle switch (INT/EXT Switch) SW- Miniature SPDT push button switch (INT/EXT Switch) U1 TC647, TC648, TC649 (Two each provided as samples) BP1 BP3 Banana receptacle C1 1µF tantalum capacitor C Not installed C3 1µF tantalum capacitor C4 Not installed C5 0.1µF ceramic capacitor C6, C7 0.01µF ceramic capacitor C8 4.7µF tantalum capacitor REF-1 LM385, 1.V reference REG-1 TC55RP300EZB 3.0V, % regulator Q1 Not installed (SOT-3 site) Q NA NPN bipolar transistor Q3 Not installed (TO-0 site) Q4 N3906 PNP bipolar transistor LED-1 Miniature L.E.D. JB1 JB4 SIP header terminal strips 7

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