View SA305_4775067.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

SA305
MICROTECHNOLOGY
FEATURES
* LOW COST 3 PHASE INTELLIGENT SWITCHING AMPLIFIER * 3 FULLY PROTECTED HALF BRIDGES * UP TO 60V SUPPLY * OUTPUT CURRENT - 5 AMPS (CONT) PER HALF BRIDGE * NO "SHOOT THROUGH" CURRENT
APPLICATIONS
* 3 PHASE BRUSHLESS DC MOTORS * 3 INDEPENDENT SOLENOID ACTUATORS
DESCRIPTION
The SA305 is an integrated, fully protected, 3 phase brushless DC motor driver IC. Three independent half bridges provide up to 5A of continuous (10A peak) output current under microcontroller or DSP control. Thermal, short circuit, shoot through, and over current protection are included in this power device. Fault status indication and current level monitors are provided directly to the controller. The SA305 is built using a multi-technology process allowing CMOS logic control and DMOS output power devices on the same IC. Output current is measured using an innovative low loss technique. The SIP package offers superior thermal performance.
23 PIN SIP PACKAGE STYLE EX
EXTERNAL CONNECTIONS
BLOCK DIAGRAM
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
1
SA305
DETAILED BLOCK DIAGRAM (1 PHASE SHOWN)
BLOCK DIAGRAM
TYPICAL APPLICATION
The SA305 offers a level of power integration unmatched by others in the field of fractional HP brushless motor control.

APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PIN DESCRIPTIONS
SA305
PIN DESCRIPTIONS
Pin # 10,21 17 22 13 2 1,23 11 19 18 8
Pin name Vs Vdd OutA OutB OutC PGND SGND DISABLE Warning FAULT
16 15 12 14 7 5 20 3 4 9
PWM_HA PWM_LA PWM_HB PWM_LB PWM_HC PWM_LC IMON_A IMON_B IMON_C OFF
Description High voltage supply (12V-60V) Logic supply (5V) Half bridge output Half bridge output Half bridge output Power ground, high current ground return path of the bridge outputs Analog and logic circuits ground Disable logic Input, CMOS. When high disables all six output MOSFETs and makes the FAULT output high. Do not leave floating at any time. Output pin goes high if Tj rises above 135C and goes low again if TJ falls below 85C. The output pin is high under the following conditions: a) Short-Circuit and Over Current condition. b) When TJ rises above 160C until it falls below 110C. c) When VS rises above 9.8V until it falls below 9.7V. d) Disable pin is activated (pulled high) This can be used as an interrupt to the microcontroller. CMOS logic input: When HIGH, indicates the Pchannel of output A is to be turned on. CMOS logic input: When HIGH, indicates the Nchannel of output A is to be turned on. CMOS logic input: When HIGH, indicates the Pchannel of output B is to be turned on. CMOS logic input: When HIGH, indicates the Nchannel of output B is to be turned on. CMOS logic input: When HIGH, indicates the Pchannel of output C is to be turned on. CMOS logic input: When HIGH, indicates the Nchannel of output C is to be turned on. Current monitor output, approximate current 1/4100 of Phase A current Current monitor output, approximate current 1/3500 of Phase B current Current monitor output, approximate current 1/3800 of Phase C current I/O Pin. Disables all Fault Mechanisms (except under voltage lockout) when pulled LOW. Can be used as a latched fault output but does not indicate undervoltage lockout. Leave this pin floating for normal operation. Do not pull HIGH.
All inputs are CMOS levels. Inputs can accept CMOS levels as low as 3.3 volts. CMOS logic inputs cannot be left floating at any time.
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
3
SA305
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +Vs SUPPLY VOLTAGE, Vdd OUTPUT CURRENT, peak, 200ms POWER DISSIPATION, internal, DC TEMPERATURE, pin solder, 10s TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case VOLTAGE AT CMOS INPUTS
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
60V 5.5V 10A 130W 225C 150C -55 to +125C -40 to +125C -0.3 to +5.5V
SPECIFICATIONS
PARAMETER DIGITAL INPUTS Logic Low Voltage Logic High Voltage Pulsewidth DIGITAL OUTPUTS Source Current POWER SUPPLY Vs Vdd Supply Current, Vs Supply Current, Vdd 9.8 4.5 TEST CONDITIONS MIN TYP MAX 1 UNITS V V nS mA V V mA mA
1.8 200
0.4 60 5.5 35 6
10 KHz (One channel switching at 50% duty cycle), Vs=50V, Vdd=5V 10 KHz (One channel switching at 50% duty cycle), Vs=50V, Vdd=5V Iout = 1A to 5A Iout = 100mA to 5A
5 8.5 4
ANALOG Current Sense Linearity Current Sense Linearity OUTPUT Output Current, continuous Output Current, Peak Turn on delay Turn off delay Switching time, on Switching time, off On resistance, PCHAN FET On resistance, NCHAN FET Short circuit turn off time Thermal Shutdown Thermal Warning Overcurrent Shutdown THERMAL RESISTANCE, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case
0.6
1.5 5 5 10
% % A A nS nS nS nS m m nS C C A C/W C/W C
For 200ms
5A Load (Room Temperature) 5A Load (Room Temperature) 155 10 Full temperature range Full temperature range
183 240 47 52 325 250 300 160 135 12 0.95 12.21
600 600 165
-40
125
NOTES: 1. Unless otherwise noted: TC=25C, power supply voltage is typical rating. (Vs = 50 V, Vdd = 5V). 2. Long term operation at the maximum junction temperature will result in reduced product life. De-rate internal power dissipation to achieve high MTBF.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
4
TYPICAL PERFORMANCE GRAPHS
SA305
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
5
SA305
TYPICAL PERFORMANCE GRAPHS
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
6
OPERATING CONSIDERATIONS
SA305
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +Vs and -Vs must be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the SA305. Use electrolytic capacitors at least 10F per output amp required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R) 0.1F or greater. See the external connections diagram on page 1.
GENERAL
Please read Apex Application Note 1 "General Operating Considerations" which covers stability, power supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex's complete Application Notes library, Technical Seminar Workbook and Evaluation Kits.
GROUND PINS
Analog and Power Grounds should be connected externally at only one point on the motor control board in such a way that there is no current flow through the connection to avoid noise related issues.
CURRENT SENSE
The current of each phase can be read using the IMON output pins. The high side of each half bridge current is monitored separately. The current sense output level is as follows: CHANNEL A: ISENSE_A = IO /4148 + 25A CHANNEL B: ISENSE_B = IO /3491 + 30A CHANNEL C: ISENSE_C = IO /3819 + 35A External power current sense resistors are not required with the SA305. However, in order to read the current level using a standard A/D input a resistor of 1K should be shunted across each output. A standard 1/4W resistor is sufficient here. Motor current adjustments are made through the PWM inputs. Above the internal limit the device self-protects.
PROTECTION
Each of the six output devices includes short circuit protection to prevent damage from direct shorts to GND or VS. The SA305 is protected against overheating with built in thermal monitoring. The thermal protection will engage when the temperature of the MOSFETs reach approximately 160C. The FAULT output pin will go "HIGH" if either protection circuits engages and will place all MOSFETs in the "OFF" state (high impedance output). The most severe condition for any power device is a direct, hard-wired ("screwdriver") short from an output to ground. While the short circuit protection will latch the output MOSFETs off the die and package may be required to dissipate a large amount of power until the protection is engaged. This energy can be destructive, particularly at higher operating voltages, so good thermal design is critical if such fault tolerance is required of the system. The SA305 has an internal FAULT latch mechanism by which the device stays disabled (in case a fault occurs) unless the user resets it. If the SA305 goes into FAULT condition because of short-circuit, over current or high temperature, the DISABLE pin needs to be pulled HIGH (a brief 200ns or more pulse should suffice) to reset the SA305 and resume normal operation. However, before resetting the SA305 the user has to ensure that the FAULT has been eliminated. Please note that under voltage lockout does not set the internal fault latch.
EXTERNAL SCHOTTKY DIODES
External schottky diodes are required because of superior reverse recovery characteristics compared to the internal body diodes.
SA305 OPERATION
The SA305 is used to drive three phase motors but can be used where ever three high current outputs are required. A DSP or microcontroller is used to control and monitor the operation of the SA305. The current through each of the three P channel drive transistors is monitored by on-board circuitry. Current is set using the PWM inputs which drive each FET independently. Once the desired level is reached the inductance of the motor keeps the current near the programmed level. Should the current get to the internally set 12A level, the driver is shutoff to protect itself. Whenever there are no "fault" conditions and the input controls indicate an output should be on, the P and N drivers will turn on. If the input controls are requiring that P-channel turn on before the N-channel turns off, the SA305 will automatically delay the P-channel turn on. The time between the N turning off and the P turning on or the P channel turning off and the N channel turning on is called dead time. An internally set minimum dead time assures no "shoot through" current and gives the clamp diode time to discharge.
CONTROL
Each output MOSFET is controlled by a single input. There is a provision inside the SA305 to prevent the upper and lower FET of the same channel from being active at the same time even though the input controls request that both the N and P devices from one half bridge be on.
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
7
SA305
The warning temperature setting is fixed at TJ = 135C. When the junction temperature gets to the programmed point, the temperature warning bit will be set. It will be reset when the temperature falls below 85C. The Fault temperature setting is fixed at TJ = 160C. Once the Fault temperature has been reached the Fault Output goes high and the outputs of the device are latched off. This output can be used as a microcontroller interrupt. The latch will not be reset until the temperature is below 110C. If more than one output is required to be conducting large currents at the same time, the maximum current will need to be de-rated.
OPERATING CONSIDERATIONS
CURRENT SENSE LINEARITY CALCULATION
The current sense linearity is calculated using the method described below: a) Define straight line (y = mx + c) joining the two end data points where, m is the slope and c is the offset or zero crossover. Calculate the slope m and offset c using the extreme data points. Assume Isense in the y axis and Iload in the x axis. b) Calculate linear Isense (or ideal Isense value, ISIDEAL) using the straight line equation derived in step (a) for the Iload data points. c) Determine deviation from linear Isense (step (b)) and actual measured Isense value (ISACTUAL) as shown below:
This data sheet has been carefully CORPORATION * 5980 reliable, however, no responsibility is assumed for possible inaccuracies* USA * APPLICATIONS HOTLINE:to1 (800) 546-2739 APEX MICROTECHNOLOGY checked and is believed to be NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 or omissions. All specifications are subject change without notice. SA305U REV D AUGUST 2007 (c) 2007 Apex Microtechnology Corp.
8

▲Up To Search▲

Price & Availability of SA305

	To Download SA305 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .