Brushless DC motor controller

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1 NE/SA7 DESCRIPTION The NE/SA/SE7 is a three-phase brushless DC motor controller with a microprocessor-compatible serial input data port; 8-bit monotonic digital-to-analog converter; PWM comparator; oscillator; three Hall sensor inputs and six source/sink phase pre-drivers. FEATURES 8-bit DAC Serial-to-parallel converter Output pre-drivers Entire switch mode conversion Adaptable to 6 or 2 commutation Overcurrent protection APPLICATIONS Motor controller for three-phase brushless DC motor Robotics Computer peripherals PIN CONFIGURATION DATA CLOCK CE RESET DAC REF IN OSC OUT Rt/Ct LOOP FILTER 2 8 LOOP FILTER FEEDBACK IN D, N Packages NON-IN 2 3 TOP IEW NOTE:. Available in large SO (SOL) package only. DD PHASE H PHASE L PHASE 2H PHASE 2L PHASE 3H PHASE 3L HS HS 2 HS 3 CURRENT SENSE GND ORDERING INFORMATION DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG # 24-Pin Plastic Dual In-Line Package (DIP) to +7 C NE7N 42A 24-Pin Small Outline Large Package (SOL) to +7 C NE7D 73D 24-Pin Plastic Dual In-Line Package (DIP) -4 C to +8 C SA7N 42A 24-Pin Small Outline Large Package (SOL) -4 C to +8 C SA7D 73D 24-Pin Plastic Dual In-Line Package (DIP) - C to +2 C SE7N 42A August 3,

2 NE/SA7 BLOCK DIAGRAM DATA CLOCK CE 2 3 DATA REGISTER MR Q Q Q2 Q3 Q4 Q Q6 Q7 Q8 Q Q 24 DD HS3 HS2 HS GND 23 PHASE H D D D2 D3 D4 D D6 D7 D8 D8 LDR D7 D6 D D4 LCTL 22 PHASE L RESET 4 DAC REGISTER LOAD MR Q Q Q2 Q3 Q4 Q Q6 Q7 Q8 CNTL MR Q8 ENABLE REGISTER Q7 Q6 Q Q4 PGO 2 BRAKE CMD BRAKE ENABLE LOCK BRAKE DECODE LOGIC 2 2 PHASE 2H PHASE 2L PHASE 3H DAC REF IN DAC CW/CCW CYCLE CMD 8 PHASE 3L OSC OUT Rt/Ct LOOP FILTER SAWTOOTH GENERATOR 2 ERROR AMP PWM S R LOOP FILTER Q Q R S FDBK I SENSE COMP + OR AMP + IN. 4 I SENSE 2 NON IN ABSOLUTE MAXIMUM RATINGS SYMBOL PARAMETER RATING NE7 SA7 SE7 Temperature range T A Operating ambient to 7-4 to 8 - to 2 C T J Operating junction - to - to - to C T STG Storage -6 to -6 to -6 to C DD Power supply Logic inputs, all -.3 to -.3 to -.3 to August 3, 4 2

3 NE/SA7 RECOMMENDED OPERATING CONDITIONS SYMBOL PARAMETER RATING T A Ambient temperature range NE Grade to 7 C SA Grade -4 to 8 C SE Grade - to 2 C T J Junction temperature range NE Grade to C SA Grade -4 to C SE Grade - to 4 C DD Supply voltage.6 to 4.4 DC ELECTRICAL CHARACTERISTICS Limits apply at DD =2 ±%, REF = and over operating temperature range unless otherwise specified. Typical data applies at T A =2 C SYMBOL PARAMETER TEST CONDITIONS Oscillator SA/NE7 SE7 Min Typ Max Min Typ Max f O Frequency initial accuracy T A =2 C, R T =2.4kΩ, C T =22nF khz f C Frequency drift over temp R T =2.4kΩ, C T =22nF khz Supply voltage sensitivity T A =2 C ±2 ±2 %/ Output pulse width T A =2 C, R T =2.4kΩ, C T =22nF ns Motor Phase Pre-Drivers t R t F Rise time Fall time R L =2kΩ to Gnd, C L =2nF [ to ] R L =2kΩ to CC, C L =2nF [ to ] I SOURCE OH =8 8 8 I OUT I SINK OL = ns ns ma I SOURCE =ma.8.8 OH OUT I SOURCE =8mA (over temp) 8 8 I SINK =ma.4.4 OL I SINK =8mA (over temp) PWM Comparator Current Sense Comparator TH Current sense trip level m t PD Error Amplifier Propagation delay to output drivers C L =2nF 2 2 ns CM Input common-mode voltage range OL Large-signal voltage gain OUT = to 7 7 db PSRR Power supply rejection ratio 6 6 db O Output voltage swing IN =+m, I L =-µa IN =-m, I L =+µa DC ELECTRICAL CHARACTERISTICS (Continued) Limits apply at DD =2 +%, REF = and over operating temperature range unless otherwise specified. Typical data applies at T A =2 C. August 3, 4 3

4 NE/SA7 SYMBOL PARAMETER TEST CONDITIONS Operational Amplifier SA/NE7 SE7 Min Typ Max Min Typ Max OS Offset voltage m CM Input common-mode voltage range T A =2 C Over temp. OL Large signal voltage gain OUT = to 7 7 db PSRR Power supply rejection ratio 6 6 db O Output voltage swing IN =+m, I L =-µa IN =-m, I L =+µa CMRR Common-mode rejection ratio R S =kω db GBW Gain bandwidth R F =kω 2 2 khz NN Input noise voltage F=kHz 3 3 n/ Hz Digital-to-Analog Converter Resolution 8 8 bits INL Integral non-linearity error ± ±2 ± ±2 LSB DNL Differential non-linearity error ±. ± ±. ± LSB FS Full-scale gain error Error amp. A = ±.2 ±.8 ±.2 ±.8 %FS Full-scale temperature drift REF T C =ppm/ C 2 2 ppm/ C ZS Zero-scale offset error Error amp. A = ± ±2 ± ±2 LSB Z IN Input impedance (DAC ref. in) kω t S Settling time to ±. LSB µs t PLH Propagation delay time (high) Through DAC 2 2 ns t PHL Propagation delay time (low) Through DAC 2 2 ns Logic Inputs IH Input voltage: TTL high IL Input voltage: TTL low.8.8 I IH Input current: TTL high ± ± µa I IL Input current: TTL low ± ± µa Supply Current I DD ma NOTES:. Monotonicity guaranteed over operating temperature range. August 3, 4 4

5 NE/SA7 TYPICAL PERFORMANCE CHARACTERISTICS FREQUENCY (khz) NE7 Oscillator Frequency CC = 2 C T ( µ F) 2 3 R T = k R T = 2k R T = K Oscillator Frequency vs R T and C T T A = 2o C R T = k R T = 3k R T = 2.4k R T = 2k R T = k I CC (MA).. /div NE7 Oscillator Frequency vs Supply oltage T A = o C T A = +2o C T A = +2o C OSCILLATOR FREQUENCY (khz)...6/div (). CC = () THRESHOLD OLTAGE (m) NE7 Oscillator Output Pulse Width ON OFF CC = 2 GAIN (db) NE7 Op Amp Gain CC = CURRENT SENSE THRESHOLD (m) NE7 Current Sense Comparator Threshold CC = I CC vs CC NE7 Logic Threshold oltage 8 4 T A = 2o C 7 CC = 2 SUPPLY OLTAGE () 3 2 PULSE WIDTH (ns) FREQUENCY (khz) August 3, 4

Switched-mode power supply control circuit

Switched-mode power supply control circuit DESCRIPTION The /SE6 is a control circuit for use in switched-mode power supplies. It contains an internal temperature- compensated supply, PWM, sawtooth oscillator, overcurrent sense latch, and output