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AN3861SA
Sensor-less Motor Drive IC for VTR Movie Cylinder
s Overview
The AN3861SA is a sensor-less motor drive IC for VTR movie cylinder. It uses both sensor-less and sine wave drive, thus excellent for low-noise applications.
11.00.3 32 17 Unit : mm
6.10.3 8.10.3
* Operating supply voltage range : VCC=3.0 to 5.5V, VB=4.0 to
10.5V
* Reduced magnetosound using 3-phase full-wave overlap
drive. Built-in power transistor. * Standby mode for minimizing power consumption * Voltage output for controlling SW power supply * Motor neutral point input terminal
1
16 0.650.1 0.2 - 0.05 1.50.2
+ 0.1
(0.5)
0.65 (0.625)
0.3 - 0.05
SEATING PLANE
+ 0.1
SEATING PLANE
32-pin SSOP Package (SSOP032-P-0300)
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol U CS VSC WIN VIN UIN PCV SG SL3 SL2 SL1 FC BR FR HSL STB Description U-phase drive output terminal Drive current output terminal Switching power supply control output terminal W-phase detection terminal V-phase detection terminal U-phase detection terminal Voltage feedback system compensation terminal Signal ground Slope waveform generate terminal (3) Slope waveform generate terminal (2) Slope waveform generate terminal (1) Oscillation terminal Short brake control terminal Forward/Reverse change-over terminal Slope current change-over terminal Stand-by input terminal Pin No. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Symbol VCC IN2H OUT2 IN1- IN1+ MM OUT1 Vref PCI VS VB CS W PG V PG Description Power supply terminal Operational amplifier 2 input terminal Operational amplifier 2 output terminal Operational amplifier 1 reverse phase input terminal Operational amplifier 1 normal phase input terminal Motor neutral point input terminal Operational amplifier 1 output terminal Servo reference voltage input terminal Current feedback system phase compensation terminal Motor drive power supply terminal Unregulated power supply terminal Drive current output terminal W-phase drive output terminal Power ground V-phase drive output terminal Power ground
0.10.1
s Features
s Block Diagram
SW Power Block Vbatt VS
-
0.25 0.1F
SW Power Control Block
+
SG
8
MM
22 27 17
VB
25
PC1
VS CS
26 28 2 3
VSC (Output for VS Control)
VCC Vref OUT 1 IN 1- IN 1+
7
24 23
PCV
VCE Detection
-
Distributor
21 19
Amplifier
OUT 2 IN 2+
18
STB (Low : Stand-by) Forward/Reverse Control FR (High : Forward)
16
14
Conducting Phase Switch Logic
FC
560pF
12
HSL
15
11 0.022F
SL 1 SL 2 SL 3
0.022F 0.022F
-
-
20
Reference Power Supply Sink Side Drive Tr 4
BEMF Detection Comparator
Short Brake
10
9
BR (High : Brake) PG PG
- + +
0.047F
Source Side Drive Tr 0.1F 1 0.1F
+ +
U
31
0.1F
V
29
W
A3
WIN
VIN
5
UIN
6
0.022F x 3
13
30
32
Note) Values of all external C and R are nominal one.
s Absolute Maximum Rating (Ta=25C)
Parameter Supply voltage Unregulated voltage Motor power supply voltage (under VB) Output terminal voltage Output current Power dissipation Note 1) Operating ambient temperature Storage temperature Note 1) Package power dissipation when Ta=75C n=1, 29, 31 n=1, 29, 31 Symbol VCC VB VS Vn IOn PD Topr Tstg Rating 6.0 11 11 11 1000 400 -25 to + 70 -55 to + 150 Unit V V V V mA mW C C
s Recommended Operating Range (Ta=25C)
Parameter Operating supply voltage Symbol VCC VB VS Range 3.0V to 5.5V 4.0V to 10.5V 1.5V to VB
s Package Power Dissipation PD -Ta
1400 1290 1200 1000 800 668 600 400 200 0 Single unit Rthj- a = 187.1C/W PD= 668mW (25C) Glass epoxy board (50 x 50 x 0.8tmm) Rthj - a = 96.9C/W PD=1290mW (25C)
Power Dissipation PD (mW)
0
25
50
75
100
125
150
Ambient Temperature Ta (C)
s Electrical Characteristics (VCC=3.3V, VB=6V, VS=6V, Ta=252C)
Parameter Drive Block Drive gain Drive amplifier offset Output maximum current Brake current Sink-side output voltage Sink-side saturation voltage Source-side saturation voltage Bemf Detection Block Comparator hysteresis width VHCOM 4 16 29 mV Gio ViOCS IOMAX IBR VCE VSAT (1) VSAT (2) IO=100mA IO=500mA IO=500mA VCS OUT1 Input offset voltage of Vref and OUT1 RCS=0.25 0.11 -100 625 200 0.15 0.14 6 750 500 0.25 0.25 0.90 0.35 0.35 1.3 0.17 100 875 mV mA mA V V V Symbol Condition min typ max Unit
s Electrical Characteristics (cont.) (VCC=3.3V, VB=6V, VS=6V, Ta=252C)
Parameter Oscillator Triangular wave oscillation frequency Slope Slope terminal charging current (1) Slope terminal discharging current (1) Slope terminal charging current (2) Slope terminal discharging current (2) Slope terminal charging current (3) Slope terminal discharging current (3) Slope terminal charging current (4) Slope terminal discharging current (4) Operational Amp. 1 only Common-mode input voltage range Input offset current Voltage gain Output sink current (1) Operational Amp. 2 only Common-mode input voltage range Operational Amp. 1 and 2 Input offset voltage Output sink current 1- (2) Output sink current 2- (2) Output source current (2) Mode Switch=HSL, STB, FR, BR Input high level Input low level Input bias current Motor Power Supply Control Input/output gain Output impedance Operation point (1) Operation point (2) Power Supply Current Operating power supply current STB power supply current Unregulated power supply current (1) Unregulated power supply current (2) ICC (1) ICC (2) IBB (1) IBB (2) STB : H STB : L VCC=0V VCC=3.3V, In2+=0V 10 6 0.1 0.3 15 10 10 1.5 mA mA A mA GIOS ZOS VS - U (1) VS - U (2) VS-U for VSC=1.6V when OUT1=Vref VS-U for VSC=1.6V when OUT1=Vref + 1 VSC U 1.4 12 0.1 0.35 2.0 18 0.35 0.63 2.6 24 0.6 0.9 Times k V V VSWH VSWL IBSW VSW=2V 25 2.0 0.6 100 V V A VIOA1, 2 IOSI 1 (2) IOSI 2 (2) IOSA 1, 2 -20 1.8 2 -3 4 4 -15 -2 20 mV mA mA mA VICR (2) 0 VB-1.4 V VICR (1) IIOAI GAI IOSI1 (1) OUT1=0.2V 0.2 -50 60 20 VB -1.4 or VCC 5 50 67 140 V nA dB A ISLC (1) ISLD (1) ISLC (2) ISLD (2) ISLC (3) ISLD (3) ISLC (4) ISLD (4) HSL : L CFC=560pF femf < 160Hz HSL : L CFC=560pF femf > 181Hz HSL : H CFC=560pF femf < 160Hz HSL : H CFC=560pF femf > 181Hz -26 14 -52 28 -52 28 -78 42 -20 20 -40 40 -40 40 -60 60 -14 26 -28 52 -28 52 -42 78 A A A A A A A A fFC CFC=560PF 11.0 16.3 22.8 kHz Symbol Condition min typ max Unit
s Electrical Characteristics [Reference Values] (Ta=252C)
This is design reference value, and not guaranted one. Parameter Thermal protection circuit operation temperature Symbol TSD VCC=3.3V Condition Reference value 175 Unit C
s Pin Descriptions
Pin No. Pin name Standard waveform Description
CS
Equivalent circuit
VB 1
1
U: U-phase drive output
GND
Terminal driving the U-phase of motor
8k GND2
GND
Vs
2
CS : Drive power supply output
Terminal outputting the drive current of motor
Vcc
3
VSC : Switching power supply control output
Terminal outputting the control voltage of the switching power supply
100A 18k 150A 1k GND VB 8k W 1k
3
4
WIN : W-phase detection
GND
Terminal detecting the W-phase
150A GND VB
4
8k
V
5
VIN : V-phase detection
GND
Terminal detecting the V-phase
150A GND VB
1k 5
8k
U
6
UIN : U-phase detection
GND
Terminal detecting the U-phase
150A GND VCC
1k 6
7
PCV : Voltage feedback system phase compensation
GN
Terminal attaching the capacitor for phase compensation of the voltage feedback system
GND
50 1k
7
8
SG : Signal ground
Grounding terminal for signal system
s Pin Descriptions (cont.)
Pin No. Pin name Standard waveform Description
VCC 2I
Equivalent circuit
I
9
SL3 : Slope waveform generation (3)
Terminal generating the waveform of the motor drive current
9
GND VCC 2I
I
10
SL2 : Slope waveform generation (2)
Terminal generating the waveform of the motor drive current
10
GND VCC 2I
I
11
SL1 : Slope waveform generation (1)
Terminal generating the waveform of the motor drive current
11
GND VCC
12
FC : Oscillation
Terminal determining the phase switching frequency at motor start
GND VCC
12
13
BR : Short brake control
VCC or GND
Terminal controlling the short brake
50k GND VCC
13
GND2
14
FR : Forward/Reverse switching terminal
VCC or GND
Terminal switching the normal/reverse rotation of motor
50k 14 50k GND VCC GND2
15
HSL : Slope current control terminal
VCC or GND
Terminal controls the charging/discharging current of the slope waveform generating terminal
GND VCC
50k 15 50k GND2
16
STB : Stand-by input
VCC or GND
Terminal controls the operation/stand-by condition
50k 16 50k GND GND2
s Pin Descriptions (cont.)
Pin No. Pin name Standard waveform Description Equivalent circuit
17
VCC : Power supply
Terminal inputting the V CC power supply
VB 125A
18
IN2H : Operational amp. 2 input
Input terminal for operational amp. 2
3k GND VB
1k 18
GND2
19
OUT2 : Operational amp. 2 output
Output terminal for operational amp. 2
30k GND VB 1.5k 5k
19
20
IN1- : Operational amp. 1 reverse phase input
Terminal inputting the reverse phase voltage of operational amp. 1
25A GND VB 1.5k
1k 20
GND2
21
IN1+ : Operational amp. 1 normal phase input
Terminal inputting the normal phase voltage of operational amp. 1
25A GND
1k 21
GND2
22
MM : Motor neutral point input terminal
Terminal inputting the motor neutral point
22
VB
VCC
23
OUT1 : Operational amp. 1 output
Terminal outputting the output voltage of operational amp. 1
23
VCC Vref
24
Vref : Servo reference voltage input
Terminal inputting the servo reference voltage
GND 100A GND
1k 12k 100A GND2 24
s Pin Descriptions (cont.)
Pin No. Pin name Standard waveform Description
VB
Equivalent circuit
25
PCI : Current feedback system phase compensation
GND
Terminal attaching the capacitor for phase compensation of current feedback system
GND
50 25 1k
26
VS : Motor drive power supply
Terminal inputting the VS motor drive power supply
27
VB : Unregulated power supply
Terminal inputting the VB unregulated power supply
VB Vs 1.5k
28
CS : Drive current output
CS
Terminal outputting the motor drive current
GND CS
1k 28
VB 29 8k
29
W: W-phase drive output
GND
Terminal driving the W-phase of motor
GND2
GND
30
PG : Power block grounding
Terminal connecting the power transistor block to GND
CS
VB
31
V: V-phase drive output
GND
Terminal driving the V-phase of motor
8k GND2
31
GND
32
PG : Power block grounding
Terminal connecting the power transistor block to GND
s Operation Descriptions
(1) STB terminal The operating condition of the IC internal circuit is shown in the following table : STB input L Note) H Condition of the IC internal circuit AMP2 and sensor-less block only operating All circuit operating
Note) Since the sensor-less block operates, if the motor rotates, it detects the inductive voltage and synthesizes the energization switching signal which is synchronized with the motor rotation phase. (2) FR, BR terminal FR terminal H : Forward rotation L : Reverse rotation BR terminal H : Short brake circuit operation L : Short brake circuit stop (3) Drive amplifier The AN3861SA is an IC of current drive type, and the motor drive current Ia is determined by the voltage of OUT1 terminal, as shown in Fig.1. VS - CS
Ia = Rcs
mV Ia max = 140 Rcs
gm = Gio = 0.14 Rcs Rcs
OUT1 Vref
Fig.1 Drive Characteristics The collector voltage value is controlled as shown in Fig.2 since the sink-side output transistor is operated with non-saturation voltage.
U, V, W
0.5V
0.2V
OUT1 Vref Vref + 1.35V
Fig.2 OUT1 and VCE of Sink-side Output Transistor
(4) VCS terminal For the AN3861SA, since the collector voltage of the sink-side output transistor is controlled to a certain value. Therefore, when the VB is high enough, extra voltage is applied to the VCE of source side output transistor. This loss voltage of VCE can be reduced by the VSC voltage through the circuit as shown in the following figure.
1.6V
- +
VS VSC
CS AN3861
Fig.3 Switching Regulater System with VSC Terminal
VSC
OUT1=Vref gm=-2 1.6V
OUT1 > Vref + 1.0V OUT1 increases
0.35V
0.63V
VS - U VS - V VS - W
Fig.4 VSC Characteristics
(5) FC terminal This is an oscillation terminal which determines the commutation frequency at operation start and the frequency femf of inductive voltage for switching over the charging/discharging current of the SL terminal (Refer to (6) below). Normally, fFC=16.3kHz when CFC=560pF and the frequency at operation start is approx. 4Hz. (6) SL1, SL2, SL3 terminal The SL1, SL2 and SL3 are terminals producing the slope waveform for synthesizing the trapezoidal wave current. Since the slope waveform is synthesized by charging/discharging the external capacitor with the constant current, the amplitude VSL becomes as follows :
VSL =
Ich 6 femf x CSL
VSL
GND
Fig.5 Waveform of SL1, SL2 and SL3
Where, Ich : Charging/Discharging current CSL : Capacitance value femf : Frequency of motor inductive voltage The value of Ich is changed according to the relationship between the frequency of the motor inductive voltage and the oscillation frequency of the FC terminal, as shown in Fig.6 in the next page. Therefore, the capacitance value of external capacitor CSL should be selected so that the value of VSL could fall in the range from 0.5 to 1.5V during constant rotation. Since the relative dispersion of three external capacitors may cause increase of motor noise, the capacitor with high accuracy should be used. (7) Capacitance value of Uin, Vin, Win The capacitor of Uin, Vin and Win prevents the malfunction of the comparator due to spike-shaped voltage which is generated in the motor coil at operation start. For this reason, it should be used as necessary for large motor of large L such as winding coil.

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