ETC AD6392

AD6392
4-CH MOTOR DRIVE IC
DESCRIPTIONS
AD6392 is a 4-CH BTL driver suitable for driving motors and actuators in CD-P/VCD-P systems. Each
channel drivers except the spindle driver have an
internal primary filter and they can be directly connected to the servo’s PWM output without any attached external components.
28SSOPH-375B
FEATURES
ORDER INFORMATION
- 3-CH BTL driver compatible with PWM input
(PWM input is filtered by an internal primary filter,
so there is no need to attach external components)
- 1-CH BTL spindle driver with analog input
- Built-in TSD (thermal shut down) circuit.
- Built-in mute circuit.
- Operating supply voltage (4.5V~13.2V).
Device
Package
Operating Temp
AD6392
28SSOPH-375A
-35OC ~ +85OC
AD6392
28SSOPH-375B
-35OC ~ +85OC
BLOCK DIAGRAM
PGND
DO4F
DO4R
28
27
26
VBINA
VSIN
VBIN
VCC2
24
23
22
25
PGND
VCC1
IN3F
IN3R
RCIN3
21
20
19
18
DO3R
DO3F
17
16
MUTE
15
BIAS
REV
100K
FWD
150K
INTERFACE
190K
LEVEL SHIFT
MUTE
TSD
1
DO1F
2
DO1R
April. 2002 (Rev.0)
FWD
3
4
5
6
7
RCIN1
IN1R
IN1F
REFI
REFO
PGND
REV
INTERFACE
FWD
REV
INTERFACE
8
9
10
11
12
13
SGND
IN2F
IN2R
RCIN2
DO2R
DO2F
www.interpionsemi.com
14
PGND1
-1-
AD6392
4-CH MOTOR DRIVE IC
PIN CONNECTIONS
AD6392
PIN DESCRIPTIONS
NO
1
2
SYMBOL
DO1F
DO1R
I/O
DESCRIPTION
O
CH1 forward output
O
CH1 reverse output
3
RCIN1
I
CH1 external
capacitor / resistor
4
IN1R
I
CH1 reverse input
5
IN1F
I
CH1 forward input
6
REFI
I
Reference input
Reference output
7
REFO
O
8
SGND
-
Signal ground
9
IN2F
I
CH2 forward input
10
IN2R
I
CH2 reverse input
11
RCIN2
I
CH2 external
capacitor / resistor
12
DO2R
O
CH2 reverse output
13
DO2F
O
CH2 forward output
14
PGND1
-
Power ground 1
April. 2002 (Rev.0)
NO
SYMBOL
I/O
15
MUTE
I
Mute
16
DO3F
O
CH3 forward output
17
DO3R
O
CH3 reverse output
18
RCIN3
I
CH3 external
capacitor / resistor
19
IN3R
I
CH3 reverse input
20
IN3F
I
CH3 forward input
21
VCC1
-
Power supple voltage 1
22
VCC2
-
Power supple voltage 2
23
VBIN
I
24
VSIN
I
CH4 input
25
VBINA
I
CH4 bias input
(with internal resistor)
26
DO4R
O
CH4 reverse output
27
DO4F
O
CH4 forward output
28
PGND2
-
Power ground 2
www.interpionsemi.com
DESCRIPTION
CH4 bias input
-2-
AD6392
4-CH MOTOR DRIVE IC
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS
SYMBOL
VALUE
UNIT
Maximum supply voltage
VCCmax
18
V
Power dissipation 1 (375A_Type)
Pd 1
1.7 *
W
Power dissipation 2 (375B_Type)
Pd 2
2.3 *
W
Operating temperature
Topr
-35 ~ +85
O
Storage temperature
Tstg
-55 ~ 150
O
C
C
Note>
1. When mounted on 100mm X 100mm X 1mm PCB (Phenolic resin material).
2. Power dissipation reduces 13.6 mW/OC(375A_Type), 18.4 mW/OC(375B_Type), for using above Ta=25OC
3. Do not exceed Pd and SOA.
Power Dissipation (W)
POWER DISSIPATION CURVE
3
375B_Type
2
375A_Type
1
0
25
50
75
100
125
150
175
Ambient Temperature (°C)
RECOMMENDED OPERATING CONDITIONS
CHARACTERISTICS
SYMBOL
VALUE
UNIT
Operating Supply Voltage
VCC1,2
4.5~ 13.2
V
April. 2002 (Rev.0)
www.interpionsemi.com
-3-
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS
(VCC1=VCC2=8V, f = 1kHz, RL = 8ohm, Ta = 25OC unless otherwise specified.)
CHARACTERISTICS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
Icc
No Load
-
6.5
-
mA
PREFO Pin Voltage
Vbias
-
3.40
3.70
4.00
V
PREFO Pin Voltage Variance
Vbias
1mA Source, sink
-30
-
30
mV
All Mute On Voltage
Vamon
Pin6=variation
-
-
0.5
V
All Mute Off Voltage
Vamoff
Pin6=variation
2.0
-
-
V
Mute On Voltage
Vmon
Pin15=variation
-
-
0.5
V
Mute Off Voltage
Vmoff
Pin15=variation
2.0
-
-
V
Mute on current
Imute
-
-
-
3
mA
Input High Level Voltage
Vih
-
2.4
-
-
V
Input Low Level Voltage
Vil
-
-
-
0.5
V
Input High Level Current
lih
Vin = 5V
50
100
150
uA
Input Low Level Current
lil
Vin = 5V
-
0
-
uA
-40
-
+40
mV
Quiescent Circuit Current
[ DRIVE PART (CH1,CH2,CH3) ]
Output Offset Voltage 1,2,3
Voo
Output High Level Voltage
Vohd
FWD = 5V, REV = 0V
5.2
5.8
-
V
Output Low Level Voltage
Vold
FWD = 0V, REV = 5V
-
1.1
1.6
V
Constant Current
-
Iconst
-
14
22
30
uA
Internal integral Capacitance
C
-
-
24
-
pF
Current Pulse rise time 1
tr
At startup
-
0.08
1
us
Current Pulse fall time 2
tf
At shutdown
-
0.55
1
us
-160
-
160
us
Current Pulse time differential
tr-f
-
Drive Linearity
LIN
Vin = Vref±0.5, 1, 1.5V*1
90
100
110
%
Ripple Rejection
RR
Vin = 100mVrms, 100Hz
-
70
-
dB
*1. If Vo = Vo1 when Vin = Vref±0.5V, Vo = Vo2 when Vin = Vref±1.0V, and Vo = V3
when Vin = Vref±1.5V, then Lin = (Vo3/Vo2)(Vo2/Vo1)X100%
April. 2002 (Rev.0)
www.interpionsemi.com
-4-
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS
(VCC1=VCC2=8V, f = 1kHz, RL = 8ohm, Ta = 25OC unless otherwise specified.)
[ DRIVE PART (CH4) ]
Input Bias Current
lb
-
-
-
300
nA
Common mode input range
Vicm
-
1.6
-
6.4
V
Maximum Output Voltage High
Vohs
-
5.2
5.8
-
V
Maximum Output Voltage Low
Vols
-
-
1.1
1.6
V
Voltage Gain
Gvc
-
8
10.5
13
dB
Output offset voltage 4
Voos
-
-60
0
60
mV
Slew Rate
SR
-
-
2
-
V/us
Ripple Rejection Ratio
RRs
-
70
-
dB
April. 2002 (Rev.0)
Vin = 100mVrms, 100Hz
www.interpionsemi.com
-5-
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY
- Mute function through power reference or signal reference pins
Muting all channel drivers can be obtained through power reference or signal reference pins. Fig.1 shows
the simplified schematic diagram for power/signal reference mute.
Fig. 1 Power reference, Signal reference & all mute function
Pin6, Pin23, Pin25
Mute
Above 1.0V
off
Below 1.0V
on
April. 2002 (Rev.0)
As it can be seen in Fig. 1, pin6, pin23 and pin25 are connected
to the positive input terminals of comparators, and the internal
1.0V reference is connected to the negative input terminals.
Thus, if the voltage applied to each pins falls below 1.0V, Q1
and Q2 become on and hence the bias currents for all channel
drivers become to be shut down. Thus all mute function can be
carried out.
www.interpionsemi.com
-6-
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY (Continued)
- Mute function through MUTE pin
Mute function is also performed at MUTE pin (pin15). The logic is as followers:
Pin15
Mute
High
off
Low
on
As it can be seen in Fig. 2, If the voltage of the pin15
become low (below 0.5V) or open, Q3 becomes off and
Q4 on, and hence the bias currents for all channel
drivers are shut down and muted. If the voltage of the
pin15 become high (above 2.0V), the channel drivers
operate normally.
Fig. 2 Mute function
- Thermal shutdown (TSD)
The AD6392 has a thermal protection against the abnormal high temperature operation to protect the chip.
Fig. 3 Thermal shut down
April. 2002 (Rev.0)
Temperature
mute
Above 175 OC
on
Falls below 150 OC
off
Hysteresis
25 OC
Q5 is biased through the resistor string from the
internal bandgap reference voltage so that it
remains in off state at the ranges of the normal
operating temperatures. If the junction temperature rises above 175OC, Q5 turns into on state
and hence Q7 turns on, and all channel drivers
are muted as the bias currents are shut down.
When the junction temperature falls below 150
O
C, Q5 and Q7 are turned off and the drivers
operate normally. The hysteresis temperature is,
thus, 25 OC
www.interpionsemi.com
-7-
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY (Continued)
- CH1,CH2 and CH3 Drive Parts (Focus, Tracking , Sled Drivers)
CH1, CH2 and CH3 drive parts are composed of internal filter, V-I converter and output power amplifiers.
Internal filter
V-I converter
Output Power AMP
Fig. 4 CH1, CH2 and CH3 drive parts
- Internal primary filter
Internal primary filter is composed of sourcing/sinking current source of 22uA and forward/reverse
controlled switches. It converts “FWD/REV” digital signals to analog signal as shown in Fig. 5.
Fig. 5 Output signal waveforms of the primary filter
- V-I converter
V-I converter converts filtered analog voltage signal to positive or negative steering current signals and
delivers them to output power amplifiers.
- Output power amplifier
Output power amplifiers with a unity feedback configuration re-convert the current outputs of V-I
converters to differential output voltage to drive motors in BTL mode.
April. 2002 (Rev.0)
www.interpionsemi.com
-8-
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY (Continued)
Input waveform (digital servo output).
(Pin4,5,9,10,19,20)
Output waveform at internal filter(RCIN).
(Pin3,11,18)
Final output waveform.
(Pin1,2,12,13,26,27)
Fig. 6 Operation waveforms of CH1, CH2 and CH3 drive parts
- Operation principle
If FWD is high and REV is low, then SW_FWD and SW_REV become on and off, respectively.
This causes the internal capacitor to be charged with sourcing current of 22 uA and consequently the
voltage of the filter output (RCIN) increases with the internal time constant of 2.4usec (time constant =
R*C=24 pF * 100 Kohm =2.4usec). Then the output current of V-I converter is given by
di=
VRCIN
100 K
The output voltages of power amplifiers are, then, given as:
DOF = Pref + RCIN
DOR = Pref − RCIN
April. 2002 (Rev.0)
www.interpionsemi.com
-9-
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY (Continued)
- CH4 spindle drive part
CH4 drive part is composed V-I converter and output power amplifiers.
V-I converter
Output Power AMP
Fig. 7 CH4 spindle drive part
- The V-I converter converts the input voltage applied to pin24 into a incremental output current given
by
di =
Vin - Vref
Vin
=
100K
100K
Vin = Vin - Vref
* Vin = input voltage of pin24
*Vref = reference voltage (pin23 or pin25)
- These sourcing and sinking output current from V-I converter are delivered to output power amplifiers,
where they are appeared as differential output voltages given as:
DOF = Pref + di *170K
DOR = Pref − di *170K
- The differential voltage gain is, then, calculated as follows:
Vout = DOF - DOR = 2 * di *170K
Avf = 20log
April. 2002 (Rev.0)
DVout
2 * 170K
= 20log
= 10.6dB
DVin
100K
www.interpionsemi.com
- 10 -
AD6392
4-CH MOTOR DRIVE IC
TEST CIRCUIT
April. 2002 (Rev.0)
www.interpionsemi.com
- 11 -
AD6392
4-CH MOTOR DRIVE IC
TYPICAL APPLICATION CIRCUIT
28
27
26
3
25
4
24
5
23
6
22
7
PGND
REFO PGND
21
20
VCC1 IN3F
8
9
SGND IN2F
AD6392
PGND2 DO4F DO4R VBINA VSIN VBIN VCC2
2
DO1F DO1R RCIN1 IN1R IN1F REFI
1
19
18
17
16
15
IN3R RCIN3 DO3R DO3F MUTE
11
12
13
14
IN2R RCIN2 DO2R DO2F PGND1
10
- 12 -
www.interpionsemi.com
April. 2002 (Rev.0)
AD6392
4-CH MOTOR DRIVE IC
INTERNAL CIRCUIT
Pin no
1,2,
12,13,
16,17,
26,27
3,
11,
18
April. 2002 (Rev.0)
Pin name
Internal circuit
DO1F,
DO1R,
DO2R,
DO2F,
DO3F,
DO3R,
DO4R,
DO4F
RCIN1,
RCIN2,
RCIN3
www.interpionsemi.com
- 13 -
AD6392
4-CH MOTOR DRIVE IC
INTERNAL CIRCUIT (Continued)
Pin no
4,5,
9,10,
19,20
6
April. 2002 (Rev.0)
Pin name
Internal circuit
IN1R,
IN1F,
IN2F,
IN2R,
IN3R,
IN3F
PREFI
www.interpionsemi.com
- 14 -
AD6392
4-CH MOTOR DRIVE IC
INTERNAL CIRCUIT (Continued)
Pin no
Pin name
15
MUTE
Internal circuit
22
23,
24,
25
VBIN,
VSIN,
VBINA
Vcc2
23
15
150k
25
15
24
15
100k
April. 2002 (Rev.0)
www.interpionsemi.com
- 15 -
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS CURVES
Vin vs Vout (CH4)
Vout (V)
6
RL=25 ohm
5
RL=8 ohm
4
RL=4 ohm
3
VCC=8.0V
Vref=2.5V
Vin=sweep
RL=Change
Mute=high
2
1
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Vin (V)
Vin vs Vout (CH1,2,3,)
Vout (V)
6
RL=25 ohm
5
RL=8 ohm
4
RL=4 ohm
3
VCC=8.0V
Vref=2.5V
VRCIN=sweep
RL=Change
Mute=high
2
1
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Vin (V)
April. 2002 (Rev.0)
www.interpionsemi.com
- 16 -
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS CURVES (Continued)
Vcc vs Vout (CH1,2,3,)
Vout (V)
7
6
5
RL=open
4
VCC=Sweep
Vref=2.5V
FWD=Low
REV=High
RL=Change
Mute=high
RL=8 ohm
3
2
1
0
0
2
4
ICC (mA)
6
8
Vcc (V)
10
12
14
16
Vcc vs ICC
10
9
8
7
VCC=Sweep
Vref=2.5V
FWD=open
REV=open
RL=open
Mute=high
6
5
4
4
6
8
10
12
14
16
Vcc (V)
April. 2002 (Rev.0)
www.interpionsemi.com
- 17 -
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS CURVES (Continued)
Imute (mA)
Vcc vs Imute
2.2
2.1
2.0
VCC=Sweep
Vref=2.5V
FWD=open
REV=open
RL=open
Mute=Low
1.9
1.8
1.7
1.6
4
6
8
10
12
14
16
Vcc (V)
Duty vs Vout
Vout (V)
3.0
VCC=8.0V
Vref=2.5V
FWD=Low
REV=pulse
(0V,5V,50kHz)
RL=open
Mute=High
2.5
2.0
1.5
1.0
0.5
0.0
0
10
20
30
40
50
Duty (%)
April. 2002 (Rev.0)
www.interpionsemi.com
- 18 -
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS CURVES (Continued)
Vcc vs Avf
Avf (dB)
12
11
10
9
VCC=8.0V
Vref=2.5V
Vin=0.2Vrms, 1KHz
RL=8 ohm
Mute=High
8
7
6
4
6
8
10
12
14
16
Vcc (V)
Temp vs Icc
Icc (mA)
8
7
6
5
4
VCC=8.0V
Temp=Sweep
Vref=2.5V
RL=8 ohm
Mute=High
3
2
1
0
-40
-20
0
20
40
60
80
100
Temperature
April. 2002 (Rev.0)
www.interpionsemi.com
- 19 -
AD6392
4-CH MOTOR DRIVE IC
ELECTRICAL CHARACTERISTICS CURVES (Continued)
Temp vs Imute
Icc (mA)
3.0
2.5
2.0
1.5
VCC=8.0V
Temp=Sweep
Vref=2.5V
RL=8 ohm
Mute=Low
1.0
0.5
0.0
-40
-20
0
20
40
60
80
100
Temperature
Temp vs Avf
Avf (dB)
12.0
11.5
11.0
10.5
10.0
VCC=8.0V
Temp=Sweep
Vref=2.5V
RL=8 ohm
Mute=High
9.5
9.0
8.5
8.0
-40
-20
0
20
40
60
80
100
Temperature
April. 2002 (Rev.0)
www.interpionsemi.com
- 20 -
AD6392
4-CH MOTOR DRIVE IC
[ 28SSOPH_375A_Type ]
April. 2002 (Rev.0)
www.interpionsemi.com
- 21 -
AD6392
4-CH MOTOR DRIVE IC
PACKAGE DIMENSION
[ 28SSOPH_375B_Type ]
April. 2002 (Rev.0)
www.interpionsemi.com
- 22 -