TB6591FLG
TOSHIBA Bi-CMOS Integrated Circuit Silicon Monolithic
TB6591FLG
DC Motor Driver
The TB6591FLG is a DC motor driver IC using LDMOS output
transistors with low ON-resistance.
The TB6591FLG incorporates one constant-current
PWM-controlled, chopper-type bridge driver, and three
voltage-regulated stepping motor drivers (six bridge drivers) that
support 2-phase and 1-2-phase excitation modes. The TB6591FLG
enables camera motor control for zoom lenses, auto focus and
shutter control.
Features
•
•
•
•
•
•
•
•
•
•
Supply voltage for motor: V
M
≤
6 V (max)
Supply voltage for control block: V
CC
=
2.7 to 6 V
Output current: I
OUT
≤
0.8 A (max)
Weight: 0.1 g (typ.)
Push-pull outputs consisting of P-channel and N-channel LDMOS transistors
Low ON-resistance: R
ON
=
1.5
Ω
(upper and lower sum at V
M
=
5 V, V
CC
=
5 V typ.)
Constant-current driver for PWM chopper control: f
osc
≤
100 kHz
Voltage-regulated driver for direct PWM control: f
pwm
≤
10 kHz (duty cycle
=
10% to 90%)
Standby (power-save) mode
Thermal shutdown (TSD)
Small package: QON48
*:
This product has a MOS structure and is sensitive to electrostatic discharge. When handling this product, ensure
that the environment is protected against electrostatic discharge by using an earth strap, a conductive mat and an
ionizer. Ensure also that the ambient temperature and relative humidity are maintained at reasonable levels.
The TB6591FLG is RoHS-compatible
About solderability, following conditions were confirmed
•
Solderability
(1) Use of Sn-37Pb solder Bath
· solder bath temperature
=
230°C
· dipping time
=
5 seconds
· the number of times
=
once
· use of R-type flux
(2) Use of Sn-3.0Ag-0.5Cu solder Bath
· solder bath temperature
=
245°C
· dipping time
=
5 seconds
· the number of times
=
once
· use of R-type flux
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2008-4-14
TB6591FLG
Absolute Maximum Ratings
(Ta
=
25°C)
Characteristics
Supply voltage for control
Supply voltage for motor
Output voltage
Output current
Input voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
V
M
V
OUT
I
OUT
V
IN
P
D
T
opr
T
stg
Rating
6
6
6
0.8
−0.2
to 6
0.74
−20
to 85
−55
to 150
Unit
V
V
V
A
V
W
°C
°C
IN1, IN2, PWM1-PWM3, STBY
IC only
V
CC
V
M
Remark
Operating Range
(Ta
= −20
to 85°C)
Characteristics
Supply voltage for small signal
circuitry
Supply voltage for motor
Output current
OSC frequency
Direct PWM frequency
(Voltage-regulated H-bridges)
Symbol
V
CC
V
M
I
OUT
f
osc
f
pwm
Min
2.7
2.2
⎯
⎯
⎯
Typ.
3
3.6
⎯
⎯
⎯
Max
5.5
5.5
600
100
100
Unit
V
V
mA
kHz
kHz
Input/Output Function
Input
IN1
H
IN2
H
SB
H
PWM
H
L
H
L
H
H
L
H
L
H
H
L
L
L
H
H
L
H/L
H/L
L
H
L
L
H
L
L
L
L
L
H
OUT1
L
OUT2
L
Output
Mode
Short brake
Reverse/forward
Short brake
Forward/reverse
Short brake
Stop
Standby (power save)
Note: H-SW A to H-SW F only
OFF
(high impedance)
OFF
(high impedance)
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TB6591FLG
Functional Descriptions
Voltage-Regulated Bridges: H-SW A to H-SW F
Direct PWM control
Performing drive control by setting the PWM pins High and Low achieves high thermal efficiency.
In PWM constant-current mode, the PWM chopper circuit alternates between on (t1, t5) and short brake (t3).
(To eliminate shoot-through current, a dead time of 0.5
µs
(typ.) (t2, t4) is inserted when the PWM is turned on
and off.)
The PWM pins should be held High (max
=
V
CC
) when PWM control is not used.
V
M
V
M
V
M
OUT1
M
OUT2
OUT1
M
OUT2
OUT1
M
OUT2
GND
PWM: ON
t1
PWM: ON
→
OFF
t2
=
0.5
µs
(typ.)
V
M
GND
PWM: OFF
t3
V
M
GND
OUT1
M
OUT2
OUT1
M
OUT2
GND
PWM: OFF
→
ON
t4
=
0.5
µs
(typ.)
PWM: ON
t5
GND
V
M
t1
OUT1 voltage waveform
t3
t5
GND
t2
t4
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2008-4-14
TB6591FLG
•
•
Constant-Current Bridge: H-SW G
Oscillator circuitry
*:
The on-chip oscillation is controlled by the charging and discharging of an external capacitor (C
OSC
).
The charging and discharging rate (V
OSC
) of the external capacitor is calculated as follows:
1
∫
i dt
V
OSC
=
C
OSC
Let the time at V
OSC
=
0.5 V be t1 and the time at V
OSC
=
1.2 V be t2, then the V
OSC
slope (∆V
OSC
) is
calculated as:
∆V
OSC
=
I (t1
−
t2)/C
OSC
which can be rewritten as:
I
1
=
t1
−
t2
∆
Vosc
½
Cosc
Hence, the cycle period of the triangular wave oscillation (fOSC) can be expressed as a function of
COSC as follows:
f
OSC
=
1
I
=
2 (t1
−
t2) 2
⋅ ∆
V
OSC
⋅
C
OSC
=
1
1
=
-6
2
×
0.5 / (280
×
10 )
×
C
OSC
3.571
×
10
3
×
C
OSC
280
µA
20
µA
ON (when charging)
Delay
500 ns
40 kΩ
OSC
C
OSC
1.1 V
Oscillator
280
µA
0.6 V
20 kΩ
V
OSC
Waveform
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2008-4-14
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