TB6598FN/FNG
TENTATIVE
TOSHIBA Bi-CMOS Integrated Circuit
Silicon Monolithic
TB6598FN/FNG
Dual Full-Bridge Driver for Stepping Motors
The TB6598FN/FNG is a 2-phase bipolar stepping motor driver
employing an LDMOS structure with low ON-resistance for
output drive transistors. By applying four input signals (EN1,
EN2, IN1, IN2), it is possible to control the rotation direction
(forward/reverse) of 2-phase/1-2-phase stepper motor.
It is also possible to achieve constant-current drive (PWM
chopper drive).
Features
•
•
•
•
•
•
•
•
Motor supply voltage: V
M
≤
15 V (max)
Control supply voltage: V
CC
= 2.7 V to 6 V
Output current: I
out
≤
0.8 A (max)
Low ON-resistance: 1.5
Ω
(upper side + lower side typ. @ V
M
= 5 V)
Constant-current control (PWM chopper drive)
Standby (power-saving) mode
On-chip thermal shutdown circuit (TSD)
Compact package: SSOP-16
TB6598FNG:
TB6598FNG is a Pb-free product.
The following conditions apply to solderability:
*Solderability
1. Use of Sn-37Pb solder bath
*solder bath temperature = 230°C
*dipping time = 5 seconds
*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
Weight: 0.07 g (typ.)
This product has a MOS structure and is sensitive to electrostatic discharge. When handling the 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.
Install the product correctly. Otherwise, breakdown, damage and/or degradation in the product or
equipment may result.
1
2006-3-6
TB6598FN/FNG
Block Diagram
GND
5
EN1 8
EN2 9
IN1 10
IN2 11
Timing
Logic
Pre-Drive
Control
Logic
3 AO1
H-Bridge
B
1 AO2
2 RFA
12
OSC
TSD
16 BO1
Vlim 7
Timing
Logic
Vref
0.6 V
Band
Gap
Pre-Drive
H-Bridge
B
14 BO2
15 RFB
V
CC
6
13 V
M
OSC
Vref 4
Some functional blocks, circuits, or constants may be omitted or simplified in the block diagram for explanatory
purposes.
Pin Functions
Pin Name
AO2
RFA
AO1
Vref
GND
V
CC
Vlim
EN1
EN2
IN1
IN2
OSC
V
M
BO2
RFB
BO1
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Functional Description
Output 2 (Ch. A)
Winding current detection pin
(Ch. A)
Output 1 (Ch. A)
Internal reference voltage
Ground pin
Small-signal power supply pin
Winding current setting pin
Enable input 1
Enable input 2
Control input 1
Control input 2
Internal oscillation frequency
setting pin
Motor power supply pin
Output 2 (Ch. B)
Winding current detection pin
(Ch. B)
Output 1 (Ch. B)
Ch. B motor winding connection pin
Connect an oscillator capacitor externally
V
M (ope)
=
4.5 V to 13.5 V
Ch. B motor winding connection pin
V
CC (ope)
=
2.7 V to 5.5 V
Icoil (A)
=
Vlimit (V)/external RF (Ω)
Ch. A motor winding connection pin
+0.6
V (typ.)
Remarks
Ch. A motor winding connection pin
2
2006-3-6
TB6598FN/FNG
Truth Table 1
EN1 (EN2)
L
H
L
H
L
Forward
IN1 (IN2)
*
H
AO1 (BO1)
OFF
L
AO2 (BO2)
OFF
H
Mode
ALL OFF
Reverse
“*” indicates “don’t care.”
Truth Table 2
EN1
L
L
H
H
(Note)
EN2
L
H
L
H
Operation
(Note)
Mode
Standby
Note: VINL (EN1
=
EN2)
<
0.5 V.
=
Operating Description
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes.
V
CC
115uA
20 uA
t2
1.2 V
Charge
ON
OSC
40 kΩ
Cosc
Discharge
ON
115 uA
0.8 V
Oscillator circuit
20 kΩ
t1
Vosc
waveform
•
The internal oscillation frequency is determined by charging and discharging an external capacitor (Cosc).
Vosc
=
1
∫
i dt
,
Cosc
∆Vosc =
I× (t1
−
t2)/Cosc,
,
∆
Vosc
½
Cosc
1
I
fosc
=
=
,
2 (t1
−
t2) 2
½∆
Vosc
½
Cosc
1
1
（
theoretical formula
）
.
=
=
2
×
0.4/115
µ
A
×
Cosc
3
6.957
×
10
×
Cosc
1
t1
−
t2
＝
I
3
2006-3-6
TB6598FN/FNG
•
Chopper control
The winding current flows while the output drive transistor is On. When the V
RF
reaches the limit voltage
level (Vlimit), the comparator detects it and turns off the output drive transistor.
The oscillator output is squared to generate an internal clock. The off timer starts on the edge of the
internal clock and is active for two internal clocks. When the off timer stops, the PWM goes high.
osc
Internal clock
Off timer
2-bit counter
PWM output
V limit
Winding current
chop on
*2
*1
*2
*1
*2
*1
*2
*1
*1:
Increase of current
*2:
Chopping of current
The PWM control limits the winding current to a level determined by the current value (I
O
) as expressed in
the equation below:
I
O
=
Vlimt/RNF.
•
PWM control function
When PWM control is provided, normal operation and short brake operation are repeated.
To prevent penetrating current, dead time t2 and t4 are provided in the IC.
VM
M
M
M
RF
<PWM ON>
t1
<PWM ON
→
OFF>
t2
=
400 ns (typ.)
<PWM OFF>
t3
M
M
<PWM OFF
→
ON>
t4
=
400 ns (typ.)
<PWM ON>
t5
4
2006-3-6
TB6598FN/FNG
Absolute Maximum Ratings
(Ta
=
25°C)
Characteristics
Power supply voltage
Symbol
V
M
V
CC
Input voltage
Output current
Power dissipation
Operating temperature
Storage temperature
V
IN
I
OUT
P
D
T
opr
T
stg
Rating
15
6
−0.2
to 6
0.8
0.78 (Note 1)
−20
to 85
−55
to 150
V
A
W
°C
°C
IN1, IN2, EN1 and EN2
pins
Unit
V
Remarks
Note 1: When mounted on a glass-epoxy PCB (50 mm
×
30 mm
×
1.6 mm, Cu area: 40%)
The absolute maximum ratings of a semiconductor device are a set of specified parameter values that must not be
exceeded during operation, even for an instant.
If any of these ratings are exceeded during operation, the electrical characteristics of the device may be
irreparably altered, in which case the reliability and lifetime of the device can no longer be guaranteed.
Moreover, any exceeding of the ratings during operation may cause breakdown, damage and/or degradation in
other equipment. Applications using the device should be designed so that no maximum rating will ever be
exceeded under any operating conditions.
Before using, creating and/or producing designs, refer to and comply with the precautions and conditions set forth
in this document.
Operating Range
(Ta
=
−20
to 85
°C)
Characteristics
Power supply voltage (V
CC
)
Power supply voltage (V
M
)
Output current
Limit voltage
OSC frequency
Chopping frequency
Symbol
V
CC
V
M
I
OUT
V
limit
f osc
f
chop
Min
2.7
2.5
⎯
GND
⎯
20
Typ.
3
5
⎯
⎯
⎯
⎯
Max
5.5
13.5
0.6
Vref
1
250
Unit
V
V
A
V
MHz
kHz
5
2006-3-6
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