tb62209f TOSHIBA Semiconductor CORPORATION, tb62209f Datasheet - Page 32

• Manufacturer Part Number: tb62209f
• Description: Stepping Motor Driver Ic Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

resistor (R
or more) is required.
determined by external capacitor and resistor as a reference.
consumed by the logic block and the charge pump circuit.
•
This IC controls constant current in CLK-IN mode.
At that time, the maximum current value (set current value) can be determined by setting the sensing
1/5.0 is V
For example, when inputting V
At constant current control, this IC chops frequency using the oscillation waveform (saw tooth waveform)
The TB62209F requires an oscillation frequency of eight times the chopping frequency.
The oscillation frequency is calculated as follows:
For example, when C
At this time, the chopping frequency f
When determining the chopping frequency, make the setting taking the above into consideration.
IC power dissipation is classified into two: power consumed by transistors in the output block and power
transistors of the H bridges.
phases A and B is 90°) is determined by expression (1).
V
calculated as follows:
Power consumed by the Power Transistor (calculated with R
M
In Charge mode, Fast Decay mode, or Slow Decay mode, power is consumed by the upper and lower
The following expression expresses the power consumed by the transistors of a H bridge.
The average power dissipation for output under 4-bit micro step operation (phase difference between
Thus, power dissipation for output per unit is determined as follows (2) under the conditions below.
Power consumed by the logic block and IM
The following standard values are used as power dissipation of the logic block and IM at operation.
The logic block is connected to V
Thus, the total power dissipation (P) is
Power dissipation at standby is determined as follows:
For thermal design on the board, evaluate by mounting the IC.
f
I
f
chop
and current consumed by output switching) is connected to V
CR
OUT
P (out) = 2 (T
R
I
V
V
P (out) = 2 (T
I (LOGIC) = 4.0 mA (typ.):
I (I
I (I
P (Logic&IM) = 5 (V) × 0.004 (A) + 24 (V) × 0.015 (A) = 0.38 (W)................. (3)
P = P (out) + P (Logic&IM) = 1.51 (W)
P (standby) + P (out) = 24 (V) × 0.004 (A) + 5 (V) × 0.004 (A) = 0.116 (W)
RS
OUT
=
ON
M
DD
ref
= f
(max)
0.523
M3
M1
) and reference voltage (V
= 24 V
(gain): V
CR
= 5 V
= 0.60 Ω (at 1.0 A)
(Peak: max) = 1.0 A
) = 15.0 mA (typ.): operation/unit
) = 4.0 mA (typ.): stop/unit
/8 = 101
=
×
5.0
(C
1
×
r
r
ref
osc
×
1
) × I
) × 1.0
R
V
kHz
attenuation ratio. (For the specifications, see the electrical characteristics.)
+
ref
= 560 pF and R
OUT
600
2
(V)
(A) × 0.60 (Ω) = 1.20 (W).............................................. (2)
×
(A) × V
C)
ref
×
Torque
= 3 V and torque = 100% to output I
DD
ref
DS
chop
).
(5 V). IM (total of current consumed by the circuits connected to
osc
(Torque
(V) = 2 × I
is calculated as follows:
= 3.6 kΩ are connected, f
R
RS
=
100,
(
OUT 2
Ω
)
85,
× R
70,
ON
50%)
ON
.............................. (1)
= 0.60 Ω)
M
×
CR
100
(24 V). Power dissipation is
OUT
= 813 kHz.
= 0.8 A, R
RS
= 0.75 Ω (0.5 W