TPD4122K TOSHIBA Semiconductor CORPORATION, TPD4122K Datasheet - Page 10

• Manufacturer Part Number: TPD4122K
• Description: Toshiba Intelligent Power Device High Voltage Monolithic Silicon Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

External Parts
Handling precautions
Typical external parts are shown in the following table.
Note 1: The required bootstrap capacitance value varies according to the motor drive conditions. Although the IC
Note 2: The following formula shows the detection current: I
Note 3: With the combination of C
Note 4: When using the IC, adjustment is required in accordance with the use environment. When mounting, place
Note 5: The FG pin is open drain. If the FG pin is not used, connect to the GND.
Note 6: If noise is detected on the Input signal pin, add a capacitor between inputs.
Note 7: A Hall device should use an indium antimony system.
(1)
(2) The IC has a forward/reverse rotation control pin (FR). To change the rotation direction, switch the FR
(3)
(4)
(5)
C
1
, C
Part
R
C
R
C
C
R
can operate at above the V
greater than or equal to 13.5 V to keep the power dissipation small. The capacitor is biased by V
must be sufficiently derated accordingly.
Do not exceed a detection current of 1 A when using the IC.
intrinsic error factor is around 10 %.
The PWM frequency is broadly expressed by the following formula. (In this case, the stray capacitance of
the printed circuit board needs to be considered.)
f
R
it exceeds the current capacity of the IC internal circuits and the triangular wave distorts. Set R
kΩ.
as close to the base of the IC leads as possible to improve noise elimination.
c
2
1
4
2
5
6
3
A shoot-through current may flow between the upper arm and lower arm in the output stage (IGBT)
An over current may flow into the area where the over current protection circuit cannot detect it.
When switching the power supply to the circuit on/off, ensure that V
off). At that time, either the V
switched off as described above, the IC may be destroyed if the current regeneration route to the V
power supply is blocked when the V
still running.
pin after the motor is stopped in the state that the V
the FR pin is switched while the motor is rotating, the following malfunctions may occur.
at that moment when the motor is switched.
The triangular wave oscillator circuit, with externally connected C
minute amounts of current. Therefore, subjecting the IC to noise when mounting it on the board may
distort the triangular wave or cause malfunction. To avoid this, attach external parts to the base of
the IC leads or isolate them from any tracks or wiring which carries large current.
The PWM of this IC is controlled by the on/off state of the high-side IGBT.
If a motor is locked where V
the load is released as a result of the high side being ON immediately prior to the motor being locked.
This is because, over time, the bootstrap voltage falls, the high-side voltage decrease protection
operates and the high-side output becomes OFF. In this case, since the level shift pulse necessary to
turn the high side ON cannot be generated, reboot is not possible. A level shift pulse is generated by
either the edge of a Hall sensor output or the edge of an internal PWM signal, but neither edge is
available due to the motor lock and duty 100 % command. In order to reboot after a lock, the high-side
2
, C
= 0.65 ÷ { C
creates the reference current of the PWM triangular wave charge/discharge circuit. If R
3
4
× (R
25 V/1000 pF ± 5 %
0.62 Ω ± 1 % (1 W)
2
27 kΩ ± 5 %
25 V/2.2 μF
25 V/0.1 μF
25 V/10 μF
+ 4.25 kΩ)} [Hz]
Typical
5.1 kΩ
4
BS
and R
undervoltage level, it is however recommended that the capacitor voltage be
BB
CC
2
voltage is low and duty is 100 %, it may not be possible to reboot after
shown in the table, the PWM frequency is around 20 kHz. The IC
or the V
BB
Bootstrap capacitor
Current detection
PWM frequency setup
PWM frequency setup
Control power supply stability
V
FG pin pull-up resistor
REG
line is disconnected by a relay or similar while the motor is
BB
10
power supply stability
can be turned on/off first. Note that if the power supply is
Purpose
O
= V
S
R
voltage is lower than or equal to 1.1 V. When
÷ R
1
(V
R
= 0.5 V typ.)
Remarks
(Note 1)
(Note 2)
(Note 3)
(Note 3)
(Note 4)
(Note 4)
(Note 5)
4
and R
S
< VV
2
S
, charges and discharges
OFF (all IGBT outputs
2
TPD4122K
is set too small
2008-08-13
2
to at least 9
CC
and
BB