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參數(shù)資料
| 型號(hào)： | TPD4008KLBR |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PZFM23 |
| 封裝： | 1.27 MM PITCH, PLASTIC, HZIP-23 |
| 文件頁(yè)數(shù)： | 3/24頁(yè) |
| 文件大?。?/td> | 510K |
| 代理商： | TPD4008KLBR |
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TPD4008K
2001-05-31
11
Description of Bootstrap Capacitor Charging
The IC uses bootstrapping for the power supply for high-side drivers.
The bootstrap capacitor is charged by turning on the low-side IGBT of the same arm (approximately 1/5 of PWM
cycle) while the high-side IGBT controlled by PWM is off.
When the VS voltage exceeds 3.8 V (duty 55%), the low-side IGBT is continuously in the off state. This is because
when the PWM on-duty becomes larger, the arm is short-circuited while the low-side IGBT is on. Even in this state,
because PWM control is being performed on the high-side IGBT, the regenerative current of the diode flows to the
low-side FRD of the same arm, and bootstrap capacitor is charged. Note that when the on-duty is 100%, diode
regenerative current does not flow; thus, the bootstrap capacitor is not charged.
To determine the capacitance of the bootstrap capacitor, take the voltage drop at 100% duty into consideration.
(For example, to drive at 20 kHz, it takes approximately 10 s per cycle to charge the capacitor.)
VS Range
IGBT Operation
A
Both high- and low-side off.
B
Charging range.
Low-side IGBT turns on at the phase when the high-side IGBT turns on in the timing
chart.
C
No charging range.
High-side at PWM; low-side continues on according to the timing chart.
Safe Operating Area
*: The above safe operating area is Tc
= 95°C. If the temperature exceeds this, the safe operation area reduces.
*: The above safe operating area includes the overcurrent protection operation area. If the overcurrent protection
operation continues, depending on the heat discharge conditions, an overheating protection operation may result.
0.9
0
165
P
eak
w
indi
ng
c
u
rrent
(A
)
Power supply voltage
VBB (V)
0
Low-side ON
Duty 80%
C
Triangular wave
Duty 100% (VS: 5.4 V)
High-side duty ON
PWM reference voltage
Duty 55% (VS: 3.8 V)
Duty 0% (VS: 2.1 V)
VVsOFF (VS: 1.3 V)
GND
B
A
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