STK621-041A-E データシートの表示（PDF） - SANYO -> Panasonic

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STK621-041A-E

Air Conditioner Three-Phase Compressor Motor Driver IMST Inverter Power Hybrid IC

SANYO -> Panasonic 

STK621-041,621-041A-E

(4) VB1, VB2 and VB3 pins

These pins connect the positive power supplies for the upper-side

power device pre-driver circuits. The three control power supplies

each require an electrically insulated floating power supply. In

addition to the method that uses three independent power supplies,

STK621-041,041A-E

this power supply can also be configured using the bootstrap circuit

shown in Fig. 3. As shown in this figure, CB has a path (1) that is

DB

charged when the lower-side device is ON, and a path (2) for motor

regeneration mode. The CB section voltage fluctuates according to the

CB

Driver

switching frequency and duty ratio of the external control circuit.

Therefore, the CB capacitance value must be set in consideration of

the voltage fluctuation. DB should use a high-speed type FRD with a

(1)

(2)

fast trr and VR = 600V. RB is used to limit the rush charging current

during CB initial charging. Note that a large rush charging current VDD

may cause the internal circuits to malfunction. CB can also be charged

Driver

before startup by connecting high-value resistors to the output pins

and minus pins. (Care must be taken for the withstand voltage and the

power.)

The upper-side control power supply voltage is monitored by the

Figure 3 Bootstrap circuit and charge path

under voltage protection circuit, and the respective phase output stops

when the voltage is insufficient.)

(5) Input (HIN1, HIN2, HIN3, LIN1, LIN2, LIN3) pins

Fig. 4 shows the input pin internal circuit. In the input block, the VDD

pin is pulled up internally by a 50kΩ resistor. The input signal is low

active, and output is ON at a voltage of VIH (max) or less, and OFF at

a voltage of VIL (min) or more. This allows direct input to the input

pin from a 5V control circuit. When using direct connection from the

control circuit, the connection block on the control circuit side is

pulled up by a 50kΩ resistor, so the voltage potential may be higher

than 5V. In cases when this voltage may exceed the withstand voltage

of the connection block, an effective measure is to connect an external

resistor of several kΩ between the external 5V power supply and the

input pin. Note that this external resistor also effectively absorbs input

pin noise when the pin is susceptible to noise in an actual set. HIN1,

HIN2 and HIN3 are the inputs for the U, V and W upper-side power

devices, and LIN1, LIN2 and LIN3 are the inputs for the lower-side

power devices. An anti-simultaneous ON circuit is built-in to prevent

arm short-circuits when both the upper and lower inputs for each

phase are ON at the same time. However, a dead time must always be

provided between signals to prevent arm short-circuits due to the

power device switching response delay.

VDD

50kΩ

IN

VSS

Figure 4 Input circuit block

(6) FAULT pin

The FAULT pin is an open drain output as shown in Fig. 5. When

protection operation starts, the MOSFET turns ON and the FAULT

pin goes Low. At this time, the intake current IOSD is 2mA (at

voltage of 1V). This should be taken into account when connecting an

external circuit. When pulling up the pin with a resistor, connect

5.6kΩ or more.

The protection circuits that operate the FAULT pin are the overcurrent

protection circuit and the lower-side drive supply voltage (VDD -

VSS) under-voltage protection circuit. The FAULT pin does not

operate during upper-side power supply under-voltage protection. All

power devices are OFF while the FAULT pin is Low. FAULT is

latched when any of the inputs are ON (except VDUV), and is reset

by turning all six inputs OFF.

VDD

FAULT

VSS

Figure 5 FAULT output block

No. A0483-8/13

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