TPD4204F

2018-04-09

12

External Parts

Typical external parts are shown in the following table.

Part

Typical

Purpose

Remarks

C1, C2, C3

25 V/2.2 µF

Bootstrap capacitor

(Note 1)

C4

25 V/10 µF

VCC power supply stability

(Note 2)

C5

25 V/0.1 µF

VCC for surge absorber

(Note 2)

C6

25 V/1 µF

VREG power supply stability

(Note 2)

C7

25 V/1000 pF

VREG for surge absorber

(Note 2)

R1

5.1 kΩ

DIAG pull-up resistor

(Note 3)

R2

10 kΩ

SD pull-up resistor

-

R3

0.35 Ω ± 1 % (1 W)

Current detection

(Note 4)

Note 1: The required bootstrap capacitance value varies according to the motor drive conditions. The capacitor is

biased by VCC and must be sufficiently derated for it.

Note 2: When using this product, adjustment is required in accordance with the use environment. When mounting,

place as close to the base of this product leads as possible to improve the ripple and noise elimination.

Note 3: The DIAG pin is open drain. If not using the DIAG pin, connect to the GND.

Note 4: The following formula shows the detection current: IO = VR ÷ R3 (For VR = 0.5 V (typ.))

Handling precautions

(1) Please control the input signal in the state to which the VCC voltage is steady. Both of the order of the VBB

power supply and the VCC power supply are not cared about either.

Note that if the power supply is switched off as described above, this product may be destroyed if the

current regeneration route to the VBB power supply is blocked when the VBB line is disconnected by a relay

or similar while the motor is still running.

(2) The RS pin connecting the current detection resistor is connected to a comparator in the IC and also

functions as a sensor pin for detecting over current. As a result, over voltage caused by a surge voltage, for

example, may destroy the circuit. Accordingly, be careful of handling the IC or of surge voltage in its

application environment.