tb62300fg TOSHIBA Semiconductor CORPORATION, tb62300fg Datasheet - Page 23

• Manufacturer Part Number: tb62300fg
• Description: Dual Full-bridge Driver For Dc Motor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Charge Pump Rise Time
V
M
STANDBY
+ (V
t
ONG
DD
V
DD
× 90%)
: Time taken for capacitor Ccp 2 (charging capacitor) to fill up Ccp 1 (storing capacitor) to V
+ V
after a reset is released.
The internal circuits cannot drive the gates correctly until the voltage of Ccp 1 reaches V
Be sure to wait for t
Basically, the larger the Ccp 1 capacitance is, the smaller the voltage fluctuation is, though the
initial charge up time is longer.
The smaller the Ccp 1 capacitance is, the shorter the initial charge-up time is, but the voltage
fluctuation is larger.
Depending on the combination of capacitors (especially with small capacitance), voltage may not be
sufficiently boosted. When the voltage does not increase sufficiently, R
lower than the reference value, which raises the temperature.
Thus, use the capacitors under the capacitor combination conditions (Ccp 1 = 0.22 µF, Ccp 2 = 0.022
µF) recommended by Toshiba.
5 V
0 V
V
M
M
50%
ONG
or longer before driving the motors.
t
ONG
23
ON
of output DMOS becomes
TB62300FG
Ccp 1 voltage
2005-04-04
M
M
+ V
+ V
DD
DD
.