tb62300fg TOSHIBA Semiconductor CORPORATION, tb62300fg Datasheet - Page 22
tb62300fg
Manufacturer Part Number
tb62300fg
Description
Dual Full-bridge Driver For Dc Motor
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TB62300FG.pdf
(28 pages)
- Current page: 22 of 28
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Operation of Charge Pump Circuit
• Initial charging
• Actual operation
(1)
(2)
(3)
(4)
(5)
When RESET is released, T
After T
When the voltage difference between V
reaches V
The charge of Ccp 1 charge is used at f
The circuit is charged up by the operations of (1) and (2) above.
Comparator
Controller
r1
and
(1)
V
Initial charging
DD
is turned off and T
DD
= 5 V
or higher, operation halts (in the steady-state phase).
Output
H switch
(2)
Output
R
S
Steady-state phase
r1
r2
is turned on and T
is turned on, and Ccp 1 is charged from Ccp 2 via Di2.
(3)
chop
M
t
22
i2
T
V
r1
R
and V
(4)
H
T
RS
Di3
switching and the potential of V
r2
V
z
H
r2
(Ccp A pin voltage = charge pump voltage)
Di1
(5)
(1)
Di2
V
i1 = charge pump current
i2 = gate block power dissipation
R
turned off. Ccp 2 is charged from V
Output switching
H
1
= V
(2)
(4)
M
(2)
V
i1
M
+ V
7
Ccp C
Ccp A
Ccp B
V
DD
M
Ccp 2
0.022 µ F
= 24 V
= charge pump voltage
(5)
Ccp 1
0.22 µ F
H
drops.
TB62300FG
V
V
M
H
2005-04-04
M
via Di1.
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