tb62202afg TOSHIBA Semiconductor CORPORATION, tb62202afg Datasheet - Page 65

• Manufacturer Part Number: tb62202afg
• Description: Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Operation of Charge Pump Circuit
Initial charging
(1) When RESET is released, T
(2) T
(3) When the voltage difference between V
Actual operation
(4) Ccp1 charge is used at fchop switching and the V
(5) Charges up by (1) and (2) above.
(This is the same as when TSD and ISD are operating and the IC is restored from Reset state.)
higher, operation halts (Steady state : Because the capacitor is naturally discharged, the IC is continually
charging to the capacitor).
r1
is turned OFF, T
Comparator
Controller
27
(1)
V
&
Initial charging
DD
r2
= 5 V
is turned ON, and Ccp1 is charged from Ccp2 via Di2.
Output
H switch
r1
Output
(2)
is turned ON and T
3/16/21/34
R
S
M
Normal state
and V
(3)
H
i2
H
t
(CcpA pin voltage = charge pump voltage) reaches V
65
T
r2
V
r1
R
potential drops.
H
(4)
T
RS
turned OFF. Ccp2 is charged from Ccp2 via Di1
V
Di3
r2
Z
1/18/19/36
Di1
(5)
(1)
Di2
R
Output switching
1
V
i1 = charge pump current
i2 = gate block power dissipation
H
= V
(4)
V
(2)
(2)
i1
M
M
12
13
7
V
+ V
M
Ccp A
Ccp B
Ccp C
= 24 V
DD
(5)
= charge pump voltage
TB62202AFG
V
V
H
M
2005-04-04
DD
or