tb62201afg TOSHIBA Semiconductor CORPORATION, tb62201afg Datasheet - Page 67

• Manufacturer Part Number: tb62201afg
• 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 VH potential drops.
(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
V
DD
(1)
27
= 5 V
Comparator
Controller
&
Initial charging
r2
is turned ON, and Ccp1 is charged from Ccp2 via Di2.
Output
H switch
(2)
Output
r1
3/16/21/34
R
is turned ON and T
S
M
Normal state
and V
(3)
t
H
i2
67
T
r2
V
(CcpA pin voltage = charge pump voltage) reaches V
r1
H
R
turned OFF. Ccp2 is charged from Ccp2 via Di1
(4)
V
RS
Di3
T
Z
r2
V
i1 = charge pump current
i2 = gate block power dissipation
H
= V
M
(5)
(1)
Di1
+ V
R
Di2
Output switching
1
1/18/19/36
DD
(2)
= charge pump voltage
(4)
V
(2)
i1
M
12
13
7
CcpB
CcpC
CcpA
V
M
(5)
= 24 V
TB62201AFG
2005-04-04
V
V
H
M
DD
or