参数资料
型号: TB62201AF
元件分类: 运动控制电子
英文描述: STEPPER MOTOR CONTROLLER, 1.5 A, PDSO38
封装: 0.450 INCH, 0.65 MM PITCH, HEAT SINK, PLASTIC, SOP-36/38
文件页数: 64/89页
文件大小: 1396K
代理商: TB62201AF
TB62201AF
2005-04-04
67
Operation of Charge Pump Circuit
Initial charging
(1) When RESET is released, Tr1 is turned ON and Tr2 turned OFF. Ccp2 is charged from Ccp2 via Di1
(This is the same as when TSD and ISD are operating and the IC is restored from Reset state.)
(2) Tr1 is turned OFF, Tr2 is turned ON, and Ccp1 is charged from Ccp2 via Di2.
(3) When the voltage difference between VM and VH (CcpA pin voltage = charge pump voltage) reaches VDD or
higher, operation halts (Steady state: Because the capacitor is naturally discharged, the IC is continually
charging to the capacitor).
Actual operation
(4) Ccp1 charge is used at fchop switching and the VH potential drops.
(5) Charges up by (1) and (2) above.
Output switching
Normal state
Initial charging
VH
VM
Charge
p
ump
voltage
t
(2)
(1)
(3)
(4)
(5)
(4)
(5)
1/18/19/36
3/16/21/34
Comparator
&
Controller
Di3
R1
CcpC
Ccp2
=
0.01
F
VZ
Ccp1
=
0.22
F
Tr1
Tr2
i2
VM = 24 V
Output
H switch
Output
Di2
Di1
CcpB
i1
VH
VM
RS
VDD = 5 V
CcpA
(2)
(1)
(2)
VH = VM + VDD = charge pump voltage
i1
= charge pump current
i2
= gate block power dissipation
12
7
13
RRS
27
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