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參數(shù)資料
| 型號： | TK61220AQ4 |
| 廠商： | TOKO INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, QCC24 |
| 封裝： | 4 X 4 MM, HQFN-24 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大小： | 342K |
| 代理商： | TK61220AQ4 |
TK61220AQ4
GC3-N008B
Page 17
11-5. Undervoltage Lockout (UVLO)
When the supply voltage is under 2.7V the IC turns off
the internal circuitry and prevent any malfunction.
11-6. Thermal Sensor
When the chip temperature exceeds about 150
°C, the
driver output turns Off. Afterwards when the chip
temperature decreases, the driver output turns On again.
11-7. Parallel Synchronization Operation
It is possible to synchronize several TK61220AQ4 by
connecting them together using the CT pin. Set only one
IC as the master and set other ICs as slaves.
The master IC is configured the same as a single
application TK61220AQ4. Then connect the CT pin of
the master IC to the CT pin of the slave IC.
The RT pin of the slave IC is connected to the REF pin.
The
oscillator
frequency
needs
to
be
set
with
consideration of the wiring capacitance of the CT line. It
is necessary to distribute the dimming and the EN signals
to the master IC and all the slave ICs.
Figure.5: Parallel synchronization operation example
REF
RT
10
11
9
CT
10
11
9
10
11
9
REF
RT
CT
Master
Slave 1
Slave 2
11-8. Notes on use
This IC might become an unstable operation below the
lowest operation voltage.
Please use the relation among the supply voltage, the
oscillator frequency, and the load capacitance below the
solid line of Figure 6.
Figure.6: Oscillator Frequency vs. Supply Voltage
0.0
0.5
1.0
1.5
2.0
2.5
0
2
4
6
8
10
12
14
16
Supply Voltage [ V ]
Maximum
Os
cillator
F
requency
[
MHz
]
CL=1000pF
CL=2200pF
CL=560pF
CL=330pF
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