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參數(shù)資料
| 型號： | TC33025VOETR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 416K |
| 代理商： | TC33025VOETR |
TC33025
8
TC33025-1 5/25/00
High Speed Double Ended Controller
Figure 4. Voltage Mode Operation
Figure 5. Current Mode Operation
In voltage mode operation, the control range on the output of the
Error Amplifier from 0% to 90% duty cycle is from 2.25V to 4.05V.
Output Voltage
Feedback Input
2
1
7
3
5
6
4
1.25V
Oscillator
VREF
CT
From Current
Sense Element
In current mode control, an RC filter should be placed at the ramp input
to filter the leading edge spike caused by turn—on of a power MOSFET.
Output Voltage
Feedback Input
2
1
7
3
5
4
1.25V
Oscillator
VREF
CT
Figure 6. Dead Time Addition
VREF
RDT
RT
CT
4
Oscillator
5
6
Additional dead time can be added by the addition of a dead time resistor
from VREF to CT. See text on oscillator section for more information.
Figure 7. External Clock Synchronization
CT
RT
5.0V
0V
Oscillator
4
5
6
The sync pulse fed into the clock pin must be at least 3.9V. RT and CT need
to be set 10% slower than the sync frequency. This circuit is also used in voltage
mode operation for master/slave operation. The clock signal would be coming
from the master which is set at the desired operating frequency, while the slave
is set 10% slower.
Figure 8. Resistive Current Sensing
ISENSE
9
The addition of an RC filter will eliminate instability caused by the leading edge spike
on the current waveform. This sense signal can also be used at the ramp input pin for
current mode control. For ramp compensation it is necessary to know the gain of the
current feedback loop. If a transformer is used, the gain can be calculated by:
AI =
RSENSE
turns ratio
Figure 9. Primary Side Current Sensing
RW
ISENSE
The addition of an RC filter will eliminate instability caused by the leading
edge spike on the current waveform. This sense signal can also be used
at the ramp input pin for current mode control. For ramp compensation it is
necessary to know the gain of the current feedback loop. The gain can be
calculated by:
9
AI =
RW
turns ratio
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