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器件3D模型￥ 10.143
TOP224YN 数据手册 - Power
制造商:
Power
分类:
AC-DC转换器
封装:
TO-220-3
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TOP224YN数据手册
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Rev. F 10/15
3
TOP221-227
www.power.com
TOPSwitch-II Family Functional Description
TOPSwitch is a self biased and protected linear control cur-
rent-to-duty cycle converter with an open drain output. High
efficiency is achieved through the use of CMOS and integra-
tion of the maximum number of functions possible. CMOS
process significantly reduces bias currents as compared to
bipolar or discrete solutions. Integration eliminates external
power resistors used for current sensing and/or supplying
initial start-up bias current.
During normal operation, the duty cycle of the internal output
MOSFET decreases linearly with increasing CONTROL pin
current as shown in Figure 4. To implement all the required
control, bias, and protection functions, the DRAIN and CON-
TROL pins each perform several functions as described
below. Refer to Figure 2 for a block diagram and to Figure 6
for timing and voltage waveforms of the TOPSwitch inte-
grated circuit.
PI-2040-050197
D
MAX
D
MIN
Duty Cycle (%)
I
C
(mA)
2.0 6.0
Slope = PWM Gain
I
B
I
CD1
Auto-restart
Figure 4. Relationship of Duty Cycle to CONTROL Pin Current.
DRAIN
0
V
IN
V
C
0
4.7 V
5.7 V
DRAIN
0
V
IN
V
C
0
4.7 V
5.7 V
C
T
is the total external capacitance
connected to the CONTROL pin
Figure 5. Start-up Waveforms for (a) Normal Operation and (b) Auto-restart.
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