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參數(shù)資料
| 型號(hào)： | ICE2A0165 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 650V/ 800V CoolMOS |
| 中文描述： | 離線式開關(guān)電源電流模式控制器，集成了?650V / 800V的的CoolMOS |
| 文件頁數(shù)： | 13/35頁 |
| 文件大?。?/td> | 1716K |
| 代理商： | ICE2A0165 |
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Version 2.0
13
11 Jun 2004
CoolSET-F2
Functional Description
Figure 14
Start Up Phase
3.4
Oscillator and Frequency
Reduction
3.4.1
Oscillator
The oscillator generates a frequency f
= 67kHz/
100kHz. A resistor, a capacitor and a current source
and current sink which determine the frequency are
integrated. The charging and discharging current of the
implemented
oscillator
capacitor
trimmed, in order to achieve a very accurate switching
frequency. The ratio of controlled charge to discharge
current is adjusted to reach a max. duty cycle limitation
of D
max
=0.72.
are
internally
3.4.2
Frequency Reduction
The frequency of the oscillator is depending on the
voltage at pin FB. The dependence is shown in Figure
15. This feature allows a power supply to operate at
lower frequency at light loads thus lowering the
switching losses while maintaining good cross
regulation performance and low output ripple. In case
of low power the power consumption of the whole
SMPS can now be reduced very effective. The minimal
reachable frequency is limited to 20kHz/21.5 kHz to
avoid audible noise in any case.
Figure 15
Frequency Dependence
3.5
Current Limiting
There is a cycle by cycle current limiting realized by the
Current-Limit Comparator to provide an overcurrent
detection. The source current of the integrated
CoolMOS
TM
is sensed via an external sense resistor
R
Sense
. By means of R
Sense
the source current is
transformed to a sense voltage V
Sense
. When the
voltage V
Sense
exceeds the internal threshold voltage
V
csth
the Current-Limit-Comparator immediately turns
off the gate drive. To prevent the Current Limiting from
distortions caused by leading edge spikes a Leading
Edge Blanking is integrated at the Current Sense.
Furthermore a Propagation Delay Compensation is
added to support the immediate shut down of the
CoolMOS in case of overcurrent.
3.5.1
Leading Edge Blanking
Figure 16
Leading Edge Blanking
Each time when CoolMOS is switched on a leading
spike
is
generated
due
capacitances and secondary-side rectifier reverse
recovery time. To avoid a premature termination of the
switching pulse this spike is blanked out with a time
constant of t
LEB
= 220ns. During that time the output of
to
the
primary-side
t
t
V
SoftS
t
5.3V
4.8V
T
Soft-Start
V
OUT
V
FB
V
OUT
T
Start-Up
67kHz
100kHz
20kHz
21.5kHz
21.5
65
100
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
kHz
V
FB
V
f
O
ICE2Bxxxx
ICE2Axxxx
f
norm
f
standby
t
V
Sense
V
csth
t
LEB
= 220ns
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ICE2A0265 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-Line SMPS Current Mode Controller with integrated 650V/ 800V CoolMOS |
| ICE2A0365 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-Line SMPS Current Mode Controller with integrated 650V/ 800V CoolMOS |
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