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參數(shù)資料
| 型號(hào)： | ICE2A280 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS⑩ |
| 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CoolMOS⑩ |
| 文件頁數(shù)： | 10/23頁 |
| 文件大小： | 1496K |
| 代理商： | ICE2A280 |
Datasheet
10
September 2001
CoolSET
-F2
ICE2A165/265/365
ICE2A180/280
Functional Description
Figure 11
Start Up Phase
3.4
Oscillator and Frequency
Reduction
3.4.1
Oscillator
The oscillator generates a frequency f
switch
= 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 are internally 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.
3.4.2
Frequency Reduction
The frequency of the oscillator is depending on the
voltage at pin FB. The dependence is shown in Figure
12. 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 21.5 kHz to avoid
audible noise in any case.
Figure 12
Frequency Dependence
3.5
Current Limiting
There is a cycle by cycle current limiting realised 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
. By means of R
the source current is
transformed to a sense voltage V
. 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 immedeate shut down of the
CoolMOS
in case of overcurrent.
3.5.1
Leading Edge Blanking
Figure 13
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
= 220ns. During that time the output of
the Current-Limit Comparator cannot switch off the
gate drive.
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
0,9
21,5
65
100
1,0
1,1
1,2
1,3
1,4
1,5
V
1,6
1,7
1,8
1,9
2
FB
V
kHz
O
f
t
V
Sense
V
csth
t
LEB
= 220ns
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| ICE2A280ZHKLA1 | 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 800V 2A 7-Pin PDIP 制造商:Infineon Technologies AG 功能描述:AC/DC COOLSET - Rail/Tube 制造商:Infineon Technologies AG 功能描述:IC OFFLINE CTRLR SMPS CM 7DIP |
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