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參數(shù)資料
| 型號： | ICE3B0365J |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ |
| 中文描述： | 離線式開關(guān)電源電流模式控制器，集成了?650V啟動細胞/消耗的CoolMOS⑩ |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 502K |
| 代理商： | ICE3B0365J |
CoolSET-F3
ICE3Bxx65J
Version 2.3
10
8 May 2006
3.5
Current Limiting
Figure 8
Current Limiting
There is a cycle by cycle Current Limiting realized by
the Current-Limit comparator C10 to provide an
overcurrent detection. The source current of the
integrated Depl. CoolMOS 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
which
is fed into the pin CS. If the voltage V
Sense
exceeds the
internal threshold voltage V
csth
the comparator C10
immediately turns off the gate drive by resetting the
PWM Latch FF1. A Propagation Delay Compensation
is added to support the immediate shut down without
delay of the integrated internal CoolMOS in case of
Current Limiting. The influence of the AC input voltage
on the maximum output power can thereby be avoided.
To prevent the Current Limiting from distortions caused
by leading edge spikes a Leading Edge Blanking is
integrated in the current sense path for the
comparators C10, C12 and the PWM-OP.
The output of comparator C12 is activated by the Gate
G10 if Active Burst Mode is entered. Once activated the
current limiting is thereby reduced to 0.32V. This
voltage level determines the power level when the
Active Burst Mode is left if there is a higher power
demand.
3.5.1
Leading Edge Blanking
Figure 9
Leading Edge Blanking
Each time when the integrated internal CoolMOS is
switched on a leading edge spike is generated due to
the primary-side capacitances and secondary-side
rectifier reverse recovery time. This spike can cause
the gate drive to switch off unintentionally. To avoid a
premature termination of the switching pulse, this spike
is blanked out with a time constant of t
LEB
= 220ns.
During this time, the gate drive will not be switched off.
3.5.2
In case of overcurrent detection, the switch-off of the
integrated internal CoolMOS is delayed due to the
propagation delay of the circuit. This delay causes an
overshoot of the peak current I
peak
which depends on
the ratio of dI/dt of the peak current (see Figure 10).
Propagation Delay Compensation
Figure 10
Current Limiting
The overshoot of Signal2 is bigger than of Signal1 due
to the steeper rising waveform. This change in the
slope is depending on the AC input voltage.
Propagation Delay Compensation is integrated to limit
the overshoot dependency on dI/dt of the rising primary
current. That means the propagation delay time
between exceeding the current sense threshold V
and the switch off of the integrated inernal CoolMOS
is compensated over temperature within a wide range.
Current Limiting
C10
C12
&
0.32V
G10
Propagation-Delay
Compensation
V
csth
Active Burst
Mode
PWM Latch
FF1
10k
D1
1pF
PWM-OP
CS
Leading
Edge
Blanking
220ns
t
V
Sense
V
csth
t
LEB
= 220ns
t
I
Sense
I
Limit
t
Propagation Delay
I
Overshoot1
I
peak1
Signal1
Signal2
I
Overshoot2
I
peak2
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| ICE3B0365J_11 | 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 CoolMOS? and Startup cell (frequency jitter Mode) in DIP-8 Product Highlights |
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| ICE3B0365JGXUMA1 | 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 650V 300mA 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 650V 300mA 12-Pin DSO 制造商:Infineon Technologies AG 功能描述:AC/DC COOLSET - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC OFFLINE CTRLR SMPS OTP DSO16 |
| ICE3B0365JTXKLA1 | 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:Off-Line SMPS 650V 300mA 6.45Ohm |
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