參數(shù)資料
型號(hào)： ICE3A1065L
廠商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode
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(dòng)細(xì)胞/消耗的CoolMOS⑩和鎖存關(guān)閉模式
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 525K
代理商： ICE3A1065L
CoolSET-F3
ICE3xxx65L
Functional Description
Version 2.0
10
8 May 2006
3.5
Current Limiting
Figure 9
Current Limiting Block
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
internal 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 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 0.257V. This
voltage level determines the power level when the
Active Burst Mode is left if there is a higher power
demand.
A further comparator C11 is implemented to detect
dangerous current levels which could occur if there is a
short winding in the transformer or the secondary diode
is shorten. To ensure that there is no accidentally
entering of the Latched Mode by the comparator C11 a
spike blanking with 190ns is integrated in the output
path of comparator C11.
3.5.1
Leading Edge Blanking
Figure 10
Leading Edge Blanking
Each time when the 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
internal CoolMOS is delayed due to the propagation
delay of the circuit. This delay causes an overshoot of
the peak current I
which depends on the ratio of dI/
dt of the peak current (see Figure 11).
Propagation Delay Compensation
Figure 11
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
C11
Current Limiting
C10
1.66V
C12
&
0.257V
Leading
Edge
Blanking
220ns
G10
Spike
Blanking
190
ns
Propagation-Delay
Compensation
V
csth
Active Burst
Mode
PWM Latch
FF1
10k
D1
1pF
PWM-OP
CS
Latched Off
Mode
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
相關(guān)PDF資料
PDF描述
ICE3B0365L Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode
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ICE3A2565 Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/CoolMOS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICE3A1065LJ 功能描述:電流型 PWM 控制器 CoolSET F3 650V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
ICE3A1065LJHKLA1 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 650V 1A 8-Pin PDIP 制造商:Infineon Technologies AG 功能描述:IC OFFLINE CTRLR SMPS OTP 8DIP
ICE3A1065LXK 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 8-Pin PDIP
ICE3A1065XK 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 650V 1A 8-Pin PDIP
ICE3A1565 功能描述:電流型 PWM 控制器 Off-Line SMPS Currnt Mode CTRLR 650V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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