Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ICE3B2065J Datasheet(PDF) 10 Page - Infineon Technologies AG

Part No. ICE3B2065J
Description  Off-Line SMPS Current Mode Controller with integrated 650V CoolMOS® and Startup cell (frequency jitter Mode) in DIP-8 Product Highlights
Download  28 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
Logo 

ICE3B2065J Datasheet(HTML) 10 Page - Infineon Technologies AG

Zoom Inzoom in Zoom Outzoom out
 10 / 28 page
background image
CoolSET®-F3R
ICE3Bxx65J
Version 2.7
10
9 May 2012
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 CoolMOS
® is sensed via an external sense
resistor R
Sense . By means of RSense 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
Propagation Delay Compensation
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).
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
csth
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


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn