ICE3DS01L_05 INFINEON [Infineon Technologies AG], ICE3DS01L_05 Datasheet - Page 12

• Manufacturer Part Number: ICE3DS01L_05
• Description: Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
• Manufacturer: INFINEON [Infineon Technologies AG]

within a wide range. Current Limiting is now possible in a
very accurate way (see Figure 13).
E.g. I
Compensation the current sense threshold is set to a static
voltage level V
dI/dt = 0.4A/µs, that means dV
propagation delay time of i.e. t
then to an I
delay compensation the overshoot is only about 2% (see
Figure 13).
Figure 13
The Propagation Delay Compensation is realized by means
of a dynamic threshold voltage V
of a steeper slope the switch off of the driver is earlier to
compensate the delay.
Figure 14
3.6
The Control Unit contains the functions for Active Burst
Mode, Auto Restart Mode and Latched Off Mode. The
Active Burst Mode and the Auto Restart Mode are combined
Version 2.1
V
V
OSC
csth
1,25
1,15
1,05
0,95
peak
V
1,3
1,2
1,1
0,9
V
1
Sense
0
= 0.5A with R
peak
max. Duty Cycle
0,2
Control Unit
overshoot of 14.4%. By means of propagation
Overcurrent Shutdown
Dynamic Voltage Threshold V
csth
Signal1
0,4
=1V. A current ramp of
with compensation
0,6
Sense
0,8
= 2. Without Propagation Delay
dV
1
off time
dt
Propagation Delay
Sense
Propagation Delay
csth
Sense
1,2
without compensation
(see Figure 14). In case
/dt = 0.8V/µs, and a
1,4
Signal2
1,6
csth
=180ns leads
1,8
2
t
t
µ
V
s
12
with an Adjustable Blanking Window which is depending on
the external Soft Start capacitor. By means of this Adjustable
Blanking Window an accidentally entering of the Active
Burst Mode is avoided. Furthermore the overload detection
can be deactivated for a certain time.
3.6.1
Figure 15
V
SMPS is settled. If overload occurs V
Auto Restart Mode can’t be entered as the gate G5 is still
blocked by the comparator C3. But after V
4.8V the switch S1 is opened via the gate G2. The external
Soft Start capacitor can now be charged further by the
integrated pull up resistor R
the gates G5 and G6 once V
Therefore there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor C
same procedure happens to the external Soft Start capacitor
if a low load condition is detected by comparator C6 when
V
SoftS
FB
SoftS
FB
is falling below 1.32V. Only after V
5.4V
4.8V
1.32V
is clamped at 4.4V by the closed switch S1 after the
S1
Adjustable Blanking Window
4.4V
5kΩ
C3
C4
Adjustable Blanking Window
C6
R
G2
SoftS
1
SoftS
Functional Description
. The comparator C3 releases
6.5V
G4
G5
&
&
Softs
ICE3DS01L/LG
FB
has exceeded 5.4V.
is exceeding 4.8V.
SoftS
FB
G6
&
15 Nov 2005
Control Unit
Restart
has exceeded
has exceeded
Active
Mode
Mode
Burst
Auto
SoftS
. The
F3