EVALSF2-ICE2A365 Infineon Technologies, EVALSF2-ICE2A365 Datasheet - Page 12

• Manufacturer Part Number: EVALSF2-ICE2A365
• Description: BOARD DEMO ICE2A365 40W SMPS
• Manufacturer: Infineon Technologies
• Series: CoolSET®F2r

Specifications of EVALSF2-ICE2A365

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 40W
• Voltage - Output: 16V
• Current - Output: 2.5A
• Voltage - Input: 85 ~ 270VAC
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: ICE2A365
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Other names: EVALSF2-ICE2A365IN

Figure 11
3.3
Figure 12
The Soft-Start is realized by the internal pull-up resistor
R
Figure 5). The Soft-Start voltage V
charging the external capacitor C
Version 2.6
Soft-Start
Optocoupler
5.6V
5.3V
V
Gate Driver
and the external Capacitor C
SoftS
Soft-Start
PWM Controlling
Soft-Start Phase
FB
R
FB
T
Soft-Start
6.5V
Soft-Start Comparator
PWM OP
PWM Comparator
0.8V
Improved
Current Mode
Soft-Start
x3.65
SoftS
PWM-Latch
is generated by
by the internal
Isense
Soft-Start
(see
t
t
12
pull-up resistor R
compares the voltage at pin SoftS at the negative input
with the ramp signal of the PWM-OP at the positive
input. When Soft-Start voltage V
Feedback voltage V
the pulse width by resetting the PWM-Latch (see
Figure 12). In addition to Start-Up, Soft-Start is also
activated at each restart attempt during Auto Restart.
By means of the above mentioned C
Start can be defined by the user. The Soft-Start is
finished when V
Protection Unit is activated by Comparator C4 and
senses the FB by Comparator C3 wether the voltage is
below 4.8V which means that the voltage on the
secondary side of the SMPS is settled. The internal
Zener Diode at SoftS has a clamp voltage of 5.6V to
prevent the internal circuit from saturation (see Figure
13).
Figure 13
The Start-Up time T
voltage V
Start Phase T
By means of Soft-Start there is an effective
minimization of current and voltage stresses on the
integrated CoolMOS™, the clamp circuit and the output
overshoot and prevents saturation of the transformer
during Start-Up.
C
SoftS
Soft Start
5.6V
FB
6.5V
–
R
5.3V
4.8V
FB
OUT
Activation of Protection Unit
=
6.5V
is settled must be shorter than the Soft-
Soft-Start
------------------------------------ -
R
SoftS
R
Soft Start
C4
C3
Soft-Start
T
Soft-Start
FB
Soft Start
–
Start-Up
(see Figure 14).
exceeds 5.3V. At that time the
the Soft-Start-Comparator limits
Functional Description
–
. The Soft-Start-Comparator
Clock
Power-Up Reset
×
within the converter output
1.69
G2
CoolSET™-F2
PWM-Latch
Error-Latch
SoftS
Soft-Start
R
S
R
S
25 Dec 2006
is less than
Q
Q
Q
Q
the Soft-
Gate
Driver