ICE2AS01 Infineon Technologies, ICE2AS01 Datasheet - Page 9

• Manufacturer Part Number: ICE2AS01
• Description: IC OFFLINE CTRLR SMPS CM 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F2r

Specifications of ICE2AS01

• Output Isolation: Isolated
• Frequency Range: 93 ~ 107kHz
• Voltage - Input: 8.5 ~ 22 V
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ICE2AS01X; ICE2AS01XK; SP000013764

Figure 8
3.3
Figure 9
The Soft-Start is realized by the internal pullup resistor
R
Figure 2). The Soft-Start voltage V
charging the external capacitor C
Datasheet
Preliminary Data
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
9
pullup 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 reseting the PWM-Latch (see Figure
9). In addition to Start-Up, Soft-Start is also activated at
each restart attempt during Auto Restart. By means of
the above mentioned C
defined by the user. The Soft-Start is finished when
V
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 with
breakthrough voltage of 5.6V is to prevent the internal
circuit from saturation (see Figure 10).
Figure 10
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
external Power Switch, the clamp circuit and the output
overshoot and prevents saturation of the transformer
during Start-Up.
C
SoftS
SoftS
5.6V
FB
Soft
6.5V
exceeds 5.3V. At that time the Protection Unit is
−
R
Start
5.3V
4.8V
FB
OUT
Activation of Protection Unit
=
6.5V
is settled must be shorter than the Soft-
Soft-Start
R
R
Soft-Start
C4
C3
Soft
Soft-Start
FB
Start-Up
(see Figure 11).
T
Functional Description
−
the Soft-Start-Comparator limits
Soft
Start
. The Soft-Start-Comparator
Soft-Start
Clock
Power-Up Reset
−
within the converter output
Start
×
ICE2AS01/S01G
ICE2BS01/S01G
G2
, 1
the Soft-Start can be
69
PWM-Latch
Error-Latch
SoftS
R
S
R
S
30 Jun 2006
is less than
Q
Q
Q
Q
Gate
Driver