ICE2AS01 Infineon Technologies, ICE2AS01 Datasheet - Page 11

• 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

recovery time. To avoid a premature termination of the
switching pulse this spike is blanked out with a time
constant of t
the Current-Limit Comparator cannot switch off the
gate drive.
3.5.2
In case of overcurrent detection the shut down of the
external Power Switch is delayed due to the
propagation delay of the circuit. This delay causes an
overshoot of the peak current I
the ratio of dI/dt of the peak current (see Figure 14).
.
Figure 14
The overshoot of Signal2 is bigger than of Signal1 due
to the steeper rising waveform.
A propagation delay compensation is integrated to
bound the overshoot dependent on dI/dt of the rising
primary current. That means the propagation delay
time between exceeding the current sense threshold
V
compensated over temperature within a range of at
least
.
So current limiting is now capable in a very accurate
way (see Figure 16).
E.g. I
delay 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
leads then to an I
propagation delay compensation the overshoot is only
about 2% (see Figure 15).
The propagation delay compensation is done by
means of a dynamic threshold voltage V
15). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
Datasheet
Preliminary Data
0
I
I
I
csth
peak2
peak1
Limit
≤
I
and the switch off of the external Power Switch is
Sense
peak
R
Sense
= 0.5A with R
Propagation Delay Compensation
Current Limiting
LEB
I
×
Overshoot2
= 220ns. During that time the output of
dI
peak
Signal2
dt
peak
overshoot of 14.4%. By means of
Sense
csth
≤
=1V. A current ramp of
= 2. Without propagation
Sense
1
peak
dV
Propagation Delay
Signal1
/dt = 0.8V/µs, and a
dt
which depends on
Sense
t
Propagation Delay
csth
I
(see Figure
Overshoot1
=180ns
t
11
Figure 15
Figure 16
3.6
The oscillator clock output applies a set pulse to the
PWM-Latch when initiating the external Power Switch
conduction. After setting the PWM-Latch can be reset
by the PWM-OP, the Soft-Start-Comparator, the
Current-Limit-Comparator, Comparator C3 or the
Error-Latch of the Protection Unit. In case of reseting
the driver is shut down immediately.
3.7
The driver is a fast totem pole gate drive, which is
designed to avoid cross conduction currents and which
is equipped with a Zener diode Z1 (see Figure 17) in
order to improve the control of the gate attached power
V
V
OSC
csth
1,25
1,15
1,05
0,95
V
1,3
1,2
1,1
0,9
V
1
Sense
0
max. Duty Cycle
0,2
PWM-Latch
Driver
Dynamic Voltage Threshold V
Overcurrent Shutdown
Signal1
0,4
with compensation
0,6
Functional Description
0,8
1
dV
off time
dt
ICE2AS01/S01G
ICE2BS01/S01G
Propagation Delay
Sense
1,2
without compensation
1,4
Signal2
1,6
30 Jun 2006
csth
1,8
2
t
t
V
µ
s