ICE2A280ZXK Infineon Technologies, ICE2A280ZXK Datasheet - Page 14

• Manufacturer Part Number: ICE2A280ZXK
• Manufacturer: Infineon Technologies

Specifications of ICE2A280ZXK

• Number Of Pwm Outputs: 1
• On/off Pin: No
• Adjustable Output: No
• Topology: Flyback
• Switching Freq: 107KHz
• Duty Cycle: 77%
• Operating Supply Voltage (max): 21V
• Output Current: 2000A
• Output Voltage: 800V
• Synchronous Pin: No
• Rise Time: 30ns
• Fall Time: 30ns
• Operating Temperature Classification: Automotive
• Mounting: Through Hole
• Pin Count: 7
• Package Type: PDIP
• Lead Free Status / Rohs Status: Compliant

0
the Current-Limit Comparator cannot switch off the
gate drive.
3.5.2
In case of overcurrent detection by I
of CoolMOS™ is delayed due to the propagation delay
of the circuit. This delay causes an overshoot of the
peak current I
the peak current (see Figure 17).
.
Figure 17
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
over temperature within a range of at least.
Figure 18
Version 2.6
I
I
I
csth
peak2
peak1
Limit
≤
V
V
I
and the switch off of CoolMOS™ is compensated
R
V
Sense
Sense
OSC
csth
Sense
Propagation Delay Compensation
×
Current Limiting
Dynamic Voltage Threshold V
max. Duty Cycle
dI
----------- -
peak
I
Overshoot2
dt
peak
Signal1
which depends on the ratio of dI/dt of
Signal1
≤
dV
---------------
dt
Sense
Signal2
off time
Signal2
Limit
t
Propagation Delay
Propagation Delay
the shut down
csth
I
Overshoot1
t
t
t
14
The propagation delay compensation is done by
means of a dynamic threshold voltage V
18). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
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 a I
propagation delay compensation the overshoot is only
about 2% (see Figure 19).
Figure 19
3.6
The oscillator clock output applies a set pulse to the
PWM-Latch when initiating CoolMOS™ 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 resetting the driver is shut
down immediately.
3.7
The driver-stage drives the gate of the CoolMOS™ and
is optimized to minimize EMI and to provide high circuit
efficiency. This is done by reducing the switch on slope
when reaching the CoolMOS™ threshold. This is
achieved by a slope control of the rising edge at the
driver’s output (see Figure 20) to the CoolMOS™ gate.
Thus the leading switch on spike is minimized. When
CoolMOS™ is switched off, the falling shape of the
driver is slowed down when reaching 2V to prevent an
overshoot below ground. Furthermore the driver circuit
is designed to eliminate cross conduction of the output
stage. At voltages below the undervoltage lockout
threshold V
1.25
1.15
1.05
0.95
peak
1.3
1.2
1.1
0.9
V
1
0
= 0.5A with R
PWM-Latch
Driver
0.2
VCCoff
Overcurrent Shutdown
0.4
peak
the gate drive is active low.
0.6
with compensation
overshoot of 14.4%. By means of
Functional Description
0.8
Sense
csth
1
dV
=1V. A current ramp of
= 2. Without propagation
dt
Sense
Sense
1.2
without compensation
CoolSET™-F2
Propagation Delay
1.4
/dt = 0.8V/µs, and a
1.6
csth
25 Dec 2006
1.8
(see Figure
2
=180ns
V/us