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PDF ICE2A265 Data sheet ( Hoja de datos )

Número de pieza ICE2A265
Descripción Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS
Fabricantes Infineon 
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No Preview Available ! ICE2A265 Hoja de datos, Descripción, Manual

Datasheet, Version 3.0, September 2001
CoolSET™-F2
ICE2A165/265/365
ICE2A180/280
Off-Line SMPS Current Mode
Controller with integrated 650V/
800V CoolMOS™
Power Management & Supply
Never stop thinking.

1 page




ICE2A265 pdf
CoolSET-F2
ICE2A165/265/365
ICE2A180/280
Pin Configuration and Functionality
1 Pin Configuration and Functionality
1.1 Pin Configuration
1.2 Pin Functionality
Pin Symbol Function
1 SoftS Soft-Start
2 FB Feedback
3 Isense Controller Current Sense Input,
CoolMOS™ Source Output
4 Drain 650V1)/800V CoolMOS™ Drain
5 Drain 650V2)/800V CoolMOS™ Drain
6 N.C Not connected
7 VCC Controller Supply Voltage
8 GND Controller Ground
1) at Tj = 110°C
2) at Tj = 110°C
Package P-DIP-8-6
SoftS 1
FB 2
Isense 3
Drain
4
8 GND
7 VCC
6 N.C
5 Drain
SoftS (Soft Start & Auto Restart Control)
This pin combines the function of Soft Start in case of
Start Up and Auto Restart Mode and the controlling of
the Auto Restart Mode in case of an error detection.
FB (Feedback)
The information about the regulation is provided by the
FB Pin to the internal Protection Unit and to the internal
PWM-Comparator to control the duty cycle.
Isense (Current Sense)
The Current Sense pin senses the voltage developed
on the series resistor inserted in the source of the
integrated CoolMOS. When Isense reaches the
internal threshold of the Current Limit Comparator, the
Driver output is disabled. By this means the Over
Current Detection is realized.
Furthermore the current information is provided for the
PWM-Comparator to realize the Current Mode.
Drain (Drain of integrated CoolMOS)
Pin Drain is the connection to the Drain of the internal
CoolMOSTM.
VCC (Power supply)
This pin is the positiv supply of the IC. The operating
range is between 8.5V and 21V.
To provide overvoltage protection the driver gets
disabled when the voltage becomes higher than 16.5V
during Start Up Phase.
GND (Ground)
This pin is the ground of the primary side of the SMPS.
Figure 1 Pin Configuration (top view)
Datasheet
5 September 2001

5 Page





ICE2A265 arduino
CoolSET-F2
ICE2A165/265/365
ICE2A180/280
Functional Description
3.5.2 Propagation Delay Compensation
In case of overcurrent detection by ILimit the shut down
of CoolMOSis delayed due to the propagation delay
of the circuit. This delay causes an overshoot of the
peak current Ipeak which depends on the ratio of dI/dt of
the peak current (see Figure 14).
.
ISense
Ipeak2
Ipeak1
ILim it
S ig n a l2
IO vershoot2
S ig n a l1
tPropagation Delay
IO vershoot1
t
Figure 14 Current Limiting
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
Vcsth and the switch off of CoolMOSis compensated
over temperature within a range of at least.
0
R Sense
×
dI peak
dt
1 dV Sense
dt
So current limiting is now capable in a very accurate
way (see Figure 16).
VOSC max. Duty Cycle
The propagation delay compensation is done by
means of a dynamic threshold voltage Vcsth (see Figure
15). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
E.g. Ipeak = 0.5A with RSense = 2 . Without propagation
delay compensation the current sense threshold is set
to a static voltage level Vcsth=1V. A current ramp of
dI/dt = 0.4A/µs, that means dVSense/dt = 0.8V/µs, and a
propagation delay time of i.e. tPropagation Delay =180ns
leads then to a Ipeak overshoot of 12%. By means of
propagation delay compensation the overshoot is only
about 2% (see Figure 16).
V
1,3
1,25
1,2
1,15
1,1
1,05
1
0,95
0,9
0
with compensation
without compensation
0,2 0,4 0,6 0,8
1 1,2 1,4 1,6 1,8
dVSense
dt
2V
µs
Figure 16 Overcurrent Shutdown
3.6 PWM-Latch
The oscillator clock output applies a set pulse to the
PWM-Latch when initiating CoolMOSconduction.
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.
VSense
Vcsth
off time
Propagation Delay t
Signal1
Signal2
Figure 15 Dynamic Voltage Threshold Vcsth
t
3.7 Driver
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 CoolMOSthreshold. This is
achieved by a slope control of the rising edge at the
drivers output (see Figure 17).
Thus the leading switch on spike is minimized. When
CoolMOSis 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 VVCCoff the gate drive is active low.
Datasheet
11 September 2001

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