ICE3A2565 Infineon Technologies, ICE3A2565 Datasheet - Page 12

• Manufacturer Part Number: ICE3A2565
• Description: IC OFFLINE CTRLR SMPS CM 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r

Specifications of ICE3A2565

• Package / Case: 8-DIP (0.300", 7.62mm)
• Output Isolation: Isolated
• Frequency Range: 92 ~ 108kHz
• Voltage - Input: 8.5 ~ 22 V
• Voltage - Output: 650V
• Power (watts): 68W
• Operating Temperature: -25°C ~ 130°C
• Output Voltage: 650V
• No. Of Outputs: 1
• Supply Voltage Range: 8.5V To 21V
• Voltage Regulator Case Style: DIP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +150°C
• Termination: RoHS Compliant
• Input Voltage: 265VAC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ICE3A2565X; ICE3A2565XK; SP000015075

Figure 13
3.4
3.4.1
The oscillator generates a frequency f
100kHz. A resistor, a capacitor and a current source
and current sink which determine the frequency are
integrated. The charging and discharging current of the
implemented
trimmed, in order to achieve a very accurate switching
frequency. The ratio of controlled charge to discharge
current is adjusted to reach a max. duty cycle limitation
of D
3.4.2
The frequency of the oscillator is depending on the
voltage at pin FB. The dependence is shown in Figure
14. This feature allows a power supply to operate at
lower frequency at light loads thus lowering the
switching losses while maintaining good cross
regulation performance and low output ripple. In case
of low power the power consumption of the whole
SMPS can now be reduced very effective. The minimal
reachable frequency is limited to 20kHz/21.5 kHz to
avoid audible noise in any case.
Datasheet V4.5
5 .3 V
4 .8 V
V
max
O U T
V
V
=0.72.
V
FB
S oftS
O U T
Oscillator and Frequency
Reduction
Oscillator
Frequency Reduction
Start Up Phase
T
oscillator
T
S ta rt-U p
S o ft-S ta rt
capacitor
are
switch
= 67kHz/
internally
t
t
t
12
Figure 14 Frequency Dependence
3.5
There is a cycle by cycle current limiting realised by the
Current-Limit Comparator to provide an overcurrent
detection. The source current of the integrated
CoolMOS
R
transformed to a sense voltage V
voltage V
V
off the gate drive. To prevent the Current Limiting from
distortions caused by leading edge spikes a Leading
Edge Blanking is integrated at the Current Sense.
Furthermore a Propagation Delay Compensation is
added to support the immedeate shut down of the
CoolMOS™ in case of overcurrent.
3.5.1
Figure 15 Leading Edge Blanking
Each time when CoolMOS™ is switched on a leading
spike
capacitances and secondary-side rectifier reverse
recovery time. To avoid a premature termination of the
switching pulse this spike is blanked out with a time
constant of t
Sense
csth
V
cs th
V
the Current-Limit-Comparator immediately turns
kHz
21.5
100
S en s e
65
. By means of R
is
1.0
f
f
standby
norm
Sense
TM
Current Limiting
Leading Edge Blanking
1.1
generated
LEB
is sensed via an external sense resistor
IC E2Axxxx
21.5kH z
100kHz
1.2
exceeds the internal threshold voltage
= 220ns. During that time the output of
1.3
ICE2Bxxxx
1.4
67kH z
20kH z
Functional Description
t
L E B
due
1.5
Sense
= 2 2 0 n s
1.6
to
the source current is
1.7
CoolSET™-F2
V
1.8
the
FB
Sense
1.9
. When the
primary-side
2.0
Jan 2004
V
t