ICE3BR2065J INFINEON [Infineon Technologies AG], ICE3BR2065J Datasheet - Page 7

• Manufacturer Part Number: ICE3BR2065J
• Manufacturer: INFINEON [Infineon Technologies AG]

3
All values which are used in the functional description
are typical values. For calculating the worst cases the
min/max values which can be found in section 4
Electrical Characteristics have to be considered.
3.1
CoolSET
of the CoolSET
lowest Standby Power at minimum load and no load
conditions. A new fully integrated Standby Power
concept is implemented into the IC in order to keep the
application design easy. Compared to CoolSET
further external parts are needed to achieve the lowest
Standby Power. An intelligent Active Burst Mode is
used for this Standby Mode. After entering this mode
there is still a full control of the power conversion by the
secondary side via the same optocoupler that is used
for the normal PWM control. The response on load
jumps is optimized. The voltage ripple on V
minimized. V
mode.
The usually external connected RC-filter in the
feedback line after the optocoupler is integrated in the
IC to reduce the external part count.
Furthermore a high voltage Startup Cell is integrated
into the IC which is switched off once the Undervoltage
Lockout on-threshold of 18V is exceeded. This Startup
Cell is part of the integrated CoolMOS
startup resistor is no longer necessary as this Startup
Cell is connected to the Drain. Power losses are
therefore reduced. This increases the efficiency under
light load conditions drastically.
The Soft-Start capacitor is also used for providing an
adjustable blanking window for high load jumps. During
this time window the overload detection is disabled.
With this concept no further external components are
necessary to adjust the blanking window.
An Auto Restart Mode is implemented in the IC to
reduce the average power conversion in the event of
malfunction or unsafe operating condition in the SMPS
system.
robustness and safety which would otherwise lead to a
destruction of the SMPS. Once the malfunction is
removed, normal operation is automatically initiated
after the next Start Up Phase.
The internal precise peak current limitation reduces the
costs for the transformer and the secondary diode. The
influence of the change in the input voltage on the
power limitation can be avoided together with the
integrated
Therefore the maximum power is nearly independent
on the input voltage which is required for wide range
SMPS. There is no need for an extra over-sizing of the
SMPS, e.g. the transformer or the secondary diode.
Version 2.6
®
-F3 Jitter version is the further development
This
Functional Description
Introduction
out
Propagation
®
-F2 to meet the requirements for the
is further on well controlled in this
feature
increases
Delay
®
Compensation.
the
. The external
system’s
®
-F2 no
out
is
7
3.2
Figure 3
The Undervoltage Lockout monitors the external
supply voltage V
main line the internal Startup Cell is biased and starts
to charge the external capacitor C
connected to the VCC pin. The VCC charge current
that is provided by the Startup Cell from the Drain pin is
1.05mA. When V
V
Startup Cell is switched off by the Undervoltage
Lockout and therefore no power losses present due to
the connection of the Startup Cell to the Drain voltage.
To avoid uncontrolled ringing at switch-on a hysteresis
is implemented. The switch-off of the controller can
only take place after active mode was entered and
V
The maximum current consumption before the
controller is activated is about 300uA.
Drain
CCon
VCC
Power Management
Power-Down Reset
Internal Bias
falls below 10.3V.
=18V, bias circuit is switched on. Then the
T1
Power Management
Power Management
VCC
. When the SMPS is plugged to the
VCC
Startup Cell
SoftS
exceeds the on-threshold
Reference
Undervoltage Lockout
Voltage
10.3
Auto Restart
CoolSET
Active Burst
Mode
Mode
ICE3Bxx65J
18V
VCC
4 Jul 2011
5V
which is
VCC
®
-F3R