ICE3AR10080CJZ Datasheet, PDF (8/33 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 800V CoolMOS® and Startup cell (brownout & CCM) in DIP-7

CoolSET^®-F3R80
ICE3AR10080CJZ
Functional Description
3
Functional Description ^{3.2 Power Management}
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.
Drain
Startup Cell
VCC
3.1
Introduction
CoolMOS^®
ICE3ARxx80CJZ brownout and CCM 800V version is
an enhanced version of the CoolSET^®-F3R80. The
major new and enhanced features include slope
compensation for CCM operation, fast AC reset after
latch enabled, fixed voltage brownout detect and
voltage detect for the burst selection. It is particular
good for high voltage margin low power SMPS
application such as auxiliary power supply for PC and
server. The major characteristics are that the IC is
developed with 800V CoolMOS^® with start up cell,
having adjustable brownout feature, running at 100KHz
switching frequency, CCM operation and packed in
DIP-7 package.
The features include BiCMOS technology to reduce
power consumption and increase the Vcc voltage
range, cycle by cycle current mode control, built-in
10ms soft start to reduce the stress of switching
elements during start up, built-in 40ms for short period
of peak power before entering protection, active burst
mode for lowest standby power, propagation delay
compensation for close power limit between high line
and low line which also takes into consideration of
slope compensation, frequency jittering for low EMI
performance, the built-in auto-restart mode protections
for open loop, over load, Vcc OVP, Vcc under voltage,
and latch enable feature etc.
The other features include narrowing the feedback
voltage swing to 0.3V (from 0.5V) during burst mode so
that the output voltage ripple can be reduced by 40%,
reduction of the fast voltage fall time of the MOSFET by
increasing the soft turn-on time and addition of 50W
turn-on resistor, faster start up time by optimizing the
Vcc capacitor to 10uF and over temperature protection
with 50°C hysteresis.
The new features include slope compensation for
stable operation in CCM mode when duty is larger than
0.5, fixed voltage triggering for the bronwout feature for
easier design, voltage levels select for entry/exit burst
level, fast AC reset fto reset the latch feature, etc.
In summary, the CoolSET^® ICE3ARxx80CJZ provides
good voltage margin of MOSFET, lowest standby
power, flexible burst level, CCM operation, reduced
output ripple during burst mode, accurate power limit
for both maximum power and burst power, low EMI with
frequency jittering and soft gate drive, built-in and
flexible protections, etc. Therefore, CoolSET^®
ICE3ARxx80CJZ is a complete solution for the low
power SMPS application.
Power Management
Internal Bias
Latched Off Mode
Reset; VVCC < 8V or
AC fast reset is
triggered
Power-Down Reset
Soft Start block
Undervoltage Lockout
17V
10.5V
Voltage
Reference
5.0V
Auto Restart
Mode
Active Burst
Mode
Latched Off
Mode
Figure 3 Power Management
The Undervoltage Lockout monitors the external
supply voltage V_VCC. When the SMPS is plugged to the
main line the internal Startup Cell is biased and starts
to charge the external capacitor C_VCC which is
connected to the VCC pin. This VCC charge current is
controlled to 1.0mA by the Startup Cell. When the V_VCC
exceeds the on-threshold V_CCon=17V the bias circuit
are switched on. Then the 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 start up voltage is implemented.
The switch-off of the controller can only take place
when V_VCC falls below 10.5V after normal operation
was entered. The maximum current consumption
before the controller is activated is about 210mA.
When V_VCC falls below the off-threshold V_CCoff=10.5V,
the bias circuit is switched off and the soft start counter
is reset. Thus it ensures that at every startup cycle the
soft start starts at zero.
The internal bias circuit is switched off if Latched Off
Mode or Auto Restart Mode is entered. The current
consumption is then reduced to 420mA.
Once the malfunction condition is removed, this block
will then turn back on. The recovery from Auto Restart
Mode does not require re-cycling the AC line. In case
Latched Off Mode is entered, VCC needs to be lowered
below 8V or having AC fast reset triggered to reset the
Version 2.0
8
11 Jan 2012