ice3ar4780jz Infineon Technologies Corporation, ice3ar4780jz Datasheet - Page 8

• Manufacturer Part Number: ice3ar4780jz
• Description: Off-line Smps Current Mode Controller With Integrated 800v Coolmos And Startup Cell Brownout & Frequency Jitter In Dip- 7
• Manufacturer: Infineon Technologies Corporation

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
(ICE3AR4780JZ) is the enhanced version of the CoolSET
F3R 650V version (ICE3BRxx65J). 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
feature, running at 100KHz switching frequency and packed
in DIP-7 package. It is derived from F3R 650V version. Thus
most of the good features are retained. Besides, it includes
some enhanced features and new features.
The retained good 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 20ms and extended blanking time for short
period of peak power before entering protection, active burst
mode for lowest standby power and propagation delay
compensation for close power limit between high line and
low line, frequency jittering for low EMI performance, the
built-in auto-restart mode protections for open loop, over
load, Vcc OVP, Vcc under voltage, etc. and also the most
flexible external auto-restart enable, etc.
The enhanced features include narrowing the feedback
voltage swing from 0.5V to 0.3V 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 50Ω 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 adjustable brownout for reliable
output performance, selectable entry and exit burst mode so
that smaller entry/exit power to burst mode or even no burst
mode is possible and the propagation delay compensation for
burst mode so that the entry/exit burst mode power is close
between high line and low line.
In summary, the CoolSET
margin of MOSFET, lowest standby power, flexible burst
level, reduced output ripple during burst mode, reliable
output with brownout feature, 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
the low power SMPS application.
Version 2.0
®
®
-F3R80 brownout and jitter 800V version
with start up cell, having adjustable brownout
Functional Description
Introduction
®
F3R80 is a complete solution for
®
F3R80 provides good voltage
®
-
8
3.2
Figure 3
The Undervoltage Lockout monitors the external supply
voltage V
the internal Startup Cell is biased and starts to charge the
external capacitor C
This VCC charge current is controlled to 0.9mA by the
Startup Cell. When the V
V
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
was entered. The maximum current consumption before the
controller is activated is about 200µA.
When V
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 Auto Restart Mode
is entered. The current consumption is then reduced to
320µA.
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.
CCon
Power Management
Drain
=17V the bias circuit are switched on. Then the Startup
Soft Start block
Power-Down Reset
VCC
Internal Bias
VCC
falls below the off-threshold V
Power Management
. When the SMPS is plugged to the main line
VCC
Power Management
falls below 10.5V after normal operation
VCC
which is connected to the VCC pin.
Startup Cell
Functional Description
VCC
Undervoltage Lockout
10.5V
CoolSET
Reference
exceeds the on-threshold
Auto Restart
Active Burst
Voltage
ICE3AR4780JZ
Mode
Mode
CoolMOS
17V
CCoff
26 Aug 2010
VCC
®
®
5.0V
=10.5V, the
-F3R80