ICE3RBR0665JG Datasheet, PDF (5/32 Pages) Infineon Technologies AG – Fixed-Frequency, 650V CoolSET™ in DS0-12 Package

Fixed-Frequency, 650V CoolSET™ in DS0-12 Package
Functional Description
3
Functional Description
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
Introduction
ICE3RBR0665JG (ICE3RBRxx65JG series) is the new member of ICE3RBRxx65Jx in DSO-12 package. A high
voltage Startup Cell is integrated into the IC which is switched off once the Undervoltage Lockout on-threshold
of 18 V is exceeded. This Startup Cell is part of the integrated CoolMOS^TM. The external 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 particular features are the active burst mode, propagation delay compensation, modulated gate driving,
auto-restart protection for Vcc overvoltage, over temperature, over load, open loop, built-in soft start, blanking
window and frequency jitter. It provides the flexibility to increase the blanking window by simply addition of a
capacitor in BA pin. In order to further increase the flexibility of the protection feature, an external auto-restart
enable feature is added.
The intelligent Active Burst Mode can effectively obtain the lowest Standby Power at light load and no load
conditions. After entering the burst mode, there is still a full control of the power conversion to the output
through the optocoupler, that is used for the normal PWM control. The response on load jumps is optimized
and the voltage ripple on Vout is minimized. The Vout is on well controlled in this 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.
Adopting the BiCMOS technology, it can increase the design flexibility as the Vcc voltage range is increased to
25 V.
It has a built-in 20 ms soft start function.
There are 2 modes of blanking time for high load jumps; the basic mode and the extendable mode. The
blanking time for the basic mode is set at 20 ms while the extendable mode will increase the blanking time by
adding an external capacitor at the BA pin in addition to the basic mode blanking time. During this blanking
time window the system can give the maximum power to the loading.
In order to increase the robustness and safety of the system, the IC provides Auto Restart protection. The Auto
Restart Mode reduces the average power conversion to a minimum level under unsafe operating conditions.
This is necessary for a prolonged fault condition which could otherwise lead to a destruction of the SMPS over
time. Once the malfunction is removed, normal operation is automatically retained after the next Start Up
Phase. To make the protection more flexible, an external auto-restart enable pin is provided. When the pin is
triggered, the switching pulse at gate will stop and the IC enters the auto-restart mode after the pre-defined
spike blanking time.
The internal precise peak current control reduces the costs for the transformer and the secondary diode. The
influence of the change in the input voltage on the maximum power limitation can be avoided together with
the integrated Propagation Delay Compensation. Therefore the maximum power is nearly independent on the
input voltage, which is required for wide range SMPS. Thus there is no need for the over-sizing of the SMPS, e.g.
the transformer and the output diode.
Furthermore, it implements the frequency jitter mode to the switching clock such that the EMI noise will be
effectively reduced.
Data Sheet
5
Revision 1.0
2016-05-12