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ICE3B2065J Schematic ( PDF Datasheet ) - Infineon Technologies

Teilenummer ICE3B2065J
Beschreibung Off-Line SMPS Current Mode Controller
Hersteller Infineon Technologies
Logo Infineon Technologies Logo 




Gesamt 28 Seiten
ICE3B2065J Datasheet, Funktion
Datasheet, Version 2.7, 9 May 2012
CoolSET®-F3R
(Jitter Version)
ICE3B0365J
ICE3B0565J
ICE3B1565J
ICE3B2065J
Off-Line SMPS Current Mode
Controller with integrated 650V
CoolMOS® and Startup cell
(frequency jitter Mode) in DIP-8
Power Management & Supply
Never stop thinking.






ICE3B2065J Datasheet, Funktion
2 Representative Blockdiagram
CoolSET®-F3R
ICE3Bxx65J
Figure 2 Representative Blockdiagram
Version 2.7
6
9 May 2012

6 Page









ICE3B2065J pdf, datenblatt
CoolSET®-F3R
ICE3Bxx65J
exceeded 4.5V the switch S2 is opened and S3 is
closed. The external Soft Start capacitor can now be
charged further by the integrated pull up resistor RSoftS
via switch S3. The comparator C3 releases the gates
G5 and G6 once VSofts has exceeded 4.0V. Therefore
there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor
CSoftS. The same procedure happens to the external
Soft Start capacitor if a low load condition is detected
by comparator C5 when VFB is falling below 1.35V.
Only after VSoftS has exceeded 4.0V and VFB is still
below 1.35V Active Burst Mode is entered.
3.6.2
Active Burst Mode
The controller provides Active Burst Mode for low load
conditions at VOUT. Active Burst Mode increases
significantly the efficiency at light load conditions while
supporting a low ripple on VOUT and fast response on
load jumps. During Active Burst Mode which is
controlled only by the FB signal the IC is always active
and can therefore immediately response on fast
changes at the FB signal. The Startup Cell is kept
switched off to avoid increased power losses for the
self supply.
SoftS
S3
3.0V
S2
S1
4.0V
4.5V
C3
C4
FB
1.35V
C5
RSoftS
Frequency
Jitter
5V
Internal Bias
Current
Limiting
&
G10
Active
Burst
& Mode
G6
3.61V
C6a
3.0V
C6b
&
G11
Control Unit
Figure 14 Active Burst Mode
The Active Burst Mode is located in the Control Unit.
Figure 14 shows the related components.
3.6.2.1 Entering Active Burst Mode
The FB signal is always observed by the comparator
C5 if the voltage level falls below 1.35V. In that case the
switch S1 and S2 is released which allows the
capacitor CSoftS to be charged via S3 starting from the
swinging voltage level between 3.2V and 3.6V in
normal operating mode. If VSoftS exceeds 4.0V the
comparator C3 releases the gate G6 to enter the Active
Burst Mode. The time window that is generated by
combining the FB and SoftS signals with gate G6
avoids a sudden entering of the Active Burst Mode due
to large load jumps. This time window can be adjusted
by the external capacitor CSoftS.
After entering Active Burst Mode a burst flag is set and
the internal bias is switched off in order to reduce the
current consumption of the IC down to approx. 500uA.
Also, switch S1 is closed to clamped the Soft Start
voltage to 3.0V. In this Off State Phase the IC is no
longer self supplied so that therefore CVCC has to
provide the VCC current (see Figure 15). Furthermore
gate G11 is then released to start the next burst cycle
once VFB has 3.0V exceeded.
It has to be ensured by the application that the VCC
remains above the Undervoltage Lockout Level of
10.3V to avoid that the Startup Cell is accidentally
switched on. Otherwise power losses are significantly
increased. The minimum VCC level during Active Burst
Mode is depending on the load conditions and the
application. The lowest VCC level is reached at no load
conditions at VOUT.
3.6.2.2 Working in Active Burst Mode
After entering the Active Burst Mode the FB voltage
rises as VOUT starts to decrease due to the inactive
PWM section. Comparator C6a observes the FB signal
if the voltage level 3.61V is exceeded. In that case the
internal circuit is again activated by the internal Bias to
start with switching. As now in Active Burst Mode the
gate G10 is released the current limit is only 0.32V to
reduce the conduction losses and to avoid audible
noise. If the load at VOUT is still below the starting level
for the Active Burst Mode the FB signal decreases
down to 3.0V. At this level C6b deactivates again the
internal circuit by switching off the internal Bias. The
gate G11 is released as after entering Active Burst
Mode the burst flag is set. If working in Active Burst
Mode the FB voltage is changing like a saw tooth
between 3.0V and 3.61V (see figure 15).
3.6.2.3 Leaving Active Burst Mode
The FB voltage immediately increases if there is a high
load jump. This is observed by comparator C4. As the
current limit is ca. 32% during Active Burst Mode a
certain load jump is needed that FB can exceed 4.5V.
At this time C4 resets the Active Burst Mode which also
Version 2.7 12 9 May 2012

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