參數(shù)資料
型號(hào)： ICE3B0365J
廠商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩
中文描述： 離線式開關(guān)電源電流模式控制器，集成了?650V啟動(dòng)細(xì)胞/消耗的CoolMOS⑩
文件頁數(shù)： 12/26頁
文件大小： 502K
代理商： ICE3B0365J
CoolSET-F3
ICE3Bxx65J
Version 2.3
12
8 May 2006
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 R
via switch S3. The comparator C3 releases the gates
G5 and G6 once V
Softs
has exceeded 4.0V. Therefore
there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor
C
SoftS
. The same procedure happens to the external
Soft Start capacitor if a low load condition is detected
by comparator C5 when V
FB
is falling below 1.35V.
Only after V
SoftS
has exceeded 4.0V and V
FB
is still
below 1.35V Active Burst Mode is entered.
3.6.2
The controller provides Active Burst Mode for low load
conditions at V
OUT
. Active Burst Mode increases
significantly the efficiency at light load conditions while
supporting a low ripple on V
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.
Active Burst Mode
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
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 C
to be charged via S3 starting from the
swinging voltage level between 3.2V and 3.6V in
normal operating mode. If V
SoftS
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 C
SoftS
.
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 C
has to
provide the VCC current (see Figure 15). Furthermore
gate G11 is then released to start the next burst cycle
once V
FB
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 V
OUT
.
Entering Active Burst Mode
3.6.2.2
After entering the Active Burst Mode the FB voltage
rises as V
OUT
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 V
OUT
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).
Working in Active Burst Mode
3.6.2.3
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
Leaving Active Burst Mode
C3
4.0V
C4
4.5V
C6a
3.61V
C5
1.35V
FB
Control Unit
Active
Burst
Mode
3.0V
S1
Internal Bias
R
SoftS
5V
SoftS
&
G10
Current
Limiting
&
G6
C6b
3.0V
&
G11
Frequency
Jitter
S2
S3
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