參數(shù)資料
型號(hào)： ICE3A1565L
廠(chǎng)商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode
中文描述： 離線(xiàn)式開(kāi)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和鎖存關(guān)閉模式
文件頁(yè)數(shù)： 12/28頁(yè)
文件大小： 525K
代理商： ICE3A1565L
CoolSET-F3
ICE3xxx65L
Functional Description
Version 2.0
12
8 May 2006
C
SoftS
. The same procedure happens to the external
Soft Start capacitor if a low load condition is detected
by comparator C5 when V
is falling below 1.30V.
Only after V
SoftS
has exceeded 5.4V and V
FB
is still
below 1.30V Active Burst Mode is entered.
3.6.2
The controller provides Active Burst Mode for low load
conditions at V
. Active Burst Mode increases
significantly the efficiency at light load conditions while
supporting a low ripple on V
OUT
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 15
Active Burst Mode
The Active Burst Mode is located in the Control Unit.
Figure 15 shows the related components.
3.6.2.1
The FB signal is always observed by the comparator
C5 if the voltage level falls below 1.30V. In that case the
switch S1 is released which allows the capacitor C
SoftS
to be charged starting from the clamped voltage level
at 4.4V in normal operating mode. If V
SoftS
exceeds
5.4V 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. 1.05mA.
In this Off State Phase the IC is no longer self supplied
so that therefore C
VCC
has to provide the VCC current
(see Figure 16). Furthermore gate G11 is then released
to start the next burst cycle once V
FB
has 3.4V
exceeded.
It has to be ensured by the application that the VCC
remains above the Undervoltage Lockout Level of 8.5V
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 4V 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 0.257V 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 3.4V. 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 3.4V and 4V (see Figure 16).
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. 26% during Active Burst Mode a
certain load jump is needed that FB can exceed 4.8V.
At this time C4 resets the Active Burst Mode which also
Leaving Active Burst Mode
C3
5.4V
C4
4.8V
C6a
4.0V
1.30V
FB
Control Unit
Active
Burst
Mode
4.4V
S1
5k
Internal Bias
R
SoftS
6.5V
SoftS
&
G10
Current
Limiting
&
G6
C6b
3.4V
&
G11
C5
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