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參數(shù)資料
| 型號： | ICE2B265 |
| 英文描述： | ?max. Pout=32W. fop=67kHz. Vbreak=650V. DIP8? |
| 中文描述： | ？最大。噘\u003d 32W。紈褲子弟\u003d 67kHz。 Vbreak \u003d?650V。 DIP8？ |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 1231K |
| 代理商： | ICE2B265 |
Datasheet
Preliminary Data
9
November 2001
CoolSET
-F2
ICE2B165/265/365
Functional Description
Preliminary Specification
Figure 8
PWM Controlling
3.3
Soft-Start
Figure 9
Soft-Start Phase
The Soft-Start is realized by the internal pullup resistor
R
and the external Capacitor C
(see
Figure 2). The Soft-Start voltage V
SoftS
is generated by
charging the external capacitor C
Soft-Start
by the internal
pullup resistor R
Soft-Start
. The Soft-Start-Comparator
compares the voltage at pin SoftS at the negative input
with the ramp signal of the PWM-OP at the positive
input. When Soft-Start voltage V
is less than
Feedback voltage V
the Soft-Start-Comparator limits
the pulse width by reseting the PWM-Latch (see Figure
9). In addition to Start-Up, Soft-Start is also activated at
each restart attempt during Auto Restart. By means of
the above mentioned C
Soft-Start
the Soft-Start can be
defined by the user. The Soft-Start is finished when
V
exceeds 5.3V. At that time the Protection Unit is
activated by Comparator C4 and senses the FB by
Comparator C3 wether the voltage is below 4.8V which
means that the voltage on the secondary side of the
SMPS is settled. The internal Zener Diode at SoftS with
breaktrough voltage of 5.6V is to prevent the internal
circuit from saturation (see Figure 10).
Figure 10
Activation of Protection Unit
The Start-Up time T
Start-Up
within the converter output
voltage V
is settled must be shorter than the Soft-
Start Phase T
Soft-Start
(see Figure 11).
By means of Soft-Start there is an effective
minimization of current and voltage stresses on the
integrated CoolMOS
, the clamp circuit and the output
overshoot and prevents saturation of the transformer
during Start-Up.
x3.65
PWM OP
Improved
Current Mode
PWM Comparator
Isense
Soft-Start Comparator
6.5V
PWM-Latch
0.8V
FB
Optocoupler
R
FB
t
5.3V
V
SoftS
Gate Driver
t
T
Soft-Start
5.6V
6.5V
R
FB
6.5V
Power-Up Reset
C4
5.3V
C3
4.8V
R
Soft-Start
FB
R
S
Q
Q
Error-Latch
R
S
Q
Q
PWM-Latch
G2
Clock
Gate
Driver
5.6V
SoftS
69
,
×
=
Start
Soft
Start
Soft
Start
Soft
R
T
C
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