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參數(shù)資料
| 型號(hào)： | ICE2AS01 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | PWM-FF IC |
| 中文描述： | 脈寬調(diào)制集成電路法郎 |
| 文件頁(yè)數(shù)： | 9/24頁(yè) |
| 文件大小： | 1291K |
| 代理商： | ICE2AS01 |
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Version 2.0 9 1 Feb 2002
ICE2AS01/G
ICE2BS01/G
Functional Description
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
external Power Switch, 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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PDF描述 |
|---|---|
| ICE2AS01G | PWM-FF IC |
| ICE2BS01 | PWM-FF IC |
| ICE2BS01G | PWM-FF IC |
| ICE3A1065L | Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode |
| ICE3B0365L | Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICE2AS01_06 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-Line SMPS Current Mode Controller |
| ICE2AS01G | 功能描述:初級(jí)與次級(jí)側(cè) PWM 控制器 SMPS ICS RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| ICE2AS01GHUMA1 | 制造商:Infineon Technologies AG 功能描述:ELECTRONIC INTEGRATED CIRCUITS - Tape and Reel |
| ICE2AS01GNT | 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller 8-Pin DSO |
| ICE2AS01GXT | 功能描述:初級(jí)與次級(jí)側(cè) PWM 控制器 CTRLR SMP SUPPLIES LOW POWER PFC 27V RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
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