參數(shù)資料
型號(hào)： ICE3AS02
廠商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
中文描述： 離線式開(kāi)關(guān)電源電流模式控制器，集成了500V啟動(dòng)單元
文件頁(yè)數(shù)： 10/23頁(yè)
文件大?。?/td> 476K
代理商： ICE3AS02
F3
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
Functional Description
Version 1.1
10
21 May 2004
3.4
PWM Section
Figure 7
PWM Section
3.4.1
The oscillator generates a fixed frequency. The
switching frequency for ICE3AS02/G is f
= 100kHz
and for ICE3BS02/G f
= 67kHz. A resistor, a
capacitor and a current source and current sink which
determine the frequency are integrated. The charging
and discharging current of the implemented oscillator
capacitor are internally trimmed, in order to achieve a
very accurate switching frequency. The ratio of
controlled charge to discharge current is adjusted to
reach a maximum duty cycle limitation of D
max
=0.72.
Oscillator
3.4.2
The oscillator clock output provides a set pulse to the
PWM-Latch when initiating the external Power Switch
conduction. After setting the PWM-Latch can be reset
by the PWM comparator, the Soft Start comparator or
the Current-Limit comparator. In case of resetting, the
driver is shut down immediately.
PWM-Latch FF1
3.4.3
The Gate Driver is a fast totem pole gate drive which is
designed to avoid cross conduction currents and which
is equipped with a zener diode Z1 (see Figure 8) in
order to improve the control of the Gate attached power
transistors as well as to protect them against
undesirable gate overvoltages.
Gate Driver
The Gate Driver is active low at voltages below the
undervoltage lockout threshold V
VCCoff
.
Figure 8
Gate Driver
The driver-stage is optimized to minimize EMI and to
provide high circuit efficiency. This is done by reducing
the switch on slope when exceeding the external
Power Switch threshold. This is achieved by a slope
control of the rising edge at the driver’s output (see
Figure 9).
Figure 9
Gate Rising Slope
Thus the leading switch on spike is minimized. When
the external Power Switch is switched off, the falling
shape of the driver is slowed down when reaching 2V
to prevent an overshoot below ground. Furthermore the
driver circuit is designed to eliminate cross conduction
of the output stage. During powerup when VCC is
below the undervoltage lockout threshold V
, the
output of the Gate Driver is low to disable power
transfer to the seconding side.
Oscillator
Duty
Cycle
max
Gate
Driver
0.72
Clock
&
G9
1
G8
PWM Section
FF1
R
S
Q
Gate
Soft Start
Comparator
PWM
Comparator
Current
Limiting
Z1
VCC
1
PWM-Latch
Gate
t
V
Gate
5V
C
Load
= 1nF
ca. t = 130ns
相關(guān)PDF資料
PDF描述
ICE3AS02G Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3BS02 Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3BS02G Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3BS02L Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell and Latched off Mode
ICL3207 Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers(低功耗RS-232收發(fā)器（5發(fā)3收）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICE3AS02_05 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3AS02G 功能描述:電流型 PWM 控制器 OFF-LINE SMPS CRRNT MODE CONTROLLER RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
ICE3AS02GXT 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller -0.3V to 22V 700mA 8-Pin DSO
ICE3AS02XK 制造商:Infineon Technologies AG 功能描述:Current Mode PWM Controller -0.3V to 22V 700mA 8-Pin PDIP
ICE3AS03LJG 功能描述:電流型 PWM 控制器 Off-Line SMPS Curr Cntlr w/integrt 500V RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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