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ICE3BS03LJG 参数 Datasheet PDF下载

ICE3BS03LJG图片预览
型号: ICE3BS03LJG
PDF下载: 下载PDF文件 查看货源
内容描述: 离线式开关电源电流模式控制器,集成500V启动电池 [Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell]
分类和应用: 电池开关控制器
文件页数/大小: 25 页 / 492 K
品牌: INFINEON [ Infineon ]
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F3 PWM controller  
ICE3BS03LJG  
Functional Description  
3
Functional Description  
All values which are used in the functional description components are necessary to adjust the blanking  
are typical values. For calculating the worst cases the window.  
min/max values which can be found in section 4  
Electrical Characteristics have to be considered.  
In order to increase the robustness and safety of the  
system, the IC provides 2 levels of protection modes:  
Latched Off Mode and Auto Restart Mode. The  
Latched Off Mode is only entered under dangerous  
conditions which can damage the SMPS if not switched  
off immediately. A restart of the system can only be  
done by recycling the AC line. In addition, for this  
enhanced version, there is an external Latch Enable  
function provided to increase the flexibility in protection.  
When the BL pin is pulled down to less than 0.25V, the  
Latch Off Mode is triggered.  
The Auto Restart Mode reduces the average power  
conversion to a minimum under unsafe operating  
conditions. This is necessary for a prolonged fault  
condition which could otherwise lead to a destruction of  
the SMPS over time. Once the malfunction is removed,  
normal operation is automatically retained after the  
next Start Up Phase.  
The internal precise peak current control reduces the  
costs for the transformer and the secondary diode. The  
influence of the change in the input voltage on the  
maximum power limitation can be avoided together  
with the integrated Propagation Delay Compensation.  
Therefore the maximum power is nearly independent  
on the input voltage, which is required for wide range  
SMPS. Thus there is no need for the over-sizing of the  
SMPS, e.g. the transformer and the output diode.  
3.1  
Introduction  
ICE3BS03LJG is an enhanced version of the F3 PWM  
controller (ICE3xS02) for the low to medium power  
application. The particular enhanced features are the  
built-in features for soft start, blanking window and  
frequency jitter. It also provides the flexibility to  
increase the blanking window by simply adding  
capacitor in BL pin. To increase the robustness and  
flexibility of the protection feature, an external latch-off  
enable feature is added. Moreover, the proven  
outstanding features in F3 PWM controller are still  
remained such as the active burst mode, propagation  
delay compensation, modulated gate drive, protection  
for Vcc overvoltage, over temperature, over load, open  
loop, etc.  
The intelligent Active Burst Mode at Standby Mode can  
effective obtain the lowest Standby Power at minimum  
load and no load conditions. After entering this burst  
mode, there is still a full control of the power conversion  
by the secondary side via the same optocoupler that is  
used for the normal PWM control. The response on  
load jumps is optimized. The voltage ripple on Vout is  
minimized. Vout is on well controlled in this mode.  
The usual externally connected RC-filter in the  
feedback line after the optocoupler is integrated in the  
IC to reduce the external part count.  
Furthermore, a high voltage Startup Cell is integrated  
into the IC which is switched off once the Undervoltage  
Lockout on-threshold of 18V is exceeded. The external  
startup resistor is no longer necessary as this Startup  
Cell can directly connected to the input bulk capacitor.  
Power losses are therefore reduced. This increases the  
efficiency under light load conditions drastically.  
Adopting the BiCMOS technology, it can further  
decrease the power consumption and provide a even  
better standby input power. Besides, it also increases  
the design flexibility as the Vcc voltage range is  
extended to 26V.  
Furthermore, this enhanced version implements the  
frequency jitter mode to the switching clock and  
modulated gate drive signal at the Gate pin such that  
the EMI noise will be effectively reduced.  
3.2  
Power Management  
The Undervoltage Lockout monitors the external  
supply voltage VVCC. When the SMPS is plugged to the  
main line, the internal Startup Cell is biased and starts  
to charge the external capacitor CVCC which is  
connected to the VCC pin. This VCC charge current is  
controlled to 0.9mA by the Startup Cell. When the VVCC  
exceeds the on-threshold VCCon=18V, the bias circuit  
The built-in soft start time at 20ms can provide are switched on. Then the Startup Cell is switched off  
sufficient timing to reduce the over-stress at power by the Undervoltage Lockout and therefore no power  
MOSFET and the output rectifier during startup.  
losses present due to the connection of the Startup Cell  
to the Drain voltage. To avoid uncontrolled ringing at  
switch-on a hysteresis start up voltage is implemented.  
The switch-off of the controller can only take place after  
Active Mode was entered and VVCC falls below 10.5V.  
The maximum current consumption before the  
controller is activated is about 250µA.  
There are 2 modes of blanking time for high load  
jumps; the basic mode and the extendable mode. The  
blanking time for the basic mode is set at 20ms while  
the extendable mode will increase the blanking time at  
basic mode by adding external capacitor at the BL pin.  
During this time window the overload detection is  
disabled. With this concept no further external When VVCC falls below the off-threshold VCCoff=10.5V,  
the bias circuit switched off and the soft start counter is  
Version 2.0  
7
6 Dec 2007