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7447462022 数据表(PDF) 5 Page - Infineon Technologies AG

部件名 7447462022
功能描述  12W 5V SMPS evaluation board with ICE3AR4780VJZ
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制造商  INFINEON [Infineon Technologies AG]
网页  http://www.infineon.com
标志 INFINEON - Infineon Technologies AG

7447462022 数据表(HTML) 5 Page - Infineon Technologies AG

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12W 5V SMPS evaluation board with ICE3AR4780VJZ
Circuit description
Application Note
5
Revision 1.2, 2015-05-12
5
Circuit description
5.1
Introduction
The EVAL-3AR4780VJZ evaluation board is a low cost off-line flyback switch mode power supply (SMPS)
using the ICE3AR4780VJZ integrated power IC from the CoolSET™-F3R80 family. The circuit shown in Figure
3, details a 5V, 12W power supply that operates from an AC line input voltage range of 85Vac to 265Vac and
line input OVP detect/reset voltage is 300/282Vac, suitable for applications in enclosed adapter or open
frame auxiliary power supply for different system such as white goods, PC, server, DVD, LED TV, Set-top box,
etc.
5.2
Line input
The AC line input side comprises the input fuse F1 as over-current protection. The choke L11, X-capacitors
C11, C14 and Y-capacitor C12 act as EMI suppressors. Optional spark gap device SG1, SG2 and varistor VAR
can absorb high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk
capacitor C13, a voltage of 90 to 424 VDC is present which depends on input line voltage.
5.3
Line input over voltage protection
The AC line input OVP mode is detected by sensing the voltage level at BV pin through the resistors divider
from the bulk capacitor. Once the voltage level at BV pin hits above 1.98V, the controller stops switching and
enters into input OVP mode. When the BV voltage drops to 1.91V and the Vcc hits 17V, the input OVP mode is
released.
5.4
Start up
Since there is a built-in startup cell in the ICE3AR4780VJZ, no external start up resistor is required. The
startup cell is connecting the drain pin of the IC. Once the voltage is built up at the Drain pin of the
ICE3AR4780VJZ, the startup cell will charge up the Vcc capacitor C16 and C17. When the Vcc voltage exceeds
the UVLO at 17V, the IC starts up. Then the Vcc voltage is bootstrapped by the auxiliary winding to sustain
the operation.
5.5
Operation mode
During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification
D12 and buffering C16, C17. In order not to exceed the maximum voltage at Vcc pin due to poor coupling of
transformer winding, an external zener diode ZD11 and resistor R13 can be added.
5.6
Soft start
The Soft-Start is a built-in function and is set at 10ms.
5.7
RCD clamper circuit
While turns off the CoolMOS™, the clamper circuit R11, C15 and D11 absorbs the current caused by
transformer leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain to source
voltage of CoolMOS™ is lower than maximum break down voltage (V(BR)DSS = 800V) of CoolMOS™.


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