FA5527 FUJI [Fuji Electric], FA5527 Datasheet - Page 28

• Manufacturer Part Number: FA5527
• Description: Fuji Switching Power Control IC
• Manufacturer: FUJI [Fuji Electric]

(5) When not using an overload protection
(6) Correction of overload detection current
between FB pin and GND.
threshold voltage for overload protection and the IC does
not change to the latch mode even at overload.
available.
current of the MOSFET is limited by the maximum
threshold voltage of the IS pin and power supply voltage
drops. If the state continues as it is, an overload protection
function operates to stop the IC in the latch mode. For
details of an overload protection function, see “9-(8)
Overload protection function.”
current of the power supply varies depending on the input
voltage; and the higher the input voltage is, the larger the
output current.
detection resistor Rs and IS pin, and add a correction
resistor R5 as shown in Fig.35. The typical resistance of
R5 is several hundreds of k ohm to several Meg ohm. Note
that the above correction slightly decreases the value of
overload current limit to stop the IC in the latch mode even
if input voltage is low.
AN-087E Rev.1.0
April-2011
( Line Conversation )
function
As shown in Fig.34, connect a resistor R3 of 18k ohm
As a result, FB pin voltage does not increase to the
In this case, the latch protection for over-voltage is also
If the power supply output becomes overload, the
When the overload protection operates, the output
In such a case, connect R4 between the current
Fuji Electric Co., Ltd.
FA5526/5527/5528/5536/5537/5538
Fig.33 Over Voltage protection (2) for FA5536/37/38
Fig.34 When not using overload protection
28
Fig.35 Correction of overload detection current
( Line Conversation )
http://www.fujielectric.co.jp/products/semiconductor/