Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

FSDH0265RN Datasheet(PDF) 11 Page - Fairchild Semiconductor

Part # FSDH0265RN
Description  Green Mode Fairchild Power Switch (FPSTM)
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSDH0265RN Datasheet(HTML) 11 Page - Fairchild Semiconductor

Back Button FSDH0265RN Datasheet HTML 7Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 8Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 9Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 10Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 11Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 12Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 13Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 14Page - Fairchild Semiconductor FSDH0265RN Datasheet HTML 15Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 20 page
background image
FSDL0165RN
11
Figure 6. Over load protection
4.2 Thermal Shutdown (TSD) : The Sense FET and the con-
trol IC are integrated, making it easier for the control IC to
detect the temperature of the Sense FET. When the tempera-
ture exceeds approximately 140
°C, thermal shutdown is acti-
vated.
4.3 Abnormal Over Current Protection (AOCP) :
Figure 7. AOCP Function & Block
Even though the FPSTM has OLP (Over Load Protection)
and current mode PWM feedback, these are not enough to
protect the FPSTM when a secondary side diode short or a
transformer pin short occurs. In addition to start-up, soft-
start is also activated at each restart attempt during auto-
restart and when restarting after latch mode is activated. The
FPSTM has an internal AOCP (Abnormal Over Current Pro-
tection) circuit as shown in figure 7. When the gate turn-on
signal is applied to the power Sense FET, the AOCP block is
enabled and monitors the current through the sensing resis-
tor. The voltage across the resistor is then compared with a
preset AOCP level. If the sensing resistor voltage is greater
than the AOCP level, pulse by pulse AOCP is triggered
regardless of uncontrollable LEB time. Here, pulse by pulse
AOCP stops Sense FET within 350nS after it is activated.
4.4 Over Voltage Protection (OVP) : In case of malfunc-
tion in the secondary side feedback circuit, or feedback loop
open caused by a defect of solder, the current through the
opto-coupler transistor becomes almost zero. Then, Vfb
climbs up in a similar manner to the over load situation, forc-
ing the preset maximum current to be supplied to the SMPS
until the over load protection is activated. Because excess
energy is provided to the output, the output voltage may
exceed the rated voltage before the over load protection is
activated, resulting in the breakdown of the devices in the
secondary side. In order to prevent this situation, an over
voltage protection (OVP) circuit is employed. In general,
Vcc is proportional to the output voltage and the FPSTM uses
Vcc instead of directly monitoring the output voltage. If
VCC exceeds 19V, OVP circuit is activated resulting in ter-
mination of the switching operation. In order to avoid undes-
ired activation of OVP during normal operation, Vcc should
be properly designed to be below 19V.
5. Soft Start : The FPSTM has an internal soft start circuit that
increases the feedback voltage together with the Sense FET
current slowly after it starts up. The typical soft start time is
15msec, as shown in figure 8, where progressive increments
of Sense FET current are allowed during the start-up phase.
The pulse width to the power switching device is progres-
sively increased to establish the correct working conditions
for transformers, inductors, and capacitors. The voltage on
the output capacitors is progressively increased with the
intention of smoothly establishing the required output volt-
age. It also helps to prevent transformer saturation and
reduce the stress on the secondary diode.
1
t
2
t
3
t
4
t
t
3V
6V
Vcc
8V
Delay current (5uA) charges the Cfb
Delay current (5uA) charges the Cfb
Delay current (5uA) charges the Cfb
Delay current (5uA) charges the Cfb
FPS switching
FPS switching
FPS switching
FPS switching
OLP
Following Vcc
Following Vcc
Following Vcc
Following Vcc
2
.
_
,
8
.
2
,
3
)
1
(
);
)
1
(
1
(
1
1
fig
fb
fb
fb
C
C
K
R
V
t
V
R
t
V
In
RC
t
=
=
=
=
V
t
V
t
t
V
uA
I
I
t
V
t
t
V
C
t
delay
delay
fb
3
)
1
(
)
2
1
(
,
5
;
))
1
(
)
2
1
(
(
2
=
+
=
+
=
R
SQ
Vsense
Vfb
Out Driver
Rsense
CLK
Drain
V
AOCP
PWM
COMPARATOR
AOCP
COMPARATOR
LEB
1mS
15steps
Current limit
0.98A
2.15A
t
Drain current
[A]


Similar Part No. - FSDH0265RN

ManufacturerPart #DatasheetDescription
logo
Fairchild Semiconductor
FSDH0265RN FAIRCHILD-FSDH0265RN Datasheet
935Kb / 22P
   Green Mode Fairchild Power Switch (FPSTM)
FSDH0265RN FAIRCHILD-FSDH0265RN Datasheet
914Kb / 20P
   Green Mode Fairchild Power Switch (FPS TM)
FSDH0265RN FAIRCHILD-FSDH0265RN Datasheet
938Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSDH0265RN FAIRCHILD-FSDH0265RN Datasheet
938Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSDH0265RN FAIRCHILD-FSDH0265RN Datasheet
510Kb / 20P
   Green Mode Fairchild Power Switch
More results

Similar Description - FSDH0265RN

ManufacturerPart #DatasheetDescription
logo
Fairchild Semiconductor
FSDM101 FAIRCHILD-FSDM101 Datasheet
542Kb / 14P
   Green Mode Fairchild Power Switch (FPSTM)
FSDL0365RN FAIRCHILD-FSDL0365RN_05 Datasheet
938Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSDM0565RBWDTU FAIRCHILD-FSDM0565RBWDTU Datasheet
267Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSDM0565RB FAIRCHILD-FSDM0565RB_06 Datasheet
470Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSDM311 FAIRCHILD-FSDM311 Datasheet
721Kb / 16P
   Green Mode Fairchild Power Switch (FPSTM)
FSDH0170RNB FAIRCHILD-FSDH0170RNB Datasheet
598Kb / 19P
   Green Mode Fairchild Power Switch (FPSTM)
FSDM0365RN FAIRCHILD-FSDM0365RN Datasheet
935Kb / 22P
   Green Mode Fairchild Power Switch (FPSTM)
FSD210 FAIRCHILD-FSD210 Datasheet
391Kb / 18P
   Green Mode Fairchild Power Switch (FPSTM)
FSDH0265RN FAIRCHILD-FSDH0265RN_05 Datasheet
938Kb / 20P
   Green Mode Fairchild Power Switch (FPSTM)
FSES0765RG FAIRCHILD-FSES0765RG Datasheet
249Kb / 18P
   Green Mode Fairchild Power Switch (FPS) for Green Mode Fairchild Power Switch (FPSTM) for
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com