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PDF KA3505 Data sheet ( Hoja de datos )
| Número de pieza | KA3505 | |
| Descripción | PC SMPS Supervisory IC | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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KA3505
PC SMPS Supervisory IC
www.fairchildsemi.com
Features
• PC Power Supply Output Monitor Circuitry
• Few External Components
• Over Voltage Protection for 3.3V/5V/12V Output
• Under Voltage Protection for 3.3V/5V/12V Output With
Delay Time
• Over Current Protection for 3.3V/5V/12V Output With
Delay Time
• Fault Protection Output With Open Collector Output
• Power Supply on/off Delay Time Control (PSON)
• Power Good Signal Generator With Hysteresis
• Open Collector PG Output
• 300ms Power Good Delay
• Current Sense Setting Function With RI
• Latch Function Controlled by PSON and Protection Input
• 16-Pin Dual In-line Package
FPO (Fault Protection Output)
Fault Protection Output indicates the fault condition as
protection signal. When fault state occurs, the main power is
to be turned-off and the PGO signal goes LOW.
NORMAL = "LOW", FAULT = "HIGH"
PGO (Power Good Output)
Power Good Signal Generator is to monitor the voltage level
of power supply for safe operation of a microprocessor
having some delay time at turn-on. The delay time is
programmed by a timing capacitor connected to TPG pin of
KA3505. The power good output should be low state before
the output voltage is out of regulation at turn-off.
NORMAL = "HIGH", FAULT = "LOW"
Description
The KA3505 is complete output supervisory circuitry
intended for use in the secondary side of the switched mode
power supply. It provides all the functions necessary to
monitor and control the output of the power supply system.
Power good signal generator, Remote on and off control,
some precision protection features against over-voltage,
under-voltage and over-current are implemented. It directly
senses all the output rails for OVP and UVP without any
external dividers. As for output control, Power Good Output
(PGO) and Fault Protection Output (FPO) are also included.
Utilizing a minimum number of external components, the
KA3505 offers a simple and cost effective solution, greatly
reducing PCB board space for power supply system.
OCP (Over Current Protection)
It has precision OCP functions for +3.3V, +5V, +12V
outputs. The block is made up of three comparators with
current source setting function. Two inputs of each OCP
comparator are connected to both sides of output inductor that
is located in the secondary output of SMPS.
OVP (Over Voltage Protection)
It has OVP functions for +3.3V, +5V, +12V outputs. The
circuit is made up of a comparator with three detecting inputs.
UVP (Under Voltage Protection)
It also has UVP functions for +3.3V, +5V, +12V outputs. The
block is made up of a comparator with three detecting inputs.
Remote ON/OFF
Remote on/off section is used to control SMPS externally.
If a high signal is supplied to the remote on/off input, FPO
signal becomes a high state and all secondary outputs are
grounded. The remote on/off signal is transferred with some
on-delay and off-delay time of 8ms, 24ms respectively with
0.1µF external capacitor.
16-DIP
1
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1
1 page  
KA3505
Electrical Characteristics
(VCC = 20V, -25°C < Ta < 85°C, unless otherwise specified)
Characteristic
Symbol
PROTECTION SECTION
Over Voltage Protection for 3.3V
VOVP33
Over Voltage Protection for 5V
VOVP5
Over Voltage Protection for 12V
VOVP12
Under Voltage Protection for 3.3V
VUVP33
Under Voltage Protection for 5V
VUVP5
Under Voltage Protection for 12V
VUVP12
Offset Voltage of OCP Comparator
Voffset
Charging Current for OCP, UVP Delay ICHG(PROT)
3.3, 5, 12V Over Current Delay Time
TD(OCP)
3.3, 5, 12V Under Voltage Delay Time TD(UVP)
POWER SUPPLU ON/OFF SECTION (PSON) Note
PSON Input Threshold Voltage
VTH(PSON)
PSON Open Voltage
VOPEN(PSON)
PSON Input Low Current
ILOW(PSON)
ON Delay Time
TON(PSON)
OFF Delay Time
TOFF(PSON)
FPO SECTION
FPO Saturation Voltage
VSAT(FPO)
FPO Leakage Current
VLKG(FPO)
Test Conditions
VPSON = 0V
VPSON = 0V
VPSON = 0V
VPSON = 0V
VPSON = 0V
VPSON = 0V
VPSON = 0V
-
C = 0.47µF
C = 0.47µF
PSON: "H" → "L"
PSON: Open
VPSON = 0V
C = 0.1µF
C = 0.1µF
IFPO = 10mA
VFPO = 20V
Min.
3.9
5.7
13.6
2.69
4.1
9.8
-3
-15
24
24
1
4
-
4
16
-
-
Typ. Max. Unit
4.1 4.3
V
6.1 6.5
V
14.3 15.0
V
2.83 2.97
V
4.3 4.5
V
10.3 10.8
V
- 3 mV
-21 -30
µA
38 57 msec
38 57 msec
1.4 1.8
V
- 5.25 V
- -1.6 mA
8 14 msec
24 34 msec
0.2 0.4
0.01 1
V
µA
Electrical Characteristics (Continued)
(VCC = 20V, -25°C < Ta < 85°C, unless otherwise specified)
Characteristic
POWER GOOD SECTION
PG Input Threshold Voltage
Hysteresis Voltage 1
Hysteresis Voltage 2
Charging Current for PG Delay
PG Delay Time
PG Output Saturation Voltage
TOTAL DEVICE
Stand-by Supply Current
Symbol
Test Conditions Min. Typ. Max. Unit
VIN(PG1)
HY1
HY2
ICHG(PG)
TD(PG)
VSAT(PG)
PG: "H"→"L"
COMP7
COMP4, 6, 8
-
C = 2.2µF
IPG = 10mA
1.20 1.25 1.30
V
10 40 80 mV
0.6 1.2
-
V
-9 -14 -22 µA
150 270 450 msec
- 0.2 0.4 V
ICC - - 5 10 mA
Note:
1. It does TTL operation and its threshold voltage is 1.4V.
2. Power Supply ON Delay Time (Ton) is measured as PSON input goes "Low" to "High".
3. Power Supply OFF Delay Time (Toff) is measured as PSON input goes "High" to "Low".
5
5 Page 
Current Mode Application Schematic
D1
AC Input
FUSE
-+
C1
220uF
M1
R1
0.27Ω
D3
D5
L1
D2
L2
D4
L3
D6
KA38XX C15 R12
+5Vsb
C14
10nF
R13
10ΚΩ
R14
10ΚΩ
D7
R15
330Ω
TL431
R10
R11
Q1
+5Vsb
REMOTE ON/OFF
POWER GOOD
KA3505
L4
C2
1000uF
C5
1uF
R2
C8
1000uF
L5
C3
1000uF
C6
1uF
R3
R5
C9
1000uF
L6
C4
1000uF
C7
1uF
R4
C10 R6
1000uF
R7
Vcc
R8
R15
C11
0.1uF
R16
KA3505
C12
2.2uF
R9 C13
62ΚΩ
0.47uF
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet KA3505.PDF ] | |
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