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PDF FA5514P Data sheet ( Hoja de datos )
| Número de pieza | FA5514P | |
| Descripción | CMOS IC For Switching Power Supply Control | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FA5514P (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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FA551X series
CMOS IC
For Switching Power SupplyFCAo5n5tr1oXl
FA5510P (N), FA5511P (N)
FA5514P (N), FA5515P (N)
■ Description
The FA551X series are the PWM type switching power supply
control ICs that can directly drive power MOSFET. These ICs
use a CMOS device with high dielectric strength (30V) to
implement low power consumption. These ICs contain many
function in a small 8-pin package. With these ICs, a high-
performance and compact power supply can be created
because not many external discrete components are needed.
■ Features
• Low current consumption by CMOS process with high
dielectric strength (30V)
• Standby current of 2µA or less (at Vcc=14V), and operating
current of 1.5mA (typ)
• Overvoltage protection function detecting the Vcc voltage
• A drive circuit for connecting a power MOSFET directly
• Output peak current: ±1.5A
• Pulse-by-pulse overcurrent limiting function
• Overload protection function (latch or non-latch mode selectable)
• Output ON-OFF function by external signal
• Latch-mode overvoltage shutdown function
• Undervoltage lockout function (16.5V ON / 9V OFF)
• Reference voltage output (5V)
• 8-pin package (DIP/SOP)
■ Block diagram
FA5510P (N), FA5511P (N)
CS(8)
VCC(6)
REF
(7)
5V VCC
ENB
5V REF
3.5V
FB
(2)
Dmax
FA5510: 46%
FA5511: 70%
0.8V/0.68V 5.2µA
0.95mA
15.5V
15.5V UVLO
8.5V/7.9V
0.8V
4V
PWM
16.5V/9V
ENB
OUT
(5)
OUT
PUT
OSC
RT CT
+0.24V
R
QB
SQ
FF
GND
(4)
5V Controlled block
RT(1) IS+(3)
FA5514P (N), FA5515P (N)
CS(8)
VCC(6)
REF
(7)
5V VCC
ENB
5V REF
3.5V
FB
(2)
Dmax
FA5514: 46%
FA5515: 70%
0.8V/0.68V 5.2µA
0.95mA
15.5V
15.5V UVLO
8.5V/7.9V
0.8V
4V
PWM
16.5V/9V
ENB
OUT
(5)
OUT
PUT
OSC
RT CT
-0.17V
R
QB
SQ
FF
GND
(4)
5V Controlled block
RT(1)
IS-(3)
■ Dimensions, mm
SOP-8
8
5
14
4.9
0.4±0.1 1.27
DIP-8
8
5
1
4
9.3
1.5±0.3
2.54
0.46±0.1
7.62
0~15˚
0.25+–00.1.05
0~15˚
Pin Pin
Function
No. symbol
1 RT
Oscillator timing
resistor
2 FB
Feedback
3 IS
Overcurrent
detection
4 GND Ground
5 OUT Output
6 VCC
7 REF
8 CS
Power supply
Reference voltage
Soft-start and
ON/OFF control
Description
Setting oscillation frequency
Input of PWM comparator
Input of the overcurrent
limiting function
Ground
Output for driving a power
MOSFET
Power supply
Reference voltage output (5V)
Soft-start, ON/OFF function and
latch-mode shutdown operations
Type
FA5510P
FA5510N
FA5511P
FA5511N
FA5514P
FA5514N
FA5515P
FA5515N
Max. duty
cycle (typ.)
46%
70%
46%
70%
Polarity of overcurrent Package
detection
+ DIP-8
SOP-8
+ DIP-8
SOP-8
– DIP-8
SOP-8
– DIP-8
SOP-8
1
1 page  
FA551X
■ Characteristic curves (VCC=18V, RT=47kΩ, Ta=25˚C)
Oscillation frequency (fOSC) vs.
timing resistor resistance (RT)
1000
100
10
1
1 10 100 1000
RT (kΩ)
Oscillation frequency (fOSC) vs. supply voltage (VCC)
100.1
100.08
100.06
100.04
100.02
100
99.98
99.96
99.94
99.92
99.9
10
15 20 25
Vcc (V)
30
Oscillation frequency (fOSC) vs.
junction temperature (Tj)
FB pin source current (IFB) vs. FB pin voltage (VFB)
102 0
101.5
101
100.5
100
-100
-200
-300
-400
-500
99.5
99
98.5
–50
0 50 100 150
Tj (˚C)
-600
-700
-800
012345
VFB (V)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
FA5510/14
49
48
47
46
45
44
43
42
1 10 100 1000
RT (kΩ)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
FA5511/15
72
71
70
69
68
67
1 10 100 1000
RT (kΩ)
5
5 Page 
3.2 Overload shutdown function
Figure 9 shows the overload shutdown circuit, and Figure 10 is
a timing chart that illustrates overload shutdown operation.
If the output voltage drops due to an overload or short circuit,
the FB pin output voltage rises. If the FB pin voltage exceeds
the reference voltage (3.5V) of comparator C3, the output of
comparator C3 goes low to turn off the switch. With the switch
off, the CS pin voltage clamped at 4.0V by zener diode in
normal operation is unclamped, and the constant current
source (5.2µA) begins to charge capacitor Cs again and the CS
pin voltage rises. When the CS pin voltage exceeds the
reference voltage (8.5V) of comparator C2, the output of
comparator C2 toggles to turn off the 5V REF circuit. The IC
then enters the latched mode and shuts down the output. IC
current consumption for shutdown is 45µA (typ) (Vcc=10V).
This current must be supplied through the startup resistor. The
IC enters output off (low voltage) state.
The overload shutdown operation can be reset by lowering the
supply voltage Vcc to below the OFF threshold voltage (9.0V)
or forcing the CS pin voltage below 7.9V.
The period tOL from the time the output is short-circuited to the
time the output circuit goes off is given by the following
equation:
tOL [ms] Լ 870 ϫ CS [ms] ..................................................... (4)
Cs: Soft start capacitor [µF]
When you want to disable the overload shutdown function, see
item 9 in “Design advice”
3.3 Output ON/OFF control function
The IC can be turned on or off via an external signal applied to
the CS pin. Figure 11 shows the output on/off control circuit,
and Figure 12 is a timing chart. The IC is turned off when the
CS pin voltage is externally made to drop below 0.68V (typ).
The output of comparator C1 goes high to turn the 5V REF
circuit off. This shuts the output down. The IC enters output off
(low voltage) state. Required IC current consumption during
shutdown is 80µA (typ) (Vcc=17V). This current must be
supplied through the startup resistor. The IC goes on when the
CS pin is opened and the CS pin voltage exceeds 0.80V (typ).
This turns the 5V REF circuit on and results in automatic soft
start. The power supply then restarts operation.
REF 7
FB 2
Cs
CS VCC
86
5V VCC
ENB
5V REF
3.5V
0.8/0.68V
C1
C2
5.2µA
8.5/7.9V
C3
4V
DMAX
PWM
OSC
UVLO
Output
circuit
1
RT
Fig. 9 Overload shutdown circuit
FA551X
Comparator C2
reference voltage
(8.5V)
CS pin voltage (4V)
DT voltage
FB pin voltage
Oscillator output
H
OUT pin voltage
L
REF pin voltage ON
OFF
(9.5V)
(0V)
Overload detection
Overload shutdown
Fig. 10 Overload shutdown timing chart
ON/OFF control
REF 7
5V VCC
ENB
5V REF
Cs
CS VCC
86
C1 0.8/0.68V
C2
8.5/7.9V
5.2µA
UVLO
FB 2
DMAX
OSC
PWM
Output
circuit
1
RT
Fig. 11 External output ON/OFF control circuit
CS pin voltage (4V)
DT voltage
FB pin voltage
Oscillator output
Comparator C1
reference voltage
(0.8/0.68V)
H
OUT pin output L
REF pin voltage ON
OFF
ON mode
OFF mode
Fig. 12 Output ON/OFF control circuit timing chart
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet FA5514P.PDF ] | |
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