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PDF FP5453 Data sheet ( Hoja de datos )
| Número de pieza | FP5453 | |
| Descripción | DUAL PWM CONTROL IC | |
| Fabricantes | Feeling Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FP5453 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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Technology
FP5453
DUAL PWM CONTROL IC
WITH SHORT CIRCUIT RESTART FUNCTION
GENERAL DESCRIPTION
The FP5453, a 1-chip composed of totem-pole output stage pulse-width-modulation control
circuits with two error amplifiers and dead-time comparators (DTC), the FP5453 contains a
2.5V precision voltage reference regulator, under-voltage lockout circuit (UVLO),
programmable auto-restart timer for short circuit protection (SCSAR), applied to offer space
and low cost in many applications such as the DC/DC converter.
Using few external components, FP5453, a high performance integrated IC, is designed for a
control circuit. The circuit diagram of the typical application example is as below.
FEATURES
Fixed Reference Voltage: 2.5V
Reference Voltage Precision: 2%
Totem-pole output stage
Low quiescent supply current under 4mA
Wide operating voltage range: 3.6~25V
Variable dead-time control (DTC)
UVLO protection function
Short circuit shutdown/auto re-start function (SCSAR)
Oscillator Frequency: Max. 1.2MHz
Package: SOP16/PDIP16/SSOP16/SOP16(EP)
SOP16
PDIP 16
TYPICAL APPLICATION
HUB/Router
Set Top Box
HDD Server
CATV
SSOP 16
Website: http://www.feeling-tech.com.tw
Rev0.3 Jan. 25, 2007
P1/FP5453
1 page  
Technology
FP5453
DC ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating free-air temperature range, VCC=6V,
f=200kHz (unless otherwise noted)
Reference section
PARAMETER
Output voltage (pin 16)
Output voltage change with
Temperature
Input voltage regulation
Output voltage regulation
Short-circuit output current
SYMBOL TEST CONDITIONS
VREF
IO=1mA
TA=-20 to 25
TA=25 to 85
VREF /VREF Vcc=3.6V 25V
VREF /VREF Io = 0.1mA to 1 mA
ISHORT VO=0
MIN
2.45
3
TYP
2.5
-0.1
-0.2
2
3
10
MAX
2.55
±1
±1
12.5
8
30
UNIT
V
%
mV
mV
mA
Under voltage lockout section
PARAMETER
Upper threshold voltage(Vcc)
Lower threshold voltage(Vcc)
Hysteresis (Vcc)
SYMBOL
VUPPER
VLOW
VHYS
TEST CONDITIONS
IO(REF) = 0.1 mA,
TA=25
MIN TYP MAX UNIT
3.2 V
3.0 V
100 200
mV
Short-circuit protection control section
PARAMETER
SCP re-start voltage
SYMBOL TEST CONDITIONS
VRS VFB1 or VFB2 <1.5V
SCP threshold voltage
VTH VFB1 or VFB2 <1.5V
SCP re-start charge current
IRSC
VFB1 or VFB2 <1.5V
SCP re-start / hold time
SCP comparator 1 threshold
voltage
TRS /THOLD
VCOMP(TH)
VFB1 or VFB2 <1.5V
MIN TYP MAX UNIT
0.5 V
1.0 V
20 A
1/50
1.2 V
Oscillator section
PARAMETER
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Frequency
f CT=330pF,RT=10K
200 KHZ
Frequency change with voltage
f/ V VCC=3.6V to 25V
0.2 %
Frequency change with
Temperature
f/ T
TA=-20 to 25
TA=25 to 85
-0.4 ±2
-0.2 ±2
%
%
Website: http://www.feeling-tech.com.tw
Rev0.3 Jan. 25, 2007
P5/FP5453
5 Page 
Technology
FP5453
Error Amplifier
The error amplifiers of FP5453 compare the feedback voltage from the resistive dividers of
dc-dc converter output to the reference bias(see Fig 15), and generate the error signal for the
PWM comparator, the relation formulas are shown as below:
VOUT
2.5V
16
REF
R5 R1
3
EA1
4
R6 R2
5
DTC1
PWM
Comparator
R7 C1
OSC
C2
Compensation
Network
Figure 15. Error amplifier with Feedback/Compensation Circuits
The Buck converter output voltage:
VOUT
= 1 +
R5
R6
×
R2
R1 + R2
×
2.5V
Error Amplifier Gain:
Av
=1+
1+ sR7C1
sRi(C1+ C2)(1+ sR7C2)
,Ri=R1//R2
Error Amplifier Zero and Pole Frequency:
Fz
=
1
2ΠR7C1
,
Fp
=
1
2ΠR7C 2
Website: http://www.feeling-tech.com.tw
Rev0.3 Jan. 25, 2007
P11/FP5453
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet FP5453.PDF ] | |
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