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PDF FP5137B Data sheet ( Hoja de datos )
| Número de pieza | FP5137B | |
| Descripción | 1 CHANNEL SYNCHRONOUS PWM CONTROL IC | |
| Fabricantes | Feeling | |
| Logotipo |  |
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Technology
FP5137B
1 CHANNEL SYNCHRONOUS PWM CONTROL IC
GENERAL DESCRIPTION
The FP5137B is a synchronous buck switching regulator control IC for DC-DC applications
field. The FP5137B includes a totem-pole high/low side stage for driving NMOS, high precision
reference (0.8V) for comparing output voltage with feedback amplifier, an internal 200KHz
oscillator and programmable soft start function.
FEATURES
Feedback Reference Voltage: 0.8V (2%)
Peak Output Source/Drive Capability: 500mA
Internal 200KHz Oscillator
Programmable Soft Start function (SS)
Short Circuit Protection function(SCP)
Internal UVLO function
Package: PDIP8/SOP8
SOP8
TYPICAL APPLICATION
VGA Card
High Efficiency DC-DC Converter
Battery Charger
VIN
Vcc
SS
Vc
HDrv
FP5137B
LDrv
Comp
Gnd
FB
Website: http://www.feeling-tech.com.tw
VOUT
Rev0.1 July 21, 2005
P1/FP5137B
Free Datasheet http://www.datasheetlist.com/
1 page  
Technology
FP5137B
DC ELECTRICAL CHARACTERISTICS
Under Voltage Lock-Out section (U.V.L.O.)
PARAMETER
UVLO threshold voltage
Hysteresis voltage
UVLO threshold voltage
Hysteresis voltage
UVLO threshold voltage
Hysteresis voltage
SYMBOL
VCC (UVLO)
VCC (HYS)
VC (UVLO)
VC (HYS)
VFB (UVLO)
VFB (HYS)
TEST CONDITIONS
Sweep up VCC
Sweep up VC
Sweep down FB
MIN
4.0
3.1
0.3
TYP
4.2
0.25
3.3
0.25
0.4
0.1
MAX
4.4
3.5
0.5
UNIT
V
V
V
V
V
V
Soft Start section (S.S.)
PARAMETER
Input source current
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
ISS
VSS= 0V
-10 -20 -30
A
Oscillator section
PARAMETER
Oscillation frequency
Frequency change with
voltage
Frequency change with
temperature
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
f 180 200 220 KHz
∆f / ∆V
VCC=5V to 25V
2 10
%
∆f / ∆T
Ta = -10 to 85
5%
Period Adjustment section
PARAMETER
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Maximum duty cycle
Minimum duty cycle
TDUTY (ON)
TDUTY (OFF)
VFB=1.0V
VFB=1.5V
85 90 95
00
%
%
Website: http://www.feeling-tech.com.tw
Rev0.1 July 21, 2005
P5/FP5137B
Free Datasheet http://www.datasheetlist.com/
5 Page 
Technology
FP5137B
BASIC APPLICATION NOTE (Single Power Supply)
L2
D2 D3
2.2uH
D4
+ C2
U1 220uF
1 FB
SS 8
2 VCC COMP 7
3 LDrv
VC 6
R3
C9
104
4 GND HDrv 5
100K
FP5137B
C8 C7 C6
C5
1uF 680pF 104 104
+5V
+ C1
100uF
R2
R1
20K 1%
10K 1%
Q1
L1
15uH
D1
Q2
+1.2V
+ C4
220uF
+ C3
220uF
Figure 10. FP5137B DC/DC Converter circuit using single power supply
Application Description
This application circuit is same as dual power supply but VC pin uses a charge-pump circuit
with D2~D4 and C5, C8.
The C5 capacitor would charge near +5V through D3 when +5V power supply is turn-on, the
voltage of VC is a sum of C5 voltage and VIN-VDIODE voltage, is higher than Q1 source terminal
during Q1 turns on.
Website: http://www.feeling-tech.com.tw
Rev0.1 July 21, 2005
P11/FP5137B
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FP5137B.PDF ] | |
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