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PDF FP5137A Data sheet ( Hoja de datos )
| Número de pieza | FP5137A | |
| Descripción | 1 CHANNEL SYNCHRONOUS PWM CONTROL IC | |
| Fabricantes | Feeling Technology | |
| Logotipo |  |
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Technology
FP5137A
1 CHANNEL SYNCHRONOUS PWM CONTROL IC
GENERAL DESCRIPTION
The FP5137A is a synchronous buck switching regulator control IC for DC-DC applications
field. The FP5137A 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 400KHz
oscillator and programmable soft start function.
FEATURES
Feedback Reference Voltage: 0.8V (2%)
Peak Output Source/Drive Capability: 500mA
Internal 400KHz Oscillator
Programmable Soft Start function (SS)
Short Circuit Protection function(SCP)
Internal UVLO function
Package: PDIP8/SOP8/SOP8(EP)
SOP8
TYPICAL APPLICATION
VGA Card
High Efficiency DC-DC Converter
Battery Charger
Website: http://www.feeling-tech.com.tw
Rev0.2 Sept. 25, 2006
P1/FP5137A
1 page  
Technology
FP5137A
DC ELECTRICAL CHARACTERISTICS(Ta=25 ,VCC=+5V, VC=+12V,unless
otherwise noted)
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 MAX
4.2 4.4
0.25
3.3 3.5
0.25
0.4 0.5
0.1
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
f
TYP MAX UNIT
400 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
Rev0.2 Sept. 25, 2006
P5/FP5137A
5 Page 
Technology
FP5137A
BASIC APPLICATION NOTE (Single Power Supply)
Vin +5V
C9
104
R2
10k 1%
R1
20k 1%
IC1
1 FB
SS 8
2 Vcc COMP 7
3 LDrv
Vc 6
4 Gnd
HDrv 5
FP5137A
D2
D4
D3
R3
100k
C8 C7 C6 C5
1uF
680pF
104
104
Q1
Q2
L2
C2
220uF
2.2uH
C1
220uF
L1
15uH
D1
+1.2V
C4
220uF
C3
220uF
Figure 10. FP5137A 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
Rev0.2 Sept. 25, 2006
P11/FP5137A
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FP5137A.PDF ] | |
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