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PDF FP3843 Data sheet ( Hoja de datos )
| Número de pieza | FP3843 | |
| Descripción | OFF-LINE CURRENT MODE PWM CONTROL IC | |
| Fabricantes | Feeling Technology | |
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Technology
FP3843
OFF-LINE CURRENT MODE PWM CONTROL IC
GENERAL DESCRIPTION
The FP3843, a 1-chip composed of high-current totem pole output circuits with a PWM latch,
current sense comparator and an error amplifier, the FP3843 contains a 5V precision voltage
reference regulator, under-voltage lockout circuit (UVLO), oscillator circuit, applied to offer
space and low cost in many applications such as the DC/DC converter and off-line switching
power supply.
Using few external components, FP3843, a high performance integrated IC, is designed for a
control circuit. The circuit diagram of the typical application example is as below.
FEATURES
Precision Reference Voltage: 5.0V (±1%)
Low start-up current: typ. 60uA
High current totem pole output
Low quiescent supply current
Internal temperature compensated oscillator
Double pulse suppression
UVLO with Hysteresis function
Oscillator Frequency: Max. 500KHz
Package: PDIP8 / SOP8
TYPICAL APPLICATION
DC-DC Converter
SMPS
AC-DC Adaptor
PDIP8
SOP8
Rev0.1 May 01, 2004
P1/FP3843
1 page  
Technology
FP3843
DC Electrical Characteristics
(VCC=15V, RT=10K,CT=3.3nF,0 TA 70 , unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX
Reference Section
Output Voltage
Line Regulation
Load Regulation
Output Short Circuit
VREF
VREF
VREF
ISC
Tj=25 , IREF=1mA
12V VCC 25V
1mA IREF 20mA
TA=25
Oscillator Section
Oscillation Frequency
Voltage Stability
Temperature Stability
Ampiltude
f
f/ VCC
f/ TA
VOSC
Tj=25
12V VCC 25V
TMIN TA TMAX
VP-P of OSC pin
Error Amplifier Section
Input Bias Current
IBIAS
VFB=5V
Input Voltage
VI(EA)
VCOMP=2.5V
Open Loop Gain
Unity Gain Bandwidth
Power Supply
Rejection Ratio
Output Sink Current
Output Source
Current
VCOMP High Voltage
VCOMP Low Voltage
AVOL
BWU
PSRR
ISINK
ISOURCE
VOH
VOL
2V VOUT 4V
Note 3
12V VCC 25V
VFB=2.7V,VCOMP=1.1V
VFB=2.3V,VCOMP=5V
VFB=2.3V,
to GND
VFB=2.7V,
to VREF
RL=15KΩ
RL=15KΩ
Current Sense Section
4.9
49
2.42
65
0.7
60
2
-0.5
5.0
Gain
Maximum Input
Signal
Supply Voltage
Rejection
Input Bias Current
Delay to Output
GV
VI (MAX)
SVR
IBIAS
tDO
(Note 1 & 2)
2.85
VCOMP=5V(Note 1)
12V
VCC
(Note 1)
25V
0.9
5.0
2.0
3.0
-100
5.1
20
25
-180
52 55
0.2 1.0
0.5
1.6
-0.1 -2.0
2.5 2.58
90
1.0
70
7
-1.0
6.0
0.8 1.1
3.0 3.15
1.0 1.1
70
-2 -10
150 300
UNIT
V
mV
mA
KHz
%
%
V
µA
V
dB
MHz
dB
mA
V
V/V
V
dB
µA
ns
Rev0.1 May 01, 2004
P5/FP3843
5 Page 
Technology
FP3843
Oscillator and Output Waveforms
It uses an external RC circuit for oscillation of FP3843, CT is charged from VREF and through
RT and discharged to the internal circuits including a source current ID and a NPN transistor.
The waveforms of different RT/CT are also shown as below.
The charge and discharge time could be calculated by these formulas:
For example:
FP3843 VREF=5.0V, VHIGH=2.7V, VLOW=1.0V, ID=8.3mA (IC specification)
And external RT= 10KΩ, CT= 3.3nF
tC = 10000 * 3.3e-9 * ln (4/2.3) = 0.000033 * 0.5534 = 18.26µs
tD = 10000 * 3.3e-9 * ln (1.02) = 0.000033 * 0.021 = 0.7µs
fOSC= 1 / (tC + tD) = 52.74KHz
Rev0.1 May 01, 2004
P11/FP3843
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet FP3843.PDF ] | |
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