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PDF FP3842 Data sheet ( Hoja de datos )
| Número de pieza | FP3842 | |
| Descripción | OFF-LINE CURRENT MODE PWM CONTROL IC | |
| Fabricantes | Feeling Technology | |
| Logotipo |  |
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Technology
FP3842
OFF-LINE CURRENT MODE PWM CONTROL IC
GENERAL DESCRIPTION
The FP3842, a 1-chip composed of high-current totem pole output circuits with a PWM latch,
current sense comparator and an error amplifier, the FP3842 contains a 5V precision voltage
reference regulator, under-voltage lockout circuit (UVLO), oscillator circuit and a green power
function, applied to offer space and low cost in many applications such as the DC/DC
converter and off-line green mode adaptor or switching power supply.
FEATURES
Precision Reference Voltage: 5.0V (±2%)
Low start-up current: typ. 120uA
High current totem pole output: typ. 700mA
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
Rev0.2 May.06, 2005
P1/FP3842
1 page  
Technology
FP3842
DC Electrical Characteristics: (VCC=15V, RT=10K,CT=3.3nF,0
otherwise specified)
TA 70 , unless
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Reference Section
Output Voltage
Line Regulation
VREF
VREF
Tj=25 , IREF=1mA
12V VCC 25V
Load Regulation
Output Short Circuit
VREF
ISC
1mA IREF 10mA
TA=25
Oscillator Section
Oscillation Frequency
Voltage Stability
Temperature Stability
f
f / VCC
f / TA
Tj=25
12V VCC 25V
TMIN TA TMAX
Ampiltude
Discharge Current
VOSC
IDC
VP-P of OSC pin
TMIN TA TMAX
Error Amplifier Section
Input Bias Current
IBIAS
VFB=3V
Input Voltage
Open Loop Gain
VI(EA)
AVOL
VCOMP=2.5V
2V VOUT 4V
Unity Gain Bandwidth
Power Supply
Rejection Ratio
Output Sink Current
Output Source
Current
VCOMP High Voltage
VCOMP Low Voltage
BWU
PSRR
ISINK
ISOURCE
VOH
VOL
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
47
7.2
2.43
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)
VCS =3V
25V
0.9
5.0
6.0
6.0
-100
5.1
20
25
-180
52 57
0.05 1.0
8
1.7
9.5
-0.1 -2.0
2.5 2.58
90
1.0
70
7
-1.0
6.0
0.7 1.1
3.0 3.15
1.0 1.1
70
-2 -10
150 300
V
mV
mA
KHz
%
%
V
mA
µA
V
dB
MHz
dB
mA
V
V/V
V
dB
µA
ns
Rev0.2 May.06, 2005
P5/FP3842
5 Page 
Technology
FP3842
Oscillator and Output Waveforms
FP3842 uses an external RC circuit for oscillation. CT is charged from VREF 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.
VCC
VREF
RT
OSC
PWM
Reference
Regulator
OSCILLATOR
Id
OUT
CT
GND
OSC
OUT
Large RT/Small CT
OSC
OUT
Small RT/Large CT
Rev0.2 May.06, 2005
P11/FP3842
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet FP3842.PDF ] | |
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