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PDF UTC3842 Data sheet ( Hoja de datos )
| Número de pieza | UTC3842 | |
| Descripción | CURRENT MODE PWM CONTROL CIRCUITS | |
| Fabricantes | YOUWANG ELECTRONICS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UTC3842 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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UTC3842
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM CONTROL
CIRCUITS
DESCRIPTION
The UTC3842 provides the necessary features to
implement off-line or DC to DC fixed frequency current mode
control schemes with a minimal external parts count.
Internally implemented circuits include under-voltage lockout
featuring start up current less than 1mA,a precision
reference trimmed for accuracy at the error amp input, logic
to insure latched operation, a PWM comparator which also
provides current limit control, and a totem pole output stage
designed to source or sink high peak current. The output
stage, suitable for driving N channel MOSFETs, is low in the
off state.
DIP-8
SOP-8
FEATURES
*Optimized for off-line and DC to DC converts
*Low start up current(<1mA)
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Enhanced load response characteristics
*Under-voltage lockout with hysteresis
BLOCK DIAGRAM
*Double pulse Suppression
*High current totem pole output
*Internally trimmed band-gap reference
*500kHz operation
*Low Ro error amp
Vref 8
Internal
Bias
VFB 2
COMP 1
CURRENT SENSE 3
RT/CT 4
1/2Vref
ERROR
AMPLIFIER
5V REF
S/R
Vref
Good
Logic
1/3Vref
U.V.L.O
CURRENT
SENSE
COMPAREATOR
1V R
PWM
LATCH
S
OSCILLATOR
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
YOUWANG ELECTRONICS CO.LTD
1
2005.06.09 V1.1
1 page  
UTC3842
SLOPE COMPENSATION
LINEAR INTEGRATED CIRCUIT
8
RT
4
CT
R1 Isense
R2
3
C Rsense
A fraction of the oscillator ramp can be resistively
summed with the current sense signal to provide slope
compensation for converts requiring duty cycles over
50%.Note that capacitor C, forms a filter with R2 to
suppress the leading edge switch spikes.
OSCILLATOR SECTION
8
4
5
Large RT
Small CT
RT
CT Small RT
Large CT
V4
INTERNAL
CLOCK
V4
INTERNAL
CLOCK
100
td (µs)
10
ΩDeadtime VS CT(RT>5k )
1
0.1
1
10 100
CT (nF)
Timing Resistance Vs Frequency
100
RT (kΩ)
10
1
102
CT=1nF
CT=2.2nF
CT=4.7nF
CT=10nF
CT=22nF
CT=47nF
CT=100nF
103 104 105
Frequency (Hz)
10 6
YOUWANG ELECTRONICS CO.LTD
5
2005.06.09 V1.1
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet UTC3842.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| UTC3842 | CURRENT MODE PWM CONTROL CIRCUITS | YOUWANG ELECTRONICS |
| UTC3842A | (UTC3842A /UTC3843A) CURRENT MODE PWM CONTROL CIRCUITS |  UNISONIC TECHNOLOGIES |
| UTC3843A | (UTC3842A /UTC3843A) CURRENT MODE PWM CONTROL CIRCUITS | UNISONIC TECHNOLOGIES |
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