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PDF AIC3842 Data sheet ( Hoja de datos )
| Número de pieza | AIC3842 | |
| Descripción | Current-Mode PWM Controller | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AIC3842 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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PRELIMINARY
AIC3842
Current-Mode PWM Controller
n FEATURES
l Low Start-Up Current (300µA Typical)
l Internal Precision Reference.
l 500KHz Current-Mode Operation.
l Pulse-by-Pulse Current Limiting.
l Automatic Feed-Forward Compensation.
l Optimized for Off-Line and DC/DC Converters.
l Undervoltage Lockout with Hysteresis.
l Double Pulse Suppression.
l High Current Totem-Pole Output.
n APPLICATIONS
l Off-Line Converter.
l DC/DC Converter.
n DESCRIPTION
The AIC3842 control IC provides the features
that are necessary to implement off-line or
DC/DC Converter fixed-frequency current-mode
schemes with a minimum number of external
components. This integrated circuits features
an undervoltage lockout (UVLO) with
approximately 300µA start-up current, a
precision reference trimmed for accuracy at the
error amplifier input, high gain error amplifier,
current sensing comparator, logic to insure
latched operation, 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.
n TYPICAL APPLICATION CIRCUIT
2 VFB
7
VCC
C2 +
R3 300pF C3
51K 1000P
FEEDBACK
SIGNAL
C5
0.1µF
R4
7.5K
C4
2.2nF
1 COMP
8 VREF
6
OUTPUT
GND 5
R1
10
4 RT/CT
3
ISENSE
AIC3842
C6
300P
C1
47µF
VCC
INDUCTOR
M1
R2
20K
R5
390
C7
1nF
RS
0.33
Current Mode PWM Control Circuit
n ORDERING INFORMATION
AIC3842CX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
ORDER NUMBER
PIN CONFIGURATION
AIC3842CN
(PLASTIC DIP)
AIC3842CS
(PLASTIC SO)
COMP 1
VFB 2
ISENSE 3
RT/CT 4
8 VREF
7 VCC
6 OUTPUT
5 GND
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-3842-P1 May 5, 00
TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1
1 page  
AIC3842
n BLOCK DIAGRAM
VCC 7
ZD
5 34V
GND
UVLO
S/R
5V
REF
Internal Bias
4
RT/CT
VFB
COMP
2
1
3
ISENSE
2.50V
OSC
Error Amp.
D1 D2 R2
VREF
Good
Logic
PWM
S Latch
R
Z1 Current
1V Sense
comparator
8
Q1
6
Q2
VREF
5V/50mA
OUTPUT
n PIN DESCRIPTIONS
PIN 1: COMP
- This pin is the error amplifier
output and is made available for
loop compensation.
PIN 2: VFB
- This is the inverting input of the
error amplifier. It is normally
connected to the switching
power supply output through a
resistor divider.
PIN 3: ISENSE - A voltage proportional to
inductor current is connected to
this input. The PWM uses this
information to terminate the
output switch conduction.
PIN 4: RT/CT
- The oscillator frequency and
maximum output duty cycle are
programmed by connecting
resistor RT to VREF and capacitor
CT to ground. Operation to
500KHz is feasible.
PIN 5: GND-
This pin is the combined control
circuitry and power ground.
PIN 6:
OUTPUT- This output directly drives the
gate of a power MOSFET. Peak
currents up to 1A are sourced
and sunk by this pin.
PIN 7: VCC -
This pin is the positive supply of
the control IC.
PIN 8: VREF -
This is the reference output. It
provides charging current for
capacitor CT through resistor RT.
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet AIC3842.PDF ] | |
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