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PDF AMC3842B Data sheet ( Hoja de datos )
| Número de pieza | AMC3842B | |
| Descripción | (AMC3842B / AMC3843B) CURRENT MODE PWM CONTROLLER | |
| Fabricantes | ETC | |
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AMC DOC. #: AMC3842B_C (LF)
March 2004
A®
DD MICROTECH CORP.
AMC3842B/43B
CURRENT MODE PWM CONTROLLER
DESCRIPTION
The AMC3842B/43B are fixed frequency current-mode
PWM controllers specially designed for OFF-Line switching
power supply and DC-to-DC converters with a minimum
number of external components. These devices feature a
trimmed oscillator for precise duty cycle control, a
temperature compensated reference, high gain error
amplifier, current sensing comparator, and high current
totem pole output which is suitable for driving MOSFETs.
The under voltage lock-out (U.V.L.O.) is designed to
operated with 200µA typ. start-up current, allowing an
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the AMC3842B are 16V (on) and 10V (off)
which are ideal for off-line applications. The corresponding
typical threshold for the AMC3843B are 8.4V (on) and 7.6V
(off). The AMC3842B/43B can operated within 100% duty
cycle.
FEATURES
Low Start-Up current ( typ. 200µA)
Optimized for Off-Line and
DC-to-DC Converters
Maximum Duty Cycle
U.V.L.O. with Hysteresis
Operating Frequency Up to 500KHz
Internal Trimmed Bandgap Reference
High Current Totem Pole Output
Error Amplifier With Low Output
Resistance
Available in 8-Pin Plastic DIP and
Surface Mount 14-Pin S.O.I.C.
Identical pin assignment to earlier
UC384X series.
APPLICATIONS
Off-line flyback or forward
converters.
DC-to-DC buck or boost
converter.
Monitor Power Supply
AVAILABLE OPTIONS
Device
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B 16V 6V
< 100%
AMC3843B 8.4V 0.8V
< 100%
PACKAGE PIN OUT
COMP
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
COMP
8-Pin Plastic DIP
(Top View)
VREF
NC
VFB
NC
ISENSE
NC
NC
VCC
VC
OUTPUT
GND
COMP
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
RT/CT
PWR
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
ORDER INFORMATION
TA (OC)
M Plastic DIP-8
8-pin
D Plastic SO-14
14-pin
DM Plastic SO-8
8-pin
0 to 70 AMC384XBM
AMC384XBD
AMC384XBDM
0 to 70 AMC384XBMF(Lead Free) AMC384XBDF(Lead Free) AMC384XBDMF(Lead Free)
Note: 1.All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e.
AMC384XBDT, or AMC384XBDMT).
2.The letter ”F” is marked for Lead Free process.
Copyright © 2002, ADD Microtech Corp.
1
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1 page  
AMC DOC. #: AMC3842B_C (LF)
March 2004
AMC3842B/43B
CURRENT MODE PWM CONTROLLER
ELECTRICAL CHARACTERISTICS (Continued)
Error Amplifier Section
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Unity Gain Bandwidth (note 7)
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
Output Section
IBIAS
-0.1 -2 µA
VI(EA) COMP = 2.5V
2.42 2.50 2.58 V
GVO 2V ≤ VO ≤ 4V
65 90
dB
UGBW TJ = 25 OC
0.7 1
MHz
PSRR 12V ≤ VCC ≤ 25V
60 70
dB
ISINK VFB = 2.7V, COMP = 1.1V
27
mA
ISOURCE VFB = 2.3V, COMP = 5.0V
-0.5 -1.0
mA
VOH VFB = 2.3V, RL = 15KΩ to GND 5
6
V
VOL VFB = 2.7V, RL = 15KΩ to VREF
0.7 1.1 V
Output Low Level
Output High Level
Rise Time (note 7)
Fall Time (note 7)
Under-Voltage Lockout Section
VOL
ISINK = 20mA
ISINK = 200mA
VOH
ISOURCE = 20mA
ISOURCE = 200mA
tr TJ = 25 OC, CL = 1nF
tf TJ = 25 OC, CL = 1nF
0.1 0.4
1.4 2.2
13 13.5
12 13.0
50 150
50 150
V
V
ns
ns
Start Threshold
AMC3842B
VTH(ST) AMC3843B
14.5 16.0 17.5
7.8 8.4 9.0
V
Min. Operating Voltage
AMC3842B
AMC3843B
8.5 10 11.5
V
7.0 7.6 8.2
PWM Section
Maximum Duty Cycle
AMC3842B/43B
94 97 100 %
Total Standby Current
Startup Current
AMC3842B
AMC3843B
0.2 0.35
mA
0.5 1.0
Operating Supply Current
Zener Voltage
ICC VFB = ISENSE = 0V
VZ ICC = 25mA
14 17 mA
30 35
V
note 6:
note 7:
note 8:
note 9:
Adjust VCC above the start threshold before setting at 15V
These parameters, although guaranteed, are not 100% tested in production prior to shipment
Parameters are measured at trip point of latch with VFB = 2V
Gain is measured between ISENSE and COMP with the input changing from 0V to 0.8V
Copyright © 2002, ADD Microtech Corp.
5
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AMC3842B.PDF ] | |
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