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PDF AMC3844B Data sheet ( Hoja de datos )
| Número de pieza | AMC3844B | |
| Descripción | (AMC3842B - AMC3845B) CURRENT MODE PWM CONTROLLER | |
| Fabricantes | ADDtek | |
| Logotipo |  |
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AMC3842B/43B/44B/45B
www.addmtek.com
CURRENT MODE PWM CONTROLLER
DESCRIPTION
FEATURES
The AMC3842B/43B/44B/45B are fixed frequency Low Start-Up current (max. 200µA)
current-mode PWM controllers specially designed for Optimized for Off-Line and DC-to-DC
OFF-Line switching power supply and DC-to-DC converters
Converters
with a minimum number of external components. These
www.DataSheet4dUev.ciocmes feature a trimmed oscillator for precise duty cycle Maximum Duty Cycle
control, a temperature compensated reference, high gain error U.V.L.O. with Hysteresis
amplifier, current sensing comparator, and high current totem Operating Frequency Up to 500KHz
pole output which is suitable for driving MOSFETs.
Internal Trimmed Bandgap Reference
The under voltage lock-out (U.V.L.O.) is designed to High Current Totem Pole Output
operated with 200µA start-up current in typical, allowing an Error Amplifier With Low Output Resistance
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the AMC3842B/44B are 16V (on) and 10V
Available in 8-Pin Plastic DIP and Surface
(off), which are ideal for off-line applications. The
Mount 14-Pin S.O.I.C.
corresponding typical threshold for the AMC3843/45BB is Identical pin assignment to earlier UC384X
8.4V (on) and 7.6V (off). The AMC3842B/43B can operate
within 100% duty cycle and the AMC3844B/45B can operate
series.
within 50% duty cycle.
APPLICATIONS
Off-line flyback or forward converters.
DC-to-DC buck or boost converter.
Monitor Power Supply
Device
AVAILABLE OPTIONS
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B 16V
6V
< 100%
AMC3843B 8.4V
0.8V
< 100%
AMC3844B
AMC3845B
16V
8.4V
6V
0.8V
< 50%
< 50%
PACKAGE PIN OUT
COMP
VREF
VFB
VCC
ISENSE
OUTPUT
RT/CT
GND
8-Pin Plastic DIP
(Top View)
COMP
NC
VFB
NC
ISENSE
NC
RT/CT
VREF
NC
VCC
VC
OUTPUT
GND
PWR
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
COMP
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
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 AMC384XBM (Lead Free) AMC384XBD (Lead Free) AMC384XBDM (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 © 2006 ADDtek Corp.
1 DD019_F -- OCTOBER 2006
1 page  
AMC3842B/43B/44B/45B
ELECTRICAL CHARACTERISTICS (Continued)
Error Amplifier Section
Input Bias Current
Input Voltage
Open Loop Voltage Gain
www.DataSheet4UU.cnoimty Gain Bandwidth (note 8)
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 9)
Fall Time (note 9)
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/44B
VTH(ST) AMC3843B/45B
14.5 16.0 17.5
7.8 8.4 9.0
V
Min. Operating Voltage
AMC3842B/44B
AMC3843B/45B
8.5 10 11.5
V
7.0 7.6 8.2
PWM Section
Maximum Duty Cycle
AMC3842B/43B
Dmax
AMC3844B/45B
94 97 100
%
47 48 50
Total Standby Current
Startup Current
AMC3842B/44B
AMC3843B/45B
0.2
mA
0.2
Operating Supply Current
Zener Voltage
ICC VFB = ISENSE = 0V
VZ ICC = 25mA
14 17 mA
30 35
V
Note 7:
Note 8:
Note 9:
Note 10:
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 © 2006 ADDtek Corp. 5 DD019_F -- OCTOBER 2006
5 Page 
AMC3842B/43B/44B/45B
IMPORTANT NOTICE
www.DataSheet4U.com
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service
without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing
orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of
its products to the specifications applicable at the time of sale.
ADDtek Corp.
9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105
TEL: 2-25700299
FAX: 2-25700196
Copyright © 2006 ADDtek Corp.
11
DD019_F -- OCTOBER 2006
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| PDF Descargar | [ Datasheet AMC3844B.PDF ] | |
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