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AMC3844B Datasheet(PDF) 5 Page - ADDtek Corp

Part No. AMC3844B
Description  CURRENT MODE PWM CONTROLLER
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Maker  ADDTEK [ADDtek Corp]
Homepage  http://www.addmtek.com
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AMC3844B Datasheet(HTML) 5 Page - ADDtek Corp

 
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AMC3842B/43B/44B/45B
Copyright
© 2006 ADDtek Corp.
5
DD019_F
--
OCTOBER 2006
ELECTRICAL CHARACTERISTICS (Continued)
Error Amplifier Section
Input Bias Current
IBIAS
-0.1
-2
µA
Input Voltage
VI(EA)
COMP = 2.5V
2.42
2.50
2.58
V
Open Loop Voltage Gain
GVO
2V
≤ V
O ≤ 4V
65
90
dB
Unity Gain Bandwidth (note 8)
UGBW
TJ = 25
OC
0.7
1
MHz
Power Supply Rejection Ratio
PSRR
12V
≤ V
CC ≤ 25V
60
70
dB
Output Sink Current
ISINK
VFB = 2.7V, COMP = 1.1V
2
7
mA
Output Source Current
ISOURCE
VFB = 2.3V, COMP = 5.0V
-0.5
-1.0
mA
High Output Voltage
VOH
VFB = 2.3V, RL = 15KΩ to GND
5
6
V
Low Output Voltage
VOL
VFB = 2.7V, RL = 15KΩ to VREF
0.7
1.1
V
Output Section
ISINK = 20mA
0.1
0.4
Output Low Level
VOL
ISINK = 200mA
1.4
2.2
V
ISOURCE = 20mA
13
13.5
Output High Level
VOH
ISOURCE = 200mA
12
13.0
V
Rise Time (note 9)
tr
TJ = 25
OC, CL = 1nF
50
150
ns
Fall Time (note 9)
tf
TJ = 25
OC, CL = 1nF
50
150
ns
Under-Voltage Lockout Section
AMC3842B/44B
14.5
16.0
17.5
Start Threshold
VTH(ST)
AMC3843B/45B
7.8
8.4
9.0
V
AMC3842B/44B
8.5
10
11.5
Min. Operating Voltage
AMC3843B/45B
7.0
7.6
8.2
V
PWM Section
AMC3842B/43B
94
97
100
Maximum Duty Cycle
Dmax
AMC3844B/45B
47
48
50
%
Total Standby Current
AMC3842B/44B
0.2
Startup Current
AMC3843B/45B
0.2
mA
Operating Supply Current
ICC
VFB = ISENSE = 0V
14
17
mA
Zener Voltage
VZ
ICC = 25mA
30
35
V
Note 7:
Adjust VCC above the start threshold before setting at 15V
Note 8:
These parameters, although guaranteed, are not 100% tested in production prior to shipment
Note 9:
Parameters are measured at trip point of latch with VFB = 2V
Note 10:
Gain is measured between ISENSE and COMP with the input changing from 0V to 0.8V


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