AMC3842B Datasheet, PDF (5/10 Pages) List of Unclassifed Manufacturers – CURRENT MODE PWM CONTROLLER

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
I_BIAS
-0.1 -2 µA
V_I(EA) COMP = 2.5V
2.42 2.50 2.58 V
G_VO 2V ≤ V_O ≤ 4V
65 90
dB
UGBW T_J = 25 ^OC
0.7 1
MHz
PSRR 12V ≤ V_CC ≤ 25V
60 70
dB
I_SINK V_FB = 2.7V, COMP = 1.1V
27
mA
I_SOURCE V_FB = 2.3V, COMP = 5.0V
-0.5 -1.0
mA
V_OH V_FB = 2.3V, R_L = 15KΩ to GND 5
6
V
V_OL V_FB = 2.7V, RL = 15KΩ to V_REF
0.7 1.1 V
Output Low Level
Output High Level
Rise Time (note 7)
Fall Time (note 7)
Under-Voltage Lockout Section
V_OL
I_SINK = 20mA
I_SINK = 200mA
V_OH
I_SOURCE = 20mA
I_SOURCE = 200mA
t_r
T_J = 25 ^OC, C_L = 1nF
t_f
T_J = 25 ^OC, C_L = 1nF
0.1 0.4
V
1.4 2.2
13 13.5
V
12 13.0
50 150 ns
50 150 ns
Start Threshold
AMC3842B
V_{TH(ST) AMC3843B}
14.5 16.0 17.5
V
7.8 8.4 9.0
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
I_CC
V_FB = I_SENSE = 0V
V_Z I_CC = 25mA
14 17 mA
30 35
V
note 6:
note 7:
note 8:
note 9:
Adjust V_CC 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 V_FB = 2V
Gain is measured between I_SENSE and COMP with the input changing from 0V to 0.8V
Copyright © 2002, ADD Microtech Corp.
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