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UC3578 датащи(PDF) 2 Page - Texas Instruments

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номер детали UC3578
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC2578
UC3578
ELECTRICAL CHARACTERISTICS: Unless otherwise specified VCC = 14V, VGG = 14V, TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Section
Frequency
VCC = 14V to 72V, EAINV = 1.9V, TJ = 25°C
100
110
120
kHz
VCC = 11V to 14V, Over Temperature
90
120
kHz
Error Amplifier Section
EAINV
EAOUT = EAINV
1.97
2
2.03
V
IEAINV
EAOUT = EAINV
100
300
nA
EAVOL
EAOUT/EAINV, 25°C
70
80
dB
EAOUT High
EAINV
≤ 1.9V, IEAOUT = –100µA
5.5
6.2
V
EAOUT Low
EAINV
≥ 2.1V, IEAOUT = 100µA
0.8
1.1
V
Unity Gain Bandwidth
TJ = 25°C, F = 100kHz
0.85
1
MHz
PSRR, EAOUT
EAOUT = EAINV, VCC = 14V
80
90
dB
Current Sense Comparator Section
Threshold (Referred to VCC)
0.4
0.5
0.6
V
Input Bias Current
CS = VCC – 0.4V
0.2
1
µA
Propagation Delay
VOVERDRIVE = 250mV
0.7
1.2
µs
Blanking Time
VOVERDRIVE = 250mV
75
200
300
ns
Gate Drive Output Section
VOH
IOUT = –200mA
9.5
11
V
VOL
IOUT = 20mA
0.2
0.36
V
IOUT = 200mA
1.5
2
V
Rise Time
TJ = 25°C, CLOAD = 1nF
40
70
ns
Fall Time
TJ = 25°C, CLOAD = 1nF
40
70
ns
Pulse Width Modulator Section
Maximum Duty Cycle
EAINV
≤ 1.9V
85
90
%
Minimum Duty Cycle
EAINV
≥ 2.1V
0
%
Modulator Gain
EAOUT = 2.5V to 3.5V
30
%/V
Undervoltage Lockout Section
Start Threshold
OUT – SRC, EAINV
≤ 1.9V, SRC = 0V
10
11
12
V
UVLO Hysteresis
1.5
2
2.5
V
CONNECTION DIAGRAM
Note: The four GND pins are internally connected.
DIL-16, SOIC-16 (Top View)
N or DP Packages
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +72V
EAINV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
EAOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
DIODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC
VGG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC +14V
CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC – 5V to VCC +0.6V
IOUT Pulsed . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.8A to +0.6A
SRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.6V to VCC
Storage Temperature . . . . . . . . . . . . . . . . . . .
−65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
ABSOLUTE MAXIMUM RATINGS
Not Recommended for New Designs


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