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UC1573 Datasheet(Fiches technique) 2 Page - Texas Instruments

Numéro de pièce UC1573
Description  Buck Pulse Width Modulator Stepdown Voltage Regulator
Télécharger  5 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC1573 Datasheet(HTML) 2 Page - Texas Instruments

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UC1573
UC2573
UC3573
DIL-8, SOIC-8 (TOP VIEW)
J or N, D Packages
ABSOLUTE MAXIMUM RATINGS
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
EAINV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.6V to VCC
IEAOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
RAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 4V
CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC
IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.7A to 0.7A
I3VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –15mA
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of packages.
CONNECTION DIAGRAMS
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, these parameters apply for TA = –55°C to +125°C for
the UC1573, –40°C to +85°C for the UC2573, and 0°C to +70°C for the UC3573, VCC = 5V, CT = 680pF, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Reference Section
3VREF
2.94
3
3.06
V
Line Regulation
VCC = 4.75 to 30V
1
10
mV
Load Regulation
I3VREF = 0 to –5mA
1
10
mV
Oscillator Section
Frequency
VCC = 5V, 30V
85
100
115
kHz
Error Amp Section
EAINV
EAOUT = 2V
1.45
1.5
1.55
V
IEAINV
EAOUT = 2V
–0.2
–1
µA
AVOL
EAOUT = 0.5V to 3V
65
90
dB
EAOUT High
EAINV = 1.4V
3.6
4
4.4
V
EAOUT Low
EAINV = 1.6V
0.1
0.2
V
IEAOUT
EAINV = 1.4V, EAOUT = 2V
–350
–500
µA
EAINV = 1.6V, EAOUT = 2V
7
20
mA
Unity Gain Bandwidth
TJ = 25°C, F = 10kHz
0.6
1
MHz
Current Sense Comparator Section
Threshold (referred to VCC)
–0.39
–0.43
–0.47
V
Input Bias Current
CS = VCC
150
800
nA
CS Propagation Delay
400
ns
Gate Drive Output Section
OUT High Saturation
IOUT = 0
0
0.3
V
IOUT = –10mA
0.7
1.5
V
IOUT = –100mA
1.5
2.5
V
OUT Low Saturation
IOUT = 10mA
0.1
0.4
V
IOUT = 100mA
1.5
2.2
V
Rise Time
TJ = 25°C, CLOAD = 1nF + 3.3 Ohms
30
80
ns
Fall Time
TJ = 25°C, CLOAD = 1nF + 3.3 Ohms
30
80
ns
Pulse Width Modulator Section
Maximum Duty Cycle
EAINV = 1.4V
92
96
%
Minimum Duty Cycle
EAINV = 1.6V
0
%
Modulator Gain
EAOUT = 1.5V to 2.5V
25
35
45
%/V
Undervoltage Lockout Section
Start Threshold
3.5
4.2
4.5
V
Hysteresis
100
200
300
mV


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