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LM2596T-3.3 Arkusz danych(PDF) 4 Page - Texas Instruments

Numer części LM2596T-3.3
Szczegółowy opis  LM2596 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator
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Strona internetowa  http://www.ti.com
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LM2596T-3.3 Arkusz danych(HTML) 4 Page - Texas Instruments

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LM2596
SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
www.ti.com
LM2596-ADJ Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range
LM2596-ADJ
Units
Symbol
Parameter
Conditions
Typ
Limit
(Limits)
(1)
(2)
SYSTEM PARAMETERS (3) Test Circuit Figure 20
VFB
Feedback Voltage
4.5V
≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A
1.230
V
VOUT programmed for 3V. Circuit of Figure 20
1.193/1.180
V(min)
1.267/1.280
V(max)
η
Efficiency
VIN = 12V, VOUT = 3V, ILOAD = 3A
73
%
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3)
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2596 is used as shown in the Figure 20 test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the
12V version. ILOAD = 500 mA
LM2596-XX
Units
Symbol
Parameter
Conditions
Typ
Limit
(Limits)
(1)
(2)
DEVICE PARAMETERS
Ib
Feedback Bias Current
Adjustable Version Only, VFB = 1.3V
10
nA
50/100
nA (max)
fO
Oscillator Frequency
See (3)
150
kHz
127/110
kHz(min)
173/173
kHz(max)
VSAT
Saturation Voltage
IOUT = 3A
(4) (5)
1.16
V
1.4/1.5
V(max)
DC
Max Duty Cycle (ON)
See (5)
100
%
Min Duty Cycle (OFF)
See (6)
0
ICL
Current Limit
Peak Current (4)(5)
4.5
A
3.6/3.4
A(min)
6.9/7.5
A(max)
IL
Output Leakage Current
Output = 0V (4)(6)
50
μA(max)
Output =
−1V (7)
2
mA
30
mA(max)
IQ
Quiescent Current
See (6)
5
mA
10
mA(max)
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3)
The switching frequency is reduced when the second stage current limit is activated.
(4)
No diode, inductor or capacitor connected to output pin.
(5)
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
(6)
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force
the output transistor switch OFF.
(7)
VIN = 40V.
4
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