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LM2598SX-5.0 датащи(PDF) 6 Page - Texas Instruments

номер детали LM2598SX-5.0
подробное описание детали  SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator, With Features
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM2598SX-5.0 датащи(HTML) 6 Page - Texas Instruments

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LM2598
SNVS125D – MARCH 1998 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM2598
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
(1)
All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard
Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(2)
Typical numbers are at 25°C and represent the most likely norm.
(3)
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
When the LM2598 is used as shown in the Figure 42 and Figure 45, system performance is as shown in system parameters of Electrical
Characteristics.
7.8 Electrical Characteristics – Adjustable Voltage Version
Specifications are for TJ = 25°C, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN(1)
TYP(2)
MAX(1)
UNIT
SYSTEM PARAMETERS(3) (see Figure 42 and Figure 45 for test circuits)
VFB
Feedback voltage
4.5 V
≤ VIN ≤ 40 V, 0.1 A ≤ ILOAD ≤ 1 A
1.23
V
VOUT programmed for 3 V,
circuit of Figure 42 and
Figure 45
TJ = 25°C
1.193
1.267
Over full operating
temperature range
1.18
1.28
η
Efficiency
VIN = 12 V, VOUT = 3 V, ILOAD = 1 A
78%
(1)
All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard
Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(2)
Typical numbers are at 25°C and represent the most likely norm.
(3)
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the
severity of current overload.
(4)
No diode, inductor or capacitor connected to output pin.
(5)
Feedback pin removed from output and connected to 0 V to force the output transistor switch ON.
(6)
Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the Adjustable version, and 15 V for the 12-V version,
to force the output transistor switch OFF.
(7)
VIN = 40 V.
7.9 Electrical Characteristics – All Output Voltage Versions
Specifications are for TJ = 25°C unless otherwise noted. Unless otherwise specified, VIN = 12 V for the 3.3-V, 5-V, and
Adjustable version and VIN = 24 V for the 12-V version. ILOAD = 500 mA
PARAMETER
TEST CONDITIONS
MIN(1)
TYP(2)
MAX(1)
UNIT
DEVICE PARAMETERS
Ib
Feedback bias
current
Adjustable version only,
VFB = 1.3 V
TJ = 25°C
10
50
nA
Over full operating
temperature range
100
fO
Oscillator frequency
See(3)
TJ = 25°C
127
150
173
kHz
Over full operating
temperature range
110
173
VSAT
Saturation voltage
IOUT = 1 A
(4) (5)
TJ = 25°C
1
1.2
V
Over full operating
temperature range
1.3
DC
Max duty cycle (ON)
See(5)
100%
Minimum duty cycle
(OFF)
See(6)
0%
ICL
Current limit
Peak current(4)(5)
TJ = 25°C
1.2
1.5
2.4
A
Over full operating
temperature range
1.15
2.6
IL
Output leakage
current
Output = 0 V, see(4)(6)(7)
50
μA
Output = –1 V
2
15
mA
IQ
Operating quiescent
current
SD/SS pin open(6)
5
10
mA
ISTBY
Current standby
quiescent
SD/SS pin = 0 V(7)
TJ = 25°C
85
200
μA
Over full operating
temperature range
250


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