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LM2597HVN-12 Folha de dados(PDF) 6 Page - Texas Instruments

Nome de Peças LM2597HVN-12
Descrição Electrónicos  LM2597/LM2597HV SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down
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LM2597, LM2597HV
SNVS119C – MARCH 1998 – REVISED APRIL 2013
www.ti.com
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 = 100 mA.
Symbol
Parameter
Conditions
LM2597/LM2597HV-XX
Units
(Limits)
Typ (1)
Limit (2)
DEVICE PARAMETERS
Ib
Feedback Bias Current
Adjustable Version Only, VFB = 1.235V
10
50/100
nA
fO
Oscillator Frequency
See (3)
150
kHz
127/110
kHz(min)
173/173
kHz(max)
VSAT
Saturation Voltage
IOUT = 0.5A
(4) (5)
0.9
V
1.1/1.2
V(max)
DC
Max Duty Cycle (ON)
See (5)
100
%
Min Duty Cycle (OFF)
See (6)
0
ICL
Current Limit
Peak Current (4)(5)
0.8
A
0.65/0.58
A(min)
1.3/1.4
A(max)
IL
Output Leakage Current
Output = 0V (4)(6)(7)
50
μA(max)
Output =
−1V
2
mA
15
mA(max)
IQ
Operating Quiescent
SD /SS Pin Open, VBS Pin Open
(6)
5
mA
Current
10
mA(max)
ISTBY
Standby Quiescent
SD /SS pin = 0V (6) LM2597
85
μA
Current
200/250
μA(max)
LM2597HV
140
250/300
μA(max)
θJA
Thermal Resistance
P Package, Junction to Ambient (8)
95
°C/W
D Package, Junction to Ambient (8)
150
SHUTDOWN/SOFT-START CONTROL Test Circuit of Figure 31
VSD
Shutdown Threshold
1.3
V
Voltage
Low, (Shutdown Mode)
0.6
V(max)
High, (Soft-start Mode)
2
V(min)
VSS
Soft-start Voltage
VOUT = 20% of Nominal Output Voltage
2
V
VOUT = 100% of Nominal Output Voltage
3
ISD
Shutdown Current
VSHUTDOWN = 0.5V
5
μA
10
μA(max)
ISS
Soft-start Current
VSoft-start = 2.5V
1.6
μA
5
μA(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 specified 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. 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 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 for the LM2597 and 60V for the LM2597HV.
(8)
Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional
copper area will lower thermal resistance further. See application hints in this data sheet and the thermal model in Switchers Made
Simple software.
6
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