LM2576_3A开关稳压器

Parameter Output Voltage LM2576-3.3
Sy mbol VO
Test C onditions IO = 0.5A 8V to VIN Rated
Min 3.23 3.20 3.14
Ty p 3.30
Max 3.37 3.40 3.47
U nits V
Output Voltage LM2576-5
POWER MANAGEMENT Description
The LM2575/6 series switching regulators are monolithic integrated circuits designed for use in buck or buck/ boost regulator applications requiring accurate output voltages over combined variations of line, load and temperature. This unique series greatly simplifies switching power supply design. The LM2575 has a maximum output current of 1A and the LM2576 is rated for 3A.
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VO
IO = 0.5A 8V to VIN Rated
4.90 4.85 4.75
5.00
5.10 5.15 5.25
V
Output Voltage LM2576-12
VO
IO = 0.5A 15V to VIN Rated
11.76 11.52 11.40
12.00
12.24 12.48 12.60
Parameter Output Voltage LM2575-3.3
Sy mbol VO
Test C onditions IO = 0.2A 8V to VIN Rated
Min 3.23 3.20 3.14
Ty p 3.30
Max 3.37 3.40 3.47
U nits V
Output Voltage LM2575-5
The LM2575/6 series offers an alternative to popular 3 terminal linear regulators by providing higher efficiency with reduced heatsink size. In many applications a heat sink will not be required.
IB
VIN = 12V, IO = 0.5A
50
100 500
nA
2
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LM2575 & LM2576
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
IIH IIL
VON/OFF = 5V (Off) VON/OFF = 0V (On)
Parameter Output Leakage C urrent(2) Output = 0V Output = -1V Qui escent C urrent(2)
Sy mbol
Test C onditions
Min
Ty p
Max
U nits
IL
VIN = VIN Rated 7.5
2 30 10 12
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Voltage On/Off Pi n Input Voltage Output Voltage to C ommon (Steady State) Power D i ssi pati on Thermal Resi stance Juncti on to Ambi ent TO-220 TO-263 Thermal Resi stance Juncti on to C ase TO-220 TO-263 Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 Sec. ESD Rati ng (Human Body Model) PD q JA Sy mbol VIN VON/OFF Maximum 45 -0.3 £ VON/OFF £ VIN -1 Internally Li mi ted 55 60 2.0 2.0 -40 to +125 -65 to +150 300 2 U nits V V V W °C /W
q JC TJ TSTG TLEAD V ESD
°C /W °C °C °C kV
Electrical Characteristics
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
V
Feedback Voltage LM2575-AD J, VO = 5V
V FB
IO = 0.2A 8V to VIN Rated
1.217 1.193 1.180
1.230
1.243 1.267 1.280
V
Feedback Bi as C urrent LM2575-AD J Effi ci ency/Opti on 3.3V 5V 12V A D J, V O = 5 V Swi tchi ng Frequency
DC ICL
Peak C urrent LM2576(1)
ICL
4.2 3.5
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3
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LM2575 & LM2576
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V; IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
IB
VIN = 12V, IO = 0.2A
50
100 500
nA
h
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
77 82
%
VIN = 15V, IO = 1A (LM2575, 3A for LM2576) VIN = 12V, IO = 1A (LM2575, 3A for LM2576) fSX 47 43
LM2575 & LM2576
u u u u The LM2575/6 series miniconverters include a u switching regulator and compensation network all within u the same package. Just add a choke, catch diode and u two capacitors to obtain an efficient DC-to-DC converter. u
VO
IO = 0.2A 8V to VIN Rated
4.90 4.85 4.75
5.00
5.10 5.15 5.25
V
Output Voltage LM2575-12
VO
IO = 0.2A 15V to VIN Rated
11.76 11.52 11.40
12.00
12.24 12.48 12.60
The current limit and thermal shutdown features of the LM2575/6 series fully protect the device against overstress conditions.
Applications
u u u u
Micro controller power supplies Medical equipment Industrial power supplies Instrumentation power supplies
Typical Application Circuits
LM2575 L1 D1 C IN C OUT 330µH 3A 68µF 330µF
LM2576 100µH 7A 120µF 1,000µF
Revision 1, January 2001
1
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LM2575 & LM2576
1A & 3A Miniconverter Switching Regulators
Features
u Pin for pin replacement for Nationals LM2575/6 u DC-to-DC buck or buck/boost converter requiring
only 4 support components Fixed or adjustable voltages Preset output voltages of 3.3V, 5V and 12V Wide output voltage range, 1.23V to 35V 82% typical efficiency @ 5V out Wide input voltage range, 4V to 40V Inhibit/enable control pin Industrial temperature range TO-220 and TO-263 packages series
V
Feedback Voltage LM2576-AD J, VO = 5V
V FB
IO = 0.5A 8V to VIN Rated
1.217 1.193 1.180
1.230
1.243 1.267 1.280
V
Feedback Bi as C urrent LM2576-AD J
ã 2001 Semtech Corp.
88 82 52 58 62 0.9 0.9 93 1.7 1.3 98 2.2 3.0 3.2 5.8 6.9 7.5 A 1.2 1.4 % A V kHz
Saturati on Voltage(1)
VSAT
LM2575, IO = 1A LM2576, IO = 3A
Max. D uty C ycle (On)(3) Peak C urrent LM2575(1)
mA
IQ
5
mA
Standby Qui escent C urrent (On/Off Pi n = 5V) On/Off Pi n Logi c Input Level
ISTBY
50 500
µA
VIH
2.2 2.4
1.4
V
VIL
1.2
1.0 0.8
V
On/Off Pi n Input C urrent