LM2576T-ADJG ON Semiconductor, LM2576T-ADJG Datasheet - Page 8

• Manufacturer Part Number: LM2576T-ADJG
• Description: IC REG SW 3A ADJ STEPDWN TO220-5
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM2576T-ADJG

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.23 ~ 37 V
• Current - Output: 3A
• Frequency - Switching: 52kHz
• Voltage - Input: 7 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Straight Leads)
• Output Voltage: 1.23 V to 37 V
• Output Current: 3 A
• Input Voltage: 4.75 V to 40 V
• Switching Frequency: 52 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: Through Hole
• Duty Cycle (max): 98 %
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• No. Of Pins: 5
• Filter Terminals: Through Hole
• Rohs Compliant: Yes
• Dc: 0739
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: LM2576T-ADJGOS

circuit board is very important. Rapidly switching currents
associated with wiring inductance, stray capacitance and
parasitic inductance of the printed circuit board traces can
generate
electromagnetic interferences (EMI) and affect the desired
operation. As indicated in the Figure 15, to minimize
inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as possible.
ground plane construction should be used.
As in any switching regulator, the layout of the printed
For best results, single−point grounding (as indicated) or
voltage
7.0 V − 40 V
Unregulated
DC Input
7.0 V − 40 V
Unregulated
transients
DC Input
C
100 mF
in
which
V
C
100 mF
in
1
in
3
V
in
1
Adjustable
C
C
D1
L1
R1
R2
can
Adjustable Output Voltage Versions
GN
D
LM2576
in
out
PCB LAYOUT GUIDELINES
3
Fixed Output Voltage Versions
Figure 15. Typical Test Circuit
Fixed Output
−
−
−
−
−
−
GN
D
LM2576
generate
100 mF, 75 V, Aluminium Electrolytic
1000 mF, 25 V, Aluminium Electrolytic
Schottky, MBR360
100 mH, Pulse Eng. PE−92108
2.0 k, 0.1%
6.12 k, 0.1%
5
http://onsemi.com
V out + V
R2 + R1
Where V
between 1.0 k and 5.0 k
ON/OFF
5
LM2576
2
4
Output
Feedback
ref
ON/OFF
ref
8
= 1.23 V, R1
V out
V ref
2
4
Feedback
Output
1.0 ) R2
(emitter of the internal switch) of the LM2576 should be
kept to a minimum in order to minimize coupling to sensitive
circuitry.
important to keep the sensitive feedback wiring short. To
assure this, physically locate the programming resistors near
to the regulator, when using the adjustable version of the
LM2576 regulator.
– 1.0
On the other hand, the PCB area connected to the Pin 2
Another sensitive part of the circuit is the feedback. It is
100 mH
D1
MBR360
R1
L1
100 mH
D1
MBR360
L1
C
1000 mF
out
C
1000 mF
out
R2
R1
Load
V
out
5,000 V
Load
V
out