LM2574HVN-ADJ/NOPB National Semiconductor, LM2574HVN-ADJ/NOPB Datasheet - Page 10
![IC REG SIMPLE SWITCHER 8-DIP](/photos/7/64/76415/lm2574hvn-adj_nopb_sml.jpg)
LM2574HVN-ADJ/NOPB
Manufacturer Part Number
LM2574HVN-ADJ/NOPB
Description
IC REG SIMPLE SWITCHER 8-DIP
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2574MX-ADJNOPB.pdf
(24 pages)
Specifications of LM2574HVN-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.23 ~ 57 V
Current - Output
500mA
Frequency - Switching
52kHz
Voltage - Input
4 ~ 60 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Power - Output
750mW
Primary Input Voltage
60V
No. Of Outputs
1
Output Voltage
57V
Output Current
500mA
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Supply Voltage Range
4V To 60V
Rohs Compliant
Yes
Input Voltage Primary Max
60V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM2574HVN-ADJ
*LM2574HVN-ADJ/NOPB
LM2574HVN-ADJ
*LM2574HVN-ADJ/NOPB
LM2574HVN-ADJ
www.national.com
Test Circuit and Layout Guidelines
C
C
D1 — Schottky, 11DQ06
L1 — 330 µH, 52627
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as pos-
sible. Single-point grounding (as indicated) or ground plane
construction should be used for best results. When using the
Adjustable version, physically locate the programming resis-
tors near the regulator, to keep the sensitive feedback wiring
short.
IN
OUT
— 22 µF, 75V
— 220 µF, 25V
Aluminum Electrolytic
Aluminum Electrolytic
(for 5V in, 3.3V out, use
100 µH, RL-1284-100)
Adjustable Output Voltage Version
Fixed Output Voltage Versions
FIGURE 2.
10
DS011394-11
DS011394-12