LM25007_08 NSC [National Semiconductor], LM25007_08 Datasheet - Page 10

• Manufacturer Part Number: LM25007_08
• Description: 42V, 0.5A Step-Down Switching Regulator
• Manufacturer: NSC [National Semiconductor]

www.national.com
shoot. The reverse voltage rating of the re-circulating diode
must be greater than the maximum line input voltage.
Thermal Protection
Internal Thermal Shutdown circuitry is provided to protect the
integrated circuit in the event the maximum junction temper-
ature is exceeded. When thermal protection is activated,
typically at 165 degrees Celsius, the controller is forced into
a low power reset state, disabling the output driver. This fea-
ture is provided to prevent catastrophic failures from acciden-
tal device overheating.
10V, 400mA Demo Board Bill of Materials (See Typical Application Circuit)
ITEM
C1
C2
C3
C4
C5
D1
R1
R2
R3
R4
R5
U1
L1
SLF7045T-101MR60-1
C3216X7R2A104KT
C4532X7R2A105M
C4532X7R1E156M
C1206C104K5RAC
C1206C103K5RAC
CRCW12061R00F
CRCW12062003F
CRCW12061003F
CRCW12063011F
CRCW12061001F
PART NUMBER
MURA110T3
LM25007
10
CAPACITOR, CER, KEMET
CAPACITOR, CER, KEMET
REGULATOR, NATIONAL
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
DIODE, 100V, ON SEMI
BUCK INDUCTOR, TDK
Minimum Load Current
A minimum load current of 1 mA is required to maintain proper
operation. If the load current falls below that level, the boot-
strap capacitor may discharge during the long off-time, and
the circuit will either shutdown, or cycle on and off at a low
frequency. If the load current is expected to drop below 1 mA
in the application, the feedback resistors should be chosen
low enough in value so they provide the minimum required
current at nominal Vout.
DESCRIPTION
RESISTOR
RESISTOR
RESISTOR
RESISTOR
RESISTOR
0.01µ, 50V
0.1µ, 100V
0.1µ, 50V
1µ, 100V
15µ, 25V
VALUE
100µH
3.01K
200K
100K
1K
1