LM25010EVAL National Semiconductor, LM25010EVAL Datasheet - Page 3

• Manufacturer Part Number: LM25010EVAL
• Description: BOARD EVALUATION LM25010
• Manufacturer: National Semiconductor

Specifications of LM25010EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 1A
• Voltage - Input: 6 ~ 42V
• Regulator Topology: Buck
• Frequency - Switching: 200kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM25010
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Reducing Output Ripple
the V
the circuit is operated in current limit mode the ripple ranges
from )100 mVp-p to )300 mVp-p.
B) Ripple Reduction Option C: Connect the load to V
(leave R4 in). The ripple at this output varies from )3 mVp-p
to )10 mVp-p over the input voltage range. See Figure 6.
However, the load regulation is not as good at V
V
preferred for applications where the load current is relatively
constant.
Increasing the Current Limit
The evaluation board current limit activates at a load current
of )1.3A. If it is desired to increase the current limit for a
OUT1
C1, 2
C5, 6
R2, 3
Item
C10
C11
C3
C4
C7
C8
C9
D1
R1
R4
R5
R6
U1
L1
OUT1
due to the presence of R4. This alternative may be
ripple ranges from )40 mVp-p to )120 mVp-p. If
Switching Regulator
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Schottky Diode
Power Inductor
Description
Resistor
Resistor
Resistor
National Semiconductor LM25010MH
Cooper Bussmann DR125-101
TDK SLF12575T-101M1R9, or
ERJ-6RQFR68V (Panasonic)
FIGURE 3. Evaluation Board Schematic
(Continued)
TDK C3225X7R1H225M
TDK C2012X7R2A104M
TDK C2012X7R1C474M
TDK C2012X7R1C223M
TDK C3225X7R1C226M
TDK C2012X7R1C103M
Central Semi DFLS160
Mfg., Part Number
CRCW08052003F
CRCW08054991F
OUT2
Unpopulated
Unpopulated
Unpopulated
Unpopulated
Unpopulated
as at
OUT2
Bill of Materials
3
particular application, R5 must be added to the board. Refer
to the LM25010 data sheet to determine the appropriate
value for this resistor.
Minimum Load Current
The LM25010 requires a minimum load current of )500 µA
to ensure the boost capacitor (C6) is recharged sufficiently
during each off-time. In this evaluation board, the minimum
load current is provided by the feedback resistor (R2, R3),
allowing the board’s minimum load current at V
V
OUT2
) to be specified at zero.
12.5 mm x 12.5 mm
TSSOP - 14EP
Power DI123
Package
1210
0805
0805
0805
1210
0805
0805
0805
0805
0.022 µF, 16V
100 µH, 1.9A
0.1 µF, 100V
0.47 µF, 16V
0.01 µF, 16V
2.2 µF, 50V
22 µF, 16V
4.99 kΩ
60V,1A
200 kΩ
0.68 Ω
Value
www.national.com
20176007
OUT1
(or