LM22670INVEVAL National Semiconductor, LM22670INVEVAL Datasheet - Page 5

• Manufacturer Part Number: LM22670INVEVAL
• Description: BOARD EVALUATION FOR LM22670INV
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r

Specifications of LM22670INVEVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: -5V
• Current - Output: 1.5A
• Voltage - Input: 5 ~ 35V
• Regulator Topology: Buck
• Frequency - Switching: 500kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM22670
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Other names: *LM22670INVEVAL

in the capacitance value of C6 and C7. Figure 7 shows the
stability of the LM22670INVEVAL evaluation board taken with
a 1.5A load current and a 12V input voltage. At input voltages
below 6V, the phase margin decreases significantly. To in-
crease the phase margin for applications using low input
voltages, select a higher capacitance value for C6 and C7. It
C1, C8
C6, C7
Ref #
TABLE 1. LM22670INVEVAL Bill of Materials for VOUT = -5V, Designed for 1.5A Output Current
C2
C3
C4
C5
D1
R1
R2
R3
U1
L1
120 µF 6.3V 24 mΩ ESR
22 µF 63V electrolytic
2.2 µF 50V ceramic
4.7 µF 50V ceramic
10 nF 50V ceramic
Not Populated
Not Populated
10 µH 4.09A
60V, 5A
2.55 kΩ
7.32 kΩ
Value
5
can be helpful to plot the loop transfer function by taking a
Bode plot using a network analyzer.
Application Note AN-1889 explains in detail how to take a
Bode plot measurement using only an oscilloscope and a
function generator.
National Semiconductor
Central Semiconductor
Nippon Chemi-Con
Vishay/Dale
Vishay/Dale
Panasonic
Supplier
Coilcraft
Wurth
TDK
TDK
TDK
-
-
APXE6R3ARA121ME61G
CRCW06032K55FKEA
CRCW06037K32FKEA
WE-PD L 74477110
C4532X7R1H475M
C3225X7R1H225K
C1608X7R1H103K
MSS1260-103MLD
LM22670MR-ADJ
EEEFK1J220XP
Part Number
CMSH5-60
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