LM2650M-ADJ datasheet(9/11 Pages) NSC

部品番号	LM2650M-ADJ

部品情報	Synchronous Step-Down DC/DC Converter

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Application Circuits (Continued)

TABLE 1. Components for the Typical 90 kHz Application Circuit

Input Voltage

7V to 18V IN

Applicable Cell Stacks

8 to 12 Cell NiCd or NiMh, 3 to 4 Cell Li Ion, 8 to 11 Cell Alkaline, 6 Cell

Lead Acid

Output

5V, 3A Out

3.3V, 3A out

Input Capacitor C

IN

2 x 22 µF, 35V AVX TPS

Series or Sprague 593D Series

2 x 22 µF, 35V AVX TPS

Series or Sprague 593D Series

Inductor L1

40µH (See

Table 2)

33µH (See

Table 2)

Output Capacitor C

OUT

3x220 µF, 10V AVX TPS

Series or Sprague 593D Series

3x220 µF, 10V AVX TPS

Series or Sprague 593D Series

Feedback Resistors R1

and R2

R1 = 75k

Ω, 1%,

R2 = 24.9k

Ω, 1%,

R1 = 41.2k

Ω, 1%,

R2 = 24.9k

Ω, 1%,

Compensation

Components R

C,CC,R3,

and C

10

R

C = 37.4 kΩ,

C

C = 4.7 nF,

R

3 = 3.57 kΩ,

C

10 = 5.6 nF

R

C = 23.2 kΩ,

C

C = 8.2 nF,

R

3 = 2.0 kΩ,

C

10 =10 nF

Sleep Resistors R

SIA

and R

SOA

R

SIA =33 kΩ,

R

SOA = 200 kΩ

R

SIA =39 kΩ,

R

SOA = 130 kΩ

TABLE 2. Toroidal Inductors Using Cores from MICROMETALS, INC.

Core

Number

Core

Material

Wire

Gauge

Number of

Strands

Number of

Turns

15µH

T38

−52

AWG # 23

1

21

20µH

T38

−52

AWG # 23

1

25

33µH

T50

−52

AWG # 21

1

41

40µH

T50 (B)

−18

AWG # 21

1

41

MICROMETALS

5615 E. La Palma Ave. Anaheim, CA 92807 USA (800) 356-5977

TABLE 3. Components for Typical 200 kHz Applications

Input Voltage

7V to 18V IN

Applicable Cell Stacks

8 to 12 Cell NiCd or NiMh, 3 to 4 Cell Li Ion, 8 to 11 Cell Alkaline, 6 Cell

Lead Acid

Output

5V, 3A Out

3.3V, 3A out

Input Capacitor C

IN

2 x 22 µF, 35V AVX TPS

Series or Sprague 593D Series

2 x 22 µF, 35V AVX TPS

Series or Sprague 593D Series

Inductor L1

20µH (See

Table 2)

15µH (See

Table 2)

Output Capacitor C

OUT

3x220 µF, 10V AVX TPS

Series or Sprague 593D Series

3x220 µF, 10V AVX TPS

Series or Sprague 593D Series

Feedback Resistors R1

and R2

R1 = 75k

Ω, 1%,

R2 = 24.9k

Ω, 1%,

R1 = 41.2k

Ω, 1%,

R2 = 24.9k

Ω, 1%,

Compensation

Components R

C,CC,R3,

and C

10

R

C = 53.6 kΩ,

C

C = 2.7 nF,

R

3 = 4.02 kΩ,

C

10 = 4.7 nF

R

C = 33.2 kΩ,

C

C = 3.9 nF,

R

3 = 3.01 kΩ,

C

10 = 6.8 nF

Sleep Resistors R

SIA

and R

SOA

R

SIA =33 kΩ,

R

SOA = 200 kΩ

R

SIA =47 kΩ,

R

SOA =91 kΩ

Frequency Adjusting

Resistor R

FA

R

FA = 24.9 kΩ

R

FA = 24.9 kΩ

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