LM3409QHV National Semiconductor, LM3409QHV Datasheet - Page 23

• Manufacturer Part Number: LM3409QHV
• Description: PFET Buck Controller
• Manufacturer: National Semiconductor

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8. INPUT UVLO
Solve for R
The closest 1% tolerance resistor is 49.9 kΩ therefore V
is:
Solve for R
Design #2 Bill of Materials
Qty
1
2
1
1
1
1
1
1
1
1
1
1
1
1
UV2
UV1
LM3409/LM3409Q
:
:
Part ID
C
R
R
R
R
C
C
R
C
Q1
D1
C
L1
SNS
OFF
OFF
UV1
UV2
IN1
F2
F2
O
F
470pF X7R 10% 50V
4.7µF X7R 10% 50V
1.0µF X7R 10% 16V
0.1µF X7R 10% 16V
2.2µF X7R 10% 50V
PMOS 70V 5.7A
Schottky 60V 5A
22 µH 20% 4.2A
Buck controller
0.2Ω 1% 1W
15.4kΩ 1%
6.98kΩ 1%
49.9kΩ 1%
Part Value
1.0kΩ 1%
HYS
23
The closest 1% tolerance resistor is 6.98 kΩ therefore V
ON
The chosen components from step 8 are:
9. IADJ CONNECTION METHOD
The IADJ pin is connected to an external voltage source and
varied from 0 – 1.24V to dim. An RC filter (R
C
10. PWM DIMMING METHOD
No PWM dimming is necessary.
F2
is:
= 0.1µF) is used as recommended.
Manufacturer
COMCHIP
MURATA
MURATA
VISHAY
VISHAY
VISHAY
VISHAY
VISHAY
ZETEX
NSC
TDK
TDK
TDK
TDK
GRM55ER71H475MA01L
GRM43ER71H225MA01L
LM3409MY/LM3409QMY
CRCW06031K00FKEA
CRCW060315K4FKEA
CRCW06036K98FKEA
CRCW060349K9FKEA
SLF12575T-220M4R0
WSL2512R2000FEA
C1608X7R1C105K
C1608X7R1C104K
C1608X7R1H471K
ZXMP7A17KTC
Part Number
CDBC560-G
F2
www.national.com
= 1 kΩ and
TURN-