Epson Power Supply S1F70000 - Manual (Page 161)

S1F76300 Series
4–16 EPSON
S1F70000 Series
Technical Manual
Inductor
Use an inductor with low direct-current resistance and
low losses.
Leadless
Pre-wound, leadless inductors using surface-mount
technology are the most suitable for portable equipment
and other space-critical applications.
Drum coil
Avoid using drum coils because their magnetic field
can induce noise.
Toroidal coil
Use a toroidal coil to virtually eliminate magnetic field
leakage, reduce losses and improve performance.
Diode
Use a Schottky barrier diode with a high switching
speed and low forward voltage drop, V
F .
Capacitor
To minimize ripple voltages, use a capacitor with a
small equivalent direct-current resistance for smooth-
ing.
Notes
■ 100
µ
H
≤
L
≤
1mH, C
≤
10
µ
F, D = Schottky diode
■ S1F76310M1A0
• Peff = 70% when L = 220
µ
H (leadless inductor),
V I1 = 1.5V, f
CLK = 32kHz, I O = 4mA
• Peff = 75% when L = 220
µ
H (drum coil),
V I1 = 1.5V, f
CLK = 32kHz, I O = 6mA
• Peff = 80% when L = 300
µ
H (toroidal coil),
V I1 = 1.5V, f
CLK = 32kHz, I O = 7mA
■ S1F76310M1B0
• Peff = 70% when L = 220
µ
H (leadless inductor),
V I1 = 1.5V, f
CLK = 32kHz, I O = 8mA
• Peff = 75% when L = 220
µ
H (drum coil),
V I1 =1.5V, f
CLK = 32kHz, I O = 9mA
• Peff = 80% when L = 300
µ
H (toroidal coil),
V I1 = 1.5V, f
CLK = 32kHz, I O = 10mA
External components
The performance characteristics of switching regulators
depend greatly on the choice of external components.
Observing the following guidelines will ensure high
performance and maximum efficiency.