ELM92xxxx CMOS 600kHz High output current PWM step-up DC/DC converter
4. RON
ᎾᎰᎻᎪᎯᎰᎵᎮ፧ᎾᎨᎽᎬ፧ᎶᎭ፧᎓Ꮏ፧ᎷᎰᎵ
᎖
ᎊᎌ
᎙
ᎰᎵ
ᎳᎿ
᎓
ᎌ᎓᎔ᎀ፹ᎿᎿᎿᎿ
፸፷፻
Vlx=3V, R=30Ω
R • Von
*
*
᎖᎕
ᎎ᎕ᎋ
Ω
Ron=
Vlx-Von
5. Ilxl
6. Vceh, Vcel, Iceh, Icel
፺፺፷ᔵ
ᎈ
᎖
ᎊᎌ
፸፷፷ᔵ
᎖
᎓
ᎰᎵ
ᎰᎵ
᎓
ᎊᎌ
ᎌ᎓᎔ᎀ፹ᎿᎿᎿᎿ
ᎈ
ᎌ᎓᎔ᎀ፹ᎿᎿᎿᎿ
፸፷፻
፸፷፻
ᎪᎬ
Remarks) CE pin : ELM92xx2x series
■External parts
To design DC/DC converters using ELM92 series, coil, diode, and capacitor are necessary.
(Refer to the standard circuit configuration.)
1) Coil
When choosing choke coil, please select that whose core is not magnetically saturated, DC resistance is
low, and which has sufficient margin for rated current.
ELM recommends to use inductance around 2.2μH. It is possible that output voltage ripple form may reach
over 10mV when using high industance. If ripple can be ingored, it is possible to acquire high efficiency
with high industance.
The examples using 4.7μH are shown as follows.
15 - 8
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