AT5802
Preliminary
4-Channel driver + Power Controller
Application explanation
1. DC/DC converter
To set the output voltage, use the following R1 and R2.
VSYS
=
0.9
×
R
1
+
R
2
R
2
2. Booster circuit for driving the Power-Mos
This circuit can generate a power source VG necessary for driving the built-in Power-Mos
transistor. Oscillation frequency of LG terminal is independent and different from that of the main
DC/DC converter.
When system start-up, this circuit activates at first.
3. Down voltage regulator circuit
The DC_IN is the power source of regulator circuit. If PNP transistor is externally attached, it
allows the regulator circuit with the REGO set as the output voltage. Output voltage is 3.2V, this
regulator output voltage depends on the built-in resistance. This circuit unable to control ON/OFF.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
9
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
