Philips Semiconductors
High efficiency DC/DC converter
Preliminary specification
TEA1205AT
100
handbook, full pagewidth
efficiency
(%)
90
PFM
PWM
MGM699
80
70
60
50
40
10−1
1
10
102
IL (mA)
103
Using a Coilcraft DO3308P 10 µH inductor and a Sprague 595D 330 µF capacitor.
The dotted line represents the Pulse Frequency Modulation (PFM) and the solid line the Pulse Width Modulation (PWM).
Fig.6 Efficiency as a function of load current IL (2.4 to 3.3 V).
100
handbook, full pagewidth
efficiency
(%)
90
80
PFM
PWM
MGM700
70
60
50
40
10−1
1
10
102
IL (mA)
103
Using a Coilcraft DO3308P 10 µH inductor and a Sprague 595D 330 µF capacitor.
The dotted line represents the Pulse Frequency Modulation (PFM) and the solid line the Pulse Width Modulation (PWM).
Fig.7 Efficiency as a function of load current IL (3.6 to 5.5 V).
1998 Mar 24
10