MAX610 MAXIM [Maxim Integrated Products], MAX610 Datasheet - Page 4

• Manufacturer Part Number: MAX610
• Description: AC-to-DC Regulator(110/220VAC to 5.0VDC)
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 3 shows a 50mA, 5V power supply using the full-
wave MAX610. Typical component values for both
110VAC and 220VAC 50/60Hz operation are shown.
The output of this power supply is NOT ISOLATED
from the power line: the MAX610 and any equipment
powered by the MAX610 must be enclosed to avoid
shock hazards. To avoid a second potential shock
hazard, include the 1MΩ resistor across C1. This resis-
tor will discharge the voltage left on C1 when the
110/220VAC is disconnected.
Figure 4 shows a 50mA, 5V power supply using the half-
wave MAX611. The circuit differs from Figure 3 in that
the 5V output is referenced to one side of the 110VAC
power line. This circuit is generally preferred for sys-
tems that control triacs, where it is desirable to connect
V- to the power line. Note that for a given amount of out-
put current, the value of C1 must be twice the value
used in the full-wave circuit of Figure 3. As with all
MAX610 family circuits that do not use a transformer to
isolate the circuit, this circuit is NOT ISOLATED from
the power line.
For output currents of less than 10mA, capacitor C1 of
Figure 3 can be omitted, resulting in the circuit shown
in Figure 5. The available output current is determined
by the value of R1. For example, with R1 = 8.2kΩ, the
available output current is 10mA, while the power dissi-
pation in R1 is 1.3W. Double both the resistance value
and the wattage rating of R1 for use with a 220VAC
input.
AC-to-DC Regulator
(110/220VAC to 5.0VDC)
Figure 1. MAX610/MAX612 Block Diagram
4
_______________Typical Applications
_____________________________________________________________Block Diagrams
_______________________________________________________________________________________
AC1
AC2
V+
V-
Minimum-Component-Count 10mA,
* 12.4V ZENER IN MAX610
18.6V ZENER IN MAX612
Simple Line-Powered 5V Supply
Half-Wave Rectification
*
OVER/UNDER
REGULATOR
DETECTOR
VOLTAGE
SERIES
110/220VAC to 5V,
5V Power Supply
OUV
V
V
V
OUT
SENSE
SET
If isolation from the power line is required, use the
MAX612 in the circuit of Figure 6. The MAX612 must
have an input voltage of at least 8V peak to maintain a
regulated 5V output, but the peak transformer output
voltage must not exceed 17V unless the current is limit-
ed as shown in Figures 3 and 4. The AC input line volt-
age can range from 80V
8V
The MAX612 power dissipation is approximately
(V
shown, the power dissipated in the MAX612 limits the
maximum output current to 60mA at +25°C ambient
and 30mA at +70°C.
Resistor R1 limits the peak input current, but is not
needed if the transformer impedance limits the peak
current to a suitable value. As a rule of thumb, R1 can
be omitted if the short-circuit output current of the
transformer is less than 2A.
Figure 2. MAX611 Block Diagram
Figure 3. Simple Line-Powered 5V Supply
AC1
IN(peak)
* FOR 220VAC, 50Hz INPUT:
* FOR 220VAC, 60Hz INPUT:
V+
RMS
V-
117VAC
R1 = 100 , 1W
C1 = 1 F, 280V
R1 = 100 , 1W
C1 = 0.82 F, 280V
60Hz
Transformer-Isolated 5V Power Supply
1/2W
47
R1*
nominal transformer voltage shown.
- V
RMS
150V
OUT
1.5 F
C1*
1M
RMS
RMS
) x I
7
1
12.4V
ZENER
LOAD
AC1
AC2
V
SET
4
. With the 8V
MAX610
OVER/UNDER
REGULATOR
AND DELAY
RMS
DETECTOR
VOLTAGE
SERIES
V-
2
16VDC
47 F
C2
to 160V
V
SENSE
V
V+
OUV
OUT
8
RMS
6
5
3
RMS
transformer
RESET DELAY
OUV
V
V
OUT
SENSE
+5V
REGULATED
DC
TO P
RESET
+12VDC
with the