ETE –
SOL
– OB
High Voltage 1 REN Ring Generator
Ordering Information
Package Options
Device
HV421
8-Lead SO
HV421LG
HV421
Features
Processed with HVCMOS
®
technology
4.75V to 9.5V operating supply voltage
DC to AC conversion
1 REN load capacity
Adjustable ring frequency from 15Hz to 60Hz
Adjustable converter frequency
Enable/Disable function
General Description
The Supertex HV421 is a high voltage ring generator designed
to drive 1 North American REN (ringer equivalent number) from
a 5V source. The HV421 has an internal DC-DC converter which
converts the 5V DC supply to a nominal 68V DC connected to the
V
PP
pin. The DC-DC converter frequency of the HV421 is set by
an external resistor connected between R
SW
and V
DD
. The
ringing signal is generated by a high voltage H-bridge which
produces two square waves which are 180 degrees from each
other. The ringing frequency of the H-bridge is set by an external
resistor connected between R
RING
and V
DD
.
11
Absolute Maximum Ratings*
Supply Voltage, V
DD
Output Voltage, V
cs
Operating Temperature Range
Storage Temperature Range
SO-8 Power Dissipation
Note:
*All voltages are referenced to GND.
Pin Configuration
-0.5V to +10V
-0.5V to +120V
0°C to +85°C
-65°C to +150°C
400mW
ςΑ
V
DD
R
SW
V
PP
L
x
1
2
3
4
8
7
6
5
R
ring
Gate
Gate
GND
Top View
SO-8
11-1
SUPERTEX [ Supertex, Inc ]
