L9216B/H
High-Voltage Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
5 V V
CC
Operation
A PWM signal was generated with an
HP
™
8116
Function Generator modulated with a 20 Hz signal. The
optimal frequency used was 10 kHz. The PWM signal
amplitude was 5.0 V (0 V to 5 V). This signal is shown
in Figure 14.
Supervision
(continued)
Power Ring
(continued)
PWM Input Signal and Sine Wave Power Ring Sig-
nal Output
(continued)
Modulation waveforms showing PWM are in Figure 13
below.
12-3575F
Figure 14. 5 V PWM Signal Amplitude
12-3381(F)
A. Upper = Pwm Signal Centered at 10 kHz
Lower = Modulation Signal
This input produced 44.96 Vrms ringing signal on
tip/ring under open-loop conditions and 42.0 Vrms was
delivered to 5 REN load. The ringing output on ring,
with V
CC
= 5 V, is shown in Figure 15.
12-3380(F)
B. Same as A but Expanded
Figure 13. Modulation Waveforms
1660
Notes:
The modulating 20 Hz signal THD was measured at 1.3%.
The tip/ring 20 Hz signal THD was measured at 1%.
V
BAT1
= –70.6 V, V
BAT2
= –26.5 V, V
CC
= 5.019 V.
PWM input 10 kHz, 5.0 Vp-p.
R
1
= 10 kΩ, C
1
= 0.22
µF,
C
2
= 0.47
µF.
Figure 15. Ringing Output on RING, with V
CC
= 5 V
28
Agere Systems Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
