LUCL9215AAU-D AGERE [Agere Systems], LUCL9215AAU-D Datasheet - Page 32

• Manufacturer Part Number: LUCL9215AAU-D
• Description: Short-Loop Sine Wave Ringing SLIC
• Manufacturer: AGERE [Agere Systems]

Short-Loop Sine Wave Ringing SLIC
Supervision
Power Ring
3.3 V V
A PWM signal was generated with an HP 8116 Func-
tion Generator modulated with a 20 Hz signal. The opti-
mal frequency used was 10 kHz. The PWM signal
amplitude was 3.10 V (0 V to 3.10 V). This input signal
is shown in Figure 17.
This produced 44.96 Vrms ringing signal on tip/ring
under open-loop conditions and 42.0 Vrms was deliv-
ered to 5 REN load. The ringing output on ring, with
V
Notes:
The modulating 20 Hz signal THD was measured at 1.3 %.
The tip/ring 20 Hz signal THD was measured at 1 %.
V
PWM input 10 kHz, 3.1 Vp-p.
R
Figure 18. Ringing Output on RING, with V
32
BAT1
1
CC
= 10 k , C
= 3.1 V is shown in Figure 18.
= –70.6 V, V
Figure 17. 3.3 V PWM Signal Amplitude
CC
Operation
1
= 0.22 F, C
BAT2
(continued)
(continued)
= –26.5 V, V
2
= 0.47 F.
CC
= 3.10 V.
CC
= 3.1 V
12-3571F
1660
During nonring modes, the PWM waveform may be left
on at RING
removed from tip and ring even if the low-voltage input
is still present at RING
sideration that should be made with respect to state
changes which are detailed in the Switching Behavior
of L9215 Ringing SLIC Application Note.
Square Wave Input Signal and Trapezoidal Power
Ring Signal Output
A low-voltage square wave signal may be used to pro-
vide the ringing input to RING
through a low-pass filter and ac-coupled into RING
shown in Figure 13 and Table 23. This approach gives
a trapezoidal wave output at tip and ring.
Using this approach, a trapezoidal waveform can be
achieved at tip and ring. This has the advantage of
increasing the power transfer to the load for a given
battery voltage, thus increasing the effective ringing
loop length as compared to a sine wave. The actual
crest factor achieved is a function of the magnitude of
the battery, the magnitude of the input voltage, fre-
quency, and R
Notes:
CH1 = CMOS Input (5 V) at RING
CH2 = Filtered input at RING
CH3 = Tip.
CH4 = Ring.
R
V
factor = 1.3.
Figure 19. Square Wave Input Signal and Trapezoi-
1
BAT1
CH1
CH2
CH3
CH4
= 14 k , C
= –70 V, Vrms = 51 V, V
1
IN
dal Power Ring Signal Output
= 1.0 F, C
. Via the state table, the ring signal will be
1
.
2
IN
= 0.47 F.
IN
p-p
. There are certain timing con-
.
= 67 V, frequency = 20 Hz, crest
IN
.
IN
. The signal is applied
September 2001
Agere Systems Inc.
12-3572F
IN
as