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參數資料
| 型號： | L9215A |
| 英文描述： | CAP CER 2200PF 3.15KVDC R3 RAD |
| 中文描述： | 短回路正弦波振鈴用戶接口 |
| 文件頁數： | 32/50頁 |
| 文件大小： | 1115K |
| 代理商： | L9215A |
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Data Sheet
September 2001
Short-Loop Sine Wave Ringing SLIC
L9215A/G
32
Agere Systems Inc.
Supervision
(continued)
Power Ring
(continued)
3.3 V V
CC
Operation
A PWM signal was generated with an HP8116 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.
12-3571F
Figure 17. 3.3 V PWM Signal Amplitude
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
CC
= 3.1 V is shown in Figure 18.
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
= 3.10 V.
PWM input 10 kHz, 3.1 Vp-p.
R
1
= 10 k
, C
1
= 0.22
μ
F, C
2
= 0.47
μ
F.
Figure 18. Ringing Output on RING, with V
CC
= 3.1 V
During nonring modes, the PWM waveform may be left
on at RING
IN
. Via the state table, the ring signal will be
removed from tip and ring even if the low-voltage input
is still present at RING
IN
. There are certain timing con-
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
IN
. The signal is applied
through a low-pass filter and ac-coupled into RING
IN
as
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
1
.
12-3572F
Notes:
CH1 = CMOS Input (5 V) at RING
IN
.
CH2 = Filtered input at RING
IN
.
CH3 = Tip.
CH4 = Ring.
R
1
= 14 k
, C
1
= 1.0
μ
F, C
2
= 0.47
μ
F.
V
BAT1
= –70 V, Vrms
= 51 V, V
p-p
= 67 V, frequency = 20 Hz, crest
factor = 1.3.
Figure 19. Square Wave Input Signal and Trapezoi-
dal Power Ring Signal Output
CH1
CH2
CH3
CH4
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