N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 61

• Manufacturer Part Number: N681622YG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The Figure below illustrates how voltage regulation occurs in the Forward Active state.
The values for V
constant voltage region the V
attempts to exceed I
but the V
will continue below V
implemented in the Reverse Active state.
During the Ringing state, the V
fixed value of V
load is applied. As an alternative the N681386/87 allows a dynamic battery target to be selected by setting the
LCTHY:DBTR[7] address (0x54). In this case V
dissipation and improving efficiency during Ringing. Dynamic Battery Target is available only for DC/DC conversion
architecture.
Preliminary Datasheet Rev1.0
V
BATH
V
V
V
OH
BATH
BATL
BATL
0V
/2
Volts
is adjusted to track the R
0V
0V
V
V
BATH
GM
. However, the discrete linefeed circuit dissipates significant power particularly when a large REN
, V
LIM
V
BATL
V
V
V
TIP
TIP
TIP
RING
OH
the constant current region is entered. In this case the values for V
VOV:TR=0
. Otherwise, tracking will stop and V
and V
BAT
BAT
OV
Figure 21: Voltage Tracking in Forward Active State
is simply the sum of these three settings (V
must be increased to accommodate the ring signal. Conventionally V
are set in VCMR, OHV, and VOV registers respectively. When operating in the
LOOP
, which adjusts V
Figure 22: Dynamic Battery Target
V
V
Constant I
Constant I
OV
OV
Region
Region
BAT
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will dynamically track the actual ring signal, minimizing the power
BAT
BAT
V
V
accordingly. If tracking is enabled, VOV:TR=1, tracking
I
I
LIM
LIM
OH
OH
Single Programmable Extended Codec/SLCC
will not go lower than V
V
V
V
V
V
V
V
GM
GM
OV
OV
TIP
TIP
TIP
V
V
RING
BATH
|V
|V
Constant V
Constant V
TIP
TIP
Region
Region
GM
– V
– V
+ V
RING
RING
OH
|
|
BATL
+ V
OV
. A similar mechanism is
N681386/87
OV
and V
). If the Loop current
V
V
OH
OH
CIVR-v4
CIVR-v4
GM
DC
DC
Ring
Ring
time
V
V
V
V
are maintained
January 2010
R
R
V
V
RING
RING
BAT
BAT
TIP
TIP
BAT
LOOP
LOOP
is set to a