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1.2MHz Low-Cost,
High-Performance Chargers
BDIV
OVP
SET POINT + 100mV
CSI
IMAX
11A
CCMP
LVC
IMIN
1A
ZCMP
1A
CSSP
OFF-TIME
COMPUTE
CSIN
Figure 6. DC-DC Converter Functional Diagram
R
S
OFF-TIME
ONE SHOT
Q
Q
DH DRIVER
DL DRIVER
The operation of the DC-to-DC controller is determined
by the following five comparators as shown in the func-
tional diagram in Figures 2 and 6:
? The IMIN comparator triggers a pulse in discontinu-
ous mode when the accumulated error is too high.
IMIN compares the control signal (LVC) against
10mV (referred at V CSIP - V CSIN ). When LVC is less
than this threshold, DHI and DLO are both forced
low. Indirectly, IMIN sets the peak inductor current
in discontinuous mode.
The high-side MOSFET on-time is terminated when
the current-sense signal exceeds 11A. A new cycle
cannot start until the IMAX comparator ’s output
goes low.
? The ZCMP comparator provides zero-crossing detec-
tion during discontinuous conduction. ZCMP com-
pares the current-sense feedback signal to 1A (RS2
= 10m Ω ). When the inductor current is lower than
the 1A threshold, the comparator output is high,
and DLO is turned off.
?
?
The CCMP comparator is used for current-mode
regulation in continuous-conduction mode. CCMP
compares LVC against the inductor current. The
high-side MOSFET on-time is terminated when the
CSI voltage is higher than LVC.
The IMAX comparator provides a secondary cycle-
by-cycle current limit. IMAX compares CSI to
110mV (corresponding to 11A when RS2 = 10m Ω ).
?
The OVP comparator is used to prevent overvoltage
at the output due to battery removal. OVP com-
pares BATT against the VCTL. When BATT is
100mV/cell above the set value, the OVP compara-
tor output goes high, and the high-side MOSFET
on-time is terminated. DHI and DLO remain off until
the OVP condition is removed.
______________________________________________________________________________________
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