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參數(shù)資料
| 型號： | LTC4000EUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 26/40頁 |
| 文件大?。?/td> | 428K |
| 代理商： | LTC4000EUFD#TRPBF |
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LTC4000
32
4000f
The Output Voltage Regulation Loop
The feedback signal for the output voltage regulation loop
is the voltage on the OFB pin, which is connected to the
center node of the resistor divider between the output
voltage (connected to CSP) and the FBG pin. This voltage
is compared to an internal reference (1.193V typical) by
the transconductance error amplifier A7. This amplifier
then drives the output transconductance amplifier (A10)
to appropriately adjust the voltage on the ITH pin driving
the external DC/DC converter to regulate the output volt-
age observed by the OFB pin. This loop is shown in detail
in Figure 21.
Figure 21. Simplified Linear Model of the Output Voltage
Regulation Loop
Figure 22. Simplified Linear Model of the Battery Float
Voltage Regulation Loop
The simplified loop transmission is as follows:
LOV(s) = gm7
RC –
1
gm10
CCs + 1
CCs
ROFB2
ROFB
RL
RL CLs + 1
Gmop(s)
where Gmop(s) is the transfer function from VITH to
the output current of the external DC/DC converter, and
ROFB = ROFB1 + ROFB2.
applicaTions inForMaTion
The Battery Float Voltage Regulation Loop
The battery float voltage regulation loop is very similar to
the output float voltage regulation loop. Instead of observ-
ing the voltage at the OFB pin, the battery float voltage
regulation loop observes the voltage at the BFB pin.
One significant difference is that while the value of RL
in the output voltage loop can vary significantly, the
output resistance of the battery float voltage loop is a
small constant value approximately equal to the sum
of the on-resistance of the external PFET (RDS(ON)) and
the series internal resistance of the battery (RBAT). This
approximation is valid for any efficient system such that
most of the output power from the battery is delivered to
the system load and not dissipated on the battery inter-
nal resistance or the charging PFET on-resistance. For a
typical system, minimum RL is at least five times larger
than RDS(ON) + RBAT and RBFB is at least 106 times larger
than RBAT. Figure 22 shows the detail of the battery float
voltage regulation loop.
CC
A7
gm6 = 0.5m
A10
gm10 = 0.1m
ITH
INPUT
BAT
INTERNALLY
PULLED HIGH
BFB
LTC4000
FBG
+
–
+
CC
4000 F22
RC
1.136V
RBFB1
Gmop(s)
RBFB2
RO6
RO10
CL
RL
+
–
RBAT
RDS(ON)
RCS
LOAD
CC
A7
gm7 = 0.5m
A10
gm10 = 0.1m
ITH
INPUT
LOAD
CSP
INTERNALLY
PULLED HIGH
OFB
LTC4000
FBG
+
–
+
CC
4000 F21
RC
1.193V
ROFB1
Gmop(s)
ROFB2
RO7
RO10
CL
RL
+
–
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