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LTC3114-1 Datasheet(PDF) 13 Page - Analog Devices

No. de pieza LTC3114-1
Descripción Electrónicos  40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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LTC3114-1
13
Rev. D
For more information www.analog.com
OPERATION
Oscillator
The LTC3114-1 operates from an internal oscillator with
a nominal fixed frequency of 1.2MHz. This allows the
DC/DC converter efficiency to be maximized while still
using small external components.
Current Mode Control
The LTC3114-1 utilizes average current mode control for
the pulse width modulator as shown in Figure 2. Current
mode control, both average and the better known peak
method, enjoy some benefits compared to other control
methods including: simplified loop compensation, rapid
response to load transients and improved rejection of line
voltage transients.
Referring to Figure 2, an internal high gain transconduc-
tance error amplifier monitors VOUT through a voltage
divider connected to the FB pin and provides an output,
VC, that is used by the current mode control loop to com-
mand the appropriate inductor current level. To ensure
stability, external frequency compensation components
(CP1, CP2 and RZ) must be installed between VC and
ground. The procedure for determining these components
is provided in the Applications Information section of this
data sheet. VC is internally connected to the noninvert-
ing input of a high gain, integrating, operational amplifier,
referred to in Figure 2, as the average current amp. The
inverting input of the average current amplifier is con-
nected to the inductor current sense circuit through a gain
setting resistor (RCS1) and to its output (VIA) through
an internal frequency compensation network comprised
of RCS2, CCS1 and CCS2. The average current amplifier’s
output provides the cycle-by-cycle duty cycle command
into the buck-boost PWM circuitry.
PWM
A B C D
CONTROL
LOGIC
VIA
AVERAGE
CURRENT
AMP
VOLTAGE
ERROR
AMP
ACTIVE RANGE OF
VC = 135mV TO 1V
SOFT-START
1V
RCS1
CCS2
RCS2
CCS1
RZ
RBOT
RTOP
CP1
CP2
RCOESR
RLOAD
VOUT
COUT
RX
gm = 111µA/V
VIN
SWB
SWC
SWD PVOUT
SWA
RA
250m
VDS
SENSE
L1
VDS
SENSE
1V
gm = 120µS
RO = 3.6M
FB
VC
GND
31141 F02
gm
INDUCTOR
ISENSE
Figure 2. Average Current Mode Control Loop


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