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FAN5099 Arkusz danych(PDF) 10 Page - Fairchild Semiconductor

Numer części FAN5099
Szczegółowy opis  Wide Frequency Synchronous Buck PW & LDO Controller
Download  24 Pages
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5099 Arkusz danych(HTML) 10 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5099 Rev. 1.1.5
10
Block Diagram
Figure 21. Block Diagram
Detailed Operation Description
FAN5099 combines a high-efficiency, fixed-frequency
PWM controller designed for single-phase synchronous
buck Point-Of-Load converters with an integrated LDO
controller to support GTL-type loads. This controller is
ideally suited to deliver low-voltage, high-current power
supplies needed in desktop computers, notebooks,
workstations, and servers. The controller comes with an
integrated boot diode which helps reduce component
cost and increase space savings. With this controller, the
input to the power supply can be varied from 3V to 24V
and the output voltage can be set to regulate at 0.8V to
15V on the switcher output. The LDO output can be con-
figured to regulate between 0.8V to 3V and the input to
the LDO can be from 1.5V to 5V, respectively. An internal
shunt regulator at the VCC pin facilitates the controller
operation from either a 5V or 12V power source.
VCC Bias Supply
FAN5099 can be configured to operate from 5V or 12V
for VCC. When 5V supply is used for VCC, no resistor is
required to be connected between the supply and the
VCC. When the 12V supply is used, a resistor RVCC is
connected between the 12V supply and the VCC, as
shown in Figure 1. The internal shunt regulator at the VCC
pin is capable of sinking 150mA of current to ensure the
controller’s internal VCC is maintained at 5.6V maximum.
Choose a resistor such that:
It is rated to handle the power dissipation.
Current sunk within the controller is minimized to
prevent IC temperature rise.
RVCC Selection (IC)
The selection of RVCC is dependent on:
Variation of the 12V supply
Sum of gate charges of top and bottom FETs (QFET)
Switching frequency (fSW)
Shunt regulator minimum current (1mA)
Quiescent Current of the IC (IQ)
Calculate RVCC based on the minimum input voltage for
the VCC:
(EQ. 1)
For a typical example, where:
VINMIN = 11.5V, IQ = 3mA, QFET = 30nC, fSW = 300kHz,
RVCC is calculated to be 398.65Ω.
PWM Section
The FAN5099’s PWM controller combines the conven-
tional voltage mode control and current sensing through
lower MOSFET RDS_ON to generate the PWM signals.
This method of current sensing is loss-less and cost
effective. For more accurate current sense requirements,
an optional external resistor can be connected with the
bottom MOSFET in series.
Current
Sense
Amplifier
FB
COMP
SS
Vref
Vcc
ILIM
R
ILIM
10μA
10μA
Current Limit
Comparator
Internal
Boot Diode
Internal Vcc 5.6V Max.
OSC
R
S
Q
PW M
EN
R(RAMP)
Ramp
Generator
Enable
Vcc
C
O
L
O
BOOT
Vout
R
RAMP
Error
Amplifier
PWM
Comparator
C
BOOT
V
IN
V
IN
Shunt Reg
HDRV
SW
LDRV
PGND
Summing
Amplifier
Adaptive
Gate Drive
Circuit
R
VCC
VIN
MIN
5.6
I
Q
110
3
Q
FET
f
SW
1.2
++
()
----------------------------------------------------------------------------------------
=


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