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FDS6670AS датащи(PDF) 11 Page - Richtek Technology Corporation

номер детали FDS6670AS
подробное описание детали  6A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

FDS6670AS датащи(HTML) 11 Page - Richtek Technology Corporation

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11
DS8298-01
November 2011
www.richtek.com
RT8298
Copyright
2011 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
©
Application Information
Output Voltage Setting
The resistive divider allows the FB pin to sense the output
voltage as shown in Figure 1.
Figure 1. Output Voltage Setting
The output voltage is set by an external resistive voltage
divider according to the following equation :
OUT
REF
R1
V
= V
1
R2
⎛⎞
+
⎜⎟
⎝⎠
Where VREF is the feedback reference voltage (0.808V
typ.).
External Bootstrap Diode
Connect a 1
μF low ESR ceramic capacitor between the
BOOT pin and SW pin. This capacitor provides the gate
driver voltage for the high side MOSFET.
It is recommended to add an external bootstrap diode
between an external 5V and BOOT pin for efficiency
improvement when input voltage is lower than 5.5V or duty
ratio is higher than 65% .The bootstrap diode can be a
low cost one such as IN4148 or BAT54. The external 5V
can be a 5V fixed input from system or a 5V output of the
RT8298. Note that the external boot voltage must be lower
than 5.5V.
Figure 2. External Bootstrap Diode
RT8298
GND
FB
R1
R2
VOUT
SW
BOOT
5V
RT8298
1µF
Chip Enable Operation
The EN pin is the chip enable input. Pulling the EN pin
low (<0.4V) will shutdown the device. During shutdown
mode, the RT8298 quiescent current drops to lower than
3
μA. Driving the EN pin high (2V < EN < 5.5V) will turn on
An external MOSFET can be added to implement digital
control on the EN pin, as shown in Figure 4. In this case,
a 100k
Ω pull-up resistor, REN, is connected between VIN
pin and the EN pin. MOSFET Q2 will be under logic control
to pull down the EN pin.
Figure 3. Enable Timing Control
Figure 4. Digital Enable Control Circuit
RT8298
EN
GND
100k
VIN
REN
Q2
EN
the device again. For external timing control, the EN pin
can also be externally pulled high by adding a REN resistor
and CEN capacitor from the VIN pin (see Figure 3).
The chip starts to operate when VIN rises to 4.2V (UVLO
threshold). During the VIN rising period, if an 8V output
voltage is set, VIN is lower than the VOUT target value and
it may cause the chip to shut down. To prevent this
situation, a resistive voltage divider can be placed between
the input voltage and ground and connected to the EN pin
to adjust enable threshold, as shown in Figure 5. For
example, the setting VOUT is 8V and VIN is from 0V to
12V, when VIN is higher than 10V, the chip is triggered to
enable the converter. Assume REN1 = 50k
Ω. Then,
Figure 5. Resistor Divider for Lockout Threshold Setting
RT8298
EN
GND
VIN
REN1
REN2
RT8298
EN
GND
VIN
REN
CEN
EN
EN1
EN_T
EN2
IN_S
EN_T
(R
x V
)
R
=
(V
V
)
where VEN_T is the enable comparator's logic-high reference
threshold voltage (1.7V) and VIN_S is the target turn on
input voltage (10V in this example). According to the
equation, the suggested resistor R EN2 is 10.2k
Ω.


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