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PDF XR79206 Data sheet ( Hoja de datos )

Número de pieza XR79206
Descripción 6A Synchronous Step-Down COT Power Module
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XR79206
40V, 6A Synchronous Step-Down
COT Power Module
Description
The XR79206 is part of a family of 40V synchronous step-down
power modules combining the controller, drivers, inductor, passive
components and MOSFETs in a single package for point-of-load
supplies. This module requires very few external components leading
to ease of design and fast time to market. The XR79206 has load
current rating of 6A. A wide 5V to 40V input voltage range allows for
single supply operation from industry standard 24V ±10%, 18V to 36V
and rectified 18VAC and 24VAC rails.
With a proprietary emulated current mode Constant On-Time (COT)
control scheme, the XR79206 provides extremely fast line and load
transient response using ceramic output capacitors. It requires no
loop compensation, simplifying circuit implementation and reducing
overall component count. The control loop also provides 0.2% load
and 0.1% line regulation and maintains constant operating frequency.
A selectable power saving mode, allows the user to operate in
Discontinuous Current Mode (DCM) at light current loads significantly
increasing the converter efficiency.
A host of protection features, including overcurrent, over temperature,
short-circuit and UVLO, help achieve safe operation under abnormal
operating conditions.
The XR79206 is available in a RoHS-compliant, green/halogen-free
space-saving 10mm x 10mm x 4mm QFN package.
Typical Application
FEATURES
■■ 6A step-down power module
5V to 40V wide single input voltage
≥0.6V adjustable output voltage
■■ Controller, drivers, inductor, passive
components and MOSFETs integrated in
one package
■■ Proprietary constant on-time control
No loop compensation required
Stable with ceramic output capacitors
Programmable 100ns to 1µs on-time
Constant 400kHz to 800kHz frequency
Selectable CCM or DCM/CCM
operation
■■ Precision enable and power-good flag
■■ Programmable soft-start
■■ 10mm x 10mm x 4mm QFN package
APPLICATIONS
■■ Drones and remote vehicles
■■ Automotive displays
■■ FPGA/DSP/processor supplies
■■ Industrial control and automation
■■ Telecommunications and infrastructure
equipment
■■ Distributed power architecture
VIN
ENABLE/MODE
POWER GOOD
CIN RPGOOD
CVCC CSS
RON
VIN PVIN
EN/MODE
PGOOD
VOUT
VCC XR79206
SW
SS ILIM
TON
AGND
PGND
FB
RLIM
VOUT
CFF
RFF RFB1
RFB2
COUT
Figure 1. Typical Application
REV1B
100
95
90
85
80
75
70
65
60
0
700kHz
500kHz
12.0V
5.0V
3.3V
1.8V
123456
IOUT (A)
Figure 2. Efficiency, 24VIN
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1 page




XR79206 pdf
Pin Configuration
XR79206
SS
PGOOD
FB
AGND
AGND
VIN
VCC
PGND
SW
SW
SW
SW
PGND
PGND
PGND
PGND
PGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
AGND
PAD
BST
PAD
SW
PAD
PGND
PAD 1
53 PGND
PVIN
PAD
PGND
PAD 2
52 PGND
51 PGND
50 VOUT
49 VOUT
48 VOUT
47 VOUT
46 VOUT
45 VOUT
VOUT 44 VOUT
PAD 43 VOUT
42 VOUT
41 VOUT
40 VOUT
39 VOUT
38 VOUT
37 VOUT
Pin Functions
Pin Number
1
2
3
4, 5, 69, 70,
AGND Pad
6
7
8
13-23, 51-56,
PGND Pads
9-12, 24-30,
SW Pad
31-50,
VOUT Pad
58-65,
PVIN Pad
66, 67,
BST Pad
68
71
72
Pin Name
SS
PGOOD
FB
AGND
VIN
VCC
PGND
PGND
SW
VOUT
PVIN
BST
ILIM
EN/MODE
TON
Type Description
A
OD, O
A
Soft-start pin. Connect an external capacitor between SS and AGND to program the soft-start rate based
on the 10μA internal source current.
Power-good output. This open-drain output is pulled low when VOUT is outside the regulation.
Feedback input to feedback comparator. Connect with a set of resistors to VOUT and AGND in order to
program VOUT.
A Analog ground. Control circuitry of the IC is referenced to this pin. Connect to PGND.
PWR
PWR
PWR
IC supply input. Provides power to internal LDO. Connect to PVIN pins.
The output of LDO. Bypass with a 4.7μF capacitor to AGND.
Controller low-side driver ground. Connect with a short trace to closest PGND pins or PGND pad.
PWR Ground of the power stage. Should be connected to the system’s power ground plane.
PWR
Switching node. It internally connects the source of the high-side FET, the drain of the low-side FET,
the inductor and bootstrap capacitor. Use thermal vias and/or sufficient PCB land area in order to heatsink
the low-side FET and the inductor.
PWR Output of the power stage. Place the output filter capacitors as close as possible to these pins.
PWR Power stage input voltage. Place the input filter capacitors as close as possible to these pins.
A
Controller high-side driver supply pin. It is internally connected to SW via a 0.1μF bootstrap capacitor.
Leave these pins floating.
A Overcurrent protection programming. Connect with a short trace to SW pins.
I
Precision enable pin. Pulling this pin above 1.9V will turn the IC on and it will operate in Forced CCM. If the
voltage is raised above 3.0V, then the IC will operate in DCM or CCM depending on load.
A Constant on-time programming pin. Connect with a resistor to AGND.
NOTE:
A = Analog, I = Input, O = Output, OD = Open Drain, PWR = Power.
REV1B
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5 Page





XR79206 arduino
XR79206
Applications Information
Functional Description
XR79206 is a synchronous step-down proprietary
emulated current-mode Constant On-Time (COT) module.
The on-time, which is programmed via RON,
is inversely proportional to VIN and maintains a nearly
constant frequency. The emulated current-mode control is
stable with ceramic output capacitors.
Each switching cycle begins with GH signal turning on
the high-side (switching) FET for a preprogrammed time.
At the end of the on-time, the high-side FET is turned off
and the low-side (synchronous) FET is turned on for a
preset minimum time (250ns nominal). This parameter is
termed minimum off-time. After the minimum off-time, the
voltage at the feedback pin FB is compared to an internal
voltage ramp at the feedback comparator. When VFB drops
below the ramp voltage, the high-side FET is turned on
and the cycle repeats. This voltage ramp constitutes an
emulated current ramp and makes possible the use of
ceramic capacitors, in addition to other capacitor types,
for output filtering.
Enable/Mode Input (EN/MODE)
EN/MODE pin accepts a tri-level signal that is used to control
turn on/off. It also selects between two modes of operation:
forced CCM and DCM/CCM. If EN is pulled below 1.8V,
the module shuts down. A voltage between 2.0V and 2.8V
selects the forced CCM mode which will run the module in
continuous conduction at all times. A voltage higher than
3.1V selects the DCM/CCM mode which will run the module
in discontinuous conduction at light loads.
Selecting the Forced CCM Mode
In order to set the module to operate in forced CCM, a voltage
between 2.0V and 2.8V must be applied to EN/MODE.
This can be achieved with an external control signal
that meets the above voltage requirement. Where an
external control is not available, the EN/MODE can be
derived from VIN. If VIN is well regulated, use a resistor
divider and set the voltage to 2.5V. If VIN varies over a
wide range, the circuit shown in Figure 25 can be used
to generate the required voltage. Note that at VIN of
5.0V and 40V the nominal Zener voltage is 4.0V and
5.0V respectively. Therefore for VIN in the range of 5.0V
to 40V, the circuit shown in Figure 25 will generate VEN
required for forced CCM.
Selecting the DCM/CCM Mode
In order to set the module operation to DCM/CCM, a voltage
between 3.1V and 5.5V must be applied to EN/MODE pin.
If an external control signal is available, it can be directly
connected to EN/MODE. In applications where an external
control is not available, EN/MODE input can be derived
from VIN. If VIN is well regulated, use a resistor divider
and set the voltage to 4V. If VIN varies over a wide range,
the circuit shown in Figure 26 can be used to generate the
required voltage for DCM/CCM operation.
VIN
RZ
10k
Zener
MMSZ4685T1G or
Equivalent
R1
30.1k, 1%
R2 EN/MODE
35.7k, 1%
Forced CCM, wide VIN range
Figure 25. Selecting Forced CCM by
Deriving EN/MODE from VIN
VIN
Zener
MMSZ4685T1G or
Equivalent
RZ
10k
VEN
EN/MODE
DCM/CCM, wide VIN range
Figure 26. Selecting DCM/CCM by
Deriving EN/MODE from VIN
REV1B
11/19

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