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PDF ZTP7193SI Data sheet ( Hoja de datos )
| Número de pieza | ZTP7193SI | |
| Descripción | Synchronous Step-Down DC/DC Converter | |
| Fabricantes | ZillTek | |
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ZTP7193SI
3A, 18V, 500KHz, Synchronous Step-Down DC/DC Converter
FEATURES
● 4.75V to 18V input voltage
● Output adjustable from 0.923V to 15V
● Output current up to 3A
● Integrated 105mΩ/85mΩ power MOSFET switches
● Shutdown current 3μA typical
● Efficiency up to 95%
● Fixed frequency 500KHz
● Internal soft start
● Over current protection and Hiccup
● Over temperature protection
● RoHS Compliant and 100% Lead (Pb) Free
APPLICATIONS
● Distributed power systems
● Networking systems
● FPGA, DSP, ASIC power supplies
● Notebook computers
● Green electronics or appliance
ORDERING INFORMATION
PART
PACKAGE RoHS
ZTP7193SI SOP-8L (EP) Yes
Ship, Quantity
Tape and Reel
DESCRIPTION
The ZTP7193SI is a high-frequency, synchronous,
rectified, step-down, switch-mode converter with
internal power MOSFETs. It offers a very compact
solution to achieve a 3A continuous output current over
a wide input supply range, with excellent load and line
regulation. The ZTP7193SI has synchronous-mode
operation for higher efficiency over the output
current-load range.
Current-mode operation provides fast transient
response and eases loop stabilization.
Protection features include over-current protection and
thermal shutdown.
The ZTP7193SI requires a minimal number of readily
available, standard external components and is available
in a space-saving SOP-8L(EP) package.
Pins Configuration
Typical Application Circuit
Note: R5 and C7 are optional.
Details please see the DVT report.
DS-08; Nov. 07, 2013
-1-
Copyright © ZillTek Technology Corp.
http://www.younssemi.com/ Tel:0755-23324035
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: [email protected]
1 page  
ZTP7193SI
APPLICATION INFORMATION
Overview
The ZTP7193SI is a synchronous rectified, current-mode,
step-down regulator. It regulates input voltages from
4.75V to 18V down to an output voltage as low as
0.923V, and supplies up to 3A of load current.
The ZTP7193SI uses current-mode control to regulate
the output voltage. The output voltage is measured at
FB through a resistive voltage divider and amplified
through the internal transconductance error amplifier.
The converter uses internal N-Channel MOSFET switches
to step-down the input voltage to the regulated output
voltage. Since the high side MOSFET requires a gate
voltage greater than the input voltage, a boost capacitor
connected between SW and BOOT is needed to drive
the high side gate. The boost capacitor is charged from
the internal 5V rail when SW is low.
When the ZTP7193SI FB pin exceeds 10% of the nominal
regulation voltage of 0.923V, the over voltage
comparator is tripped, forcing the high-side switch off.
Pins Description
BOOT: High-Side Gate Drive Boost Input. BOOT supplies
the drive for the high-side N-Channel MOSFET switch.
Connect a 0.1μF or greater capacitor from SW to BOOT
to power the high side switch.
IN: Power Input. IN supplies the power to the IC, as well
as the step-down converter switches. Drive IN with a
4.75V to 18V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input
to the IC.
SW: Power Switching Output. SW is the switching node
that supplies power to the output. Connect the output
LC filter from SW to the output load. Note that a
capacitor is required from SW to BOOT to power the
high-side switch.
GND: Ground.
FB: Feedback Input. FB senses the output voltage to
regulate that voltage. Drive FB with a resistive voltage
divider from the output voltage. The feedback threshold
is 0.923V.
EN: Enable Input. EN is a digital input that turns the
regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. Pull up with 100kΩ
resistor for automatic startup.
Setting the Output Voltage
The output voltage is set using a resistive voltage divider
from the output voltage to FB pin. The voltage divider
divides the output voltage down to the feedback voltage
by the ratio:
VFB = VOUT × R2 / (R1 + R2)
Where VFB is the feedback voltage and VOUT is the output
voltage.
Thus the output voltage is:
VOUT = 0.923 × (R1 + R2) / R2
R2 can be as high as 100kΩ, but a typical value is 10kΩ.
Using the typical value for R2, R1 is determined by:
R1 = 10.83 × (VOUT − 0.923V) (KΩ)
Inductor
The inductor is required to supply constant current to
the output load while being driven by the switched
input voltage. A larger value inductor will result in less
ripple current that will result in lower output ripple
voltage. However, the larger value inductor will have a
larger physical size, higher series resistance, and/or
lower saturation current. A good rule for determining
the inductance to use is to allow the peak-to-peak ripple
current in the inductor to be approximately 30% of the
maximum switch current limit. Also, make sure that the
peak inductor current is below the maximum switch
current limit. The inductance value can be calculated by:
L = [ VOUT / (fS × ΔIL) ] × (1 − VOUT/VIN)
Where VOUT is the output voltage, VIN is the input voltage,
fS is the switching frequency, and ΔIL is the peak-to-peak
inductor ripple current.
Choose an inductor that will not saturate under the
maximum inductor peak current. The peak inductor
current can be calculated by:
ILP = ILOAD + [ VOUT / (2 × fS × L) ] × (1 − VOUT/VIN)
Where ILOAD is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and any EMI
requirements.
DS-08; Nov. 07, 2013
-5-
Copyright © ZillTek Technology Corp.
http://www.younssemi.com/ Tel:0755-23324035
4F-3, No.5, Technology Rd., Science-Based
Industrial Park, Hsinchu 30078, Taiwan
Tel: (886) 3577 7509; Fax: (886) 3577 7390
Email: [email protected]
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZTP7193SI.PDF ] | |
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