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MP2234S Scheda tecnica(PDF) 12 Page - Monolithic Power Systems

Il numero della parte MP2234S
Spiegazioni elettronici  High-Efficiency, 2A, 16V, 800kHz Synchronous, Step-Down Converter
Download  19 Pages
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Produttore elettronici  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2234S Scheda tecnica(HTML) 12 Page - Monolithic Power Systems

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MP2234S – SYNCHRONOUS STEP-DOWN CONVERTER
MP2234S Rev.1.0
www.MonolithicPower.com
12
4/3/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
network minimizes the external component
counts and simplifies the control loop design.
Enable/SYNC Control
EN/SYNC is a digital control pin that turns the
regulator on and off. Drive EN high to turn on
the regulator; drive it low to turn it off. An
internal 1MΩ resistor from EN/SYNC to GND
allows EN/SYNC to be floated to shut down the
chip. The EN/SYNC pin is clamped internally
using a 6.5V series-Zener-diode (see Figure 4).
Connecting the EN/SYNC input pin through a
pull-up resistor to the voltage on the IN pin
limits the EN input current to less than 100µA.
For example, with 12V connected to IN, RPULLUP
≥ (12V – 6.5V) ÷ 100µA = 55kΩ.
Connecting the EN pin directly to a voltage
source without any pull-up resistor requires
limiting the amplitude of the voltage source to
≤6V to prevent damage to the Zener diode.
Figure 4. 6.5V Zener Diode Connection
For external clock synchronization, connect a
clock with a frequency range between 300kHz
and 2MHz 2ms after the output voltage is set:
The internal clock rising edge will synchronize
with the external clock rising edge. Select an
external clock signal with a pulse width less
than 1μs.
Under-Voltage Lockout (UVLO)
The MP2234S has under-voltage lock-out
protection (UVLO). When the VCC voltage
exceeds the UVLO rising threshold voltage, the
device begins to power-up. It shuts off when
the VCC voltage drops below the UVLO falling
threshold voltage. This is non-latch protection.
The MP2234S is disabled when the input
voltage falls below 3.2V (Typ). If an application
requires a higher under-voltage lockout (UVLO)
threshold, use the EN pin to adjust the input
voltage UVLO by using two external resistors
(see Figure 5). For best results, set the UVLO
falling threshold (VSTOP) above 4.5V using the
enable resistors. Set the rising threshold
(VSTART) to provide enough hysteresis to
allow for input-supply variations.
RENUP
RENDOWN
Figure 5
. Adjustable UVLO
Soft-Start (SS)
Adjust the soft-start time by connecting a
capacitor from SS pin to ground. When the soft-
start begins, an internal 11µA current source
charges the external capacitor. The soft-start
capacitor connects to the non-inverting input of
the error amplifier. The soft-start period
continues until the voltage on the soft-start
capacitor exceeds the 0.804V reference. Then
the non-inverting amplifier takes the reference
voltage as the input. Use the following equation
to calculate the soft-start time:
SS
0.804V Css(nF)
t(ms)
11 A
×
=
μ
Over-Current-Protection (OCP) and Hiccup
The MP2234S has a cycle-by-cycle over-
current limit when the inductor current peak
value exceeds the set current limit threshold.
Meanwhile, the output voltage drops until VFB is
below the Under-Voltage (UV) threshold—
typically 50% below the reference. Once UV is
triggered, the MP2234S enters hiccup mode to
periodically restart the part. This protection
mode is especially useful when the output is
dead-shorted to ground, and greatly reduces
the average short circuit current to alleviate
thermal issues and protect the regulator. The
MP2234S exits the hiccup mode once the over-
current condition is removed.


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