The MP111 has two ground pins (pins 3, 32). These pins
provide a return for the internal capacitive bypassing of the
small signal portions of the MP111. The two ground pins are
not connected together on the substrate. Both of these pins
are required to be connected to the system signal ground.
local parasitic oscillation in the output stage of the MP111. Use
electrolytic capacitors at least 10µF per output amp required.
Bypass the electrolytic capacitors with high quality ceramic
capacitors (X7R) 0.1µF or greater. In most applications power
supply terminals +Vb and -Vb will be connected to +V
S
and
-V
S
respectively. Supply voltages +Vb and -Vb are bypassed
internally but both ground pins 3 and 32 must be connected to
the system signal ground to be effective. In all cases power to
the buffer amplifier stage of the MP111 at pins 8 and 25 must
be connected to +Vb and
-Vb at pins 4 and 30 respectively. Provide local bypass
capacitors at pins 8 and 25. See the external connections
diagram on page 1.
+Vs
Z1
R
F
SAFE OPERATING AREA
The MOSFET output stage of the MP111 is not limited by
second breakdown considerations as in bipolar output stages.
Only thermal considerations and current handling capabilities
limit the SOA (see Safe Operating Area graph on previous page).
The output stage is protected against transient flyback by the
parasitic body diodes of the output stage MOSFET structure.
However, for protection against sustained high energy flyback
external fast-recovery diodes must be used.
-IN
34
Q2
+Vs
+Vb
3
GND
OUT
IN
R
IN
34
I
LIM-
27
28
I
LIM+
R
P
OUT
11-13
20-22
R
LIM
Q1
33
+IN
-Vs
GND
-Vb
32
33
R
L
-Vs
Z2
COMPENSATION
The external compensation capacitor C
C
is connected
between pins 5 and 6. Unity gain stability can be achieved with
any capacitor value larger than 100pF for a minimum phase
margin of 45 degrees. At higher gains more phase shift can
usually be tolerated in most designs and the compensation
capacitor value can be reduced resulting in higher bandwidth
and slew rate. Use the typical operating curves as a guide to
select C
C
for the application. An NPO (COG) type capacitor is
required rated for the full supply voltage (100V).
FIGURE 1
OVERVOLTAGE PROTECTION
FIGURE 2
4 WIRE CURRENT LIMIT
CURRENT LIMIT
The two current limit sense lines are to be connected directly
across the current limit sense resistor. For the current limit to
work correctly pin 28 must be connected to the amplifier output
side and pin 27 connected to the load side of the current limit
resistor R
LIM
as shown in Figure 2. This connection will bypass
any parasitic resistances R
P
, formed by socket and solder joints
as well as internal amplifier losses. The current limiting resistor
may not be placed anywhere in the output circuit except where
shown in Figure 2. The value of the current limit resistor can
be calculated as follows: R
LIM
= .65/I
LIMIT
OVERVOLTAGE PROTECTION
Although the MP111 can withstand differential input voltages
up to ±25V, additional external protection is recommended. In
most applications 1N4148 signal diodes connected anti-parallel
across the input pins is sufficient. In more demanding applica-
tions where bias current is important diode connected JFETs
such as 2N4416 will be required. See Q1 and Q2 in Figure 1.
In either case the differential input voltage will be clamped to
±0.7V. This is usually sufficient overdrive to produce the maxi-
mum power bandwidth. Some applications will also need over
voltage protection devices connected to the power supply rails.
Unidirectional zener diode transient suppressors are recom-
mended. The zeners clamp transients to voltages within the
power supply rating and also clamp power supply reversals to
ground. Whether the zeners are used or not the system power
supply should be evaluated for transient performance including
power-on overshoot and power-off polarity reversals as well as
line regulation. See Z1 and Z2 in Figure 1.
BOOST OPERATION
With the boost feature the small signal stages of the amplifier
are operated at a higher supply voltages than the amplifier's
high current output stage. +Vb (pins 4,8) and -Vb (pins 25,30)
are connected to the small signal stages and +V
S
(pins 14-16)
and -V
S
(pins 17-19) are connected to the high current output
stage. An additional 10V on the +Vb and -Vb pins is sufficient
to allow the small signal stages to drive the output stage into
the triode region and improve the output voltage swing for extra
efficient operation when required. When the boost feature is
not needed +V
S
and -V
S
are connected to the +Vb and -Vb
pins respectively. The +Vb and -Vb pins must not be operated
at supply voltages less than +V
S
and -V
S
respectively.
BACKPLATE GROUNDING
The substrate of the MP111 is an insulated metal substrate.
It is required that it be connected to signal ground. Connect pin
2 (back plate) to signal ground. The back plate will then be AC
grounded to signal ground through a 1µF capacitor.
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +V
S
and -V
S
must be connected physically close to the pins to prevent
4
MP111U
P r o d u c t I n n o v a t i o nF r o m
MP111
ContACting CiRRUs LogiC sUPPoRt
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
[i=s]This post was last edited by paulhyde on 2014-9-15 03:16[/i] A complete list of AD chips and their basic performance indicators. For your reference in the competition!!...
Now I have an STM32F107 development board. According to the lwip routine, I can already communicate with another computer in the local area network through TCP (server written in python) to send and r...
As the title says. For those who want to use this Freescale chip, MC9S08AC32, with 32K FLASH, I think this chip is well made. You can try it. Freescale is a chip with relatively strong anti-interferen...
TI - Industrial Communication Bus Design Solution Based on AMIC Products : https://training.eeworld.com.cn/course/4501With the continuous development of industrial communication, various communication...
To differentiate their products in a crowded and competitive market, manufacturers of handheld devices often consider battery life and power management as key selling points for cell phones, PDAs, ...[Details]
July 11, 2012, Beijing - Altera Corporation (NASDAQ: ALTR) today announced the launch of 40-Gbps Ethernet (40GbE) and 100-Gbps Ethernet (100GbE) intellectual property (IP) core products. These core...[Details]
AD8205 is
a single-supply high-performance differential
amplifier
launched by
Analog
Devices of the United States
. The typical single-supply voltage is 5V, and its common-mode volta...[Details]
Aromatic gases are widely present in food, medicine, cosmetics and various daily chemical products, such as snacks, liquor, spices, Chinese herbal medicines, plasters, perfumes, soaps, shampoos, et...[Details]
In the single-chip microcomputer system, in addition to display devices, sound devices are often used, and the most common sound device is the buzzer. Buzzers are generally used for some low-demand...[Details]
Abstract: Aiming at the needs of coal-rock acoustic emission signal monitoring system, a data acquisition circuit with 24-bit resolution and 16-channel synchronous data acquisition function is desi...[Details]
Abstract: With the development and construction of BeiDou II system, China will shift from the situation dominated by GPS to the situation dominated by BeiDou II global navigation system independen...[Details]
The serial interface real-time clock chip DS1302 launched by Dallas Company in the United States can trickle charge the backup battery of the clock chip. Due to the main features of the chip such a...[Details]
Temperature compensated quartz crystal oscillator (TCXO) is widely used as a high-precision frequency source in communication systems, radar navigation systems, precision measurement and control sy...[Details]
At present, with the diversification of portable products and the almost harsh requirements for audio and video parts, the power consumption requirements of the whole machine have been raised to a ...[Details]
Don’t just look at the power when choosing a power supply
We know that a power supply with a low rated power can hardly meet the power supply needs of the system, which may cause frequent free...[Details]
It should be understood as follows: DC-DC means direct current to direct current (conversion of different DC power values). Anything that meets this definition can be called a DC-DC converter, incl...[Details]
Measurement compatibility
It is very important to ensure the compatibility between the pressure sensor and its actual application. Before making a pressure sensor selection, the fo...[Details]
1 Introduction
At present, advocating health has become the focus of people's attention, and the emergence of treadmills has become more and more popular. People can exercise at home or in the ...[Details]
Stepper motors have been widely used in automatic or semi-automatic equipment such as CNC machine tools, medical equipment, and instruments. The usual way to control stepper motors with computers i...[Details]
Electronics Design Contest
京公网安备 11010802033920号
EEWORLD
