MP400FC
MP400FC
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Power Operational Amplifiers
Features
General Description
The MP400FC combines a high voltage, high speed
precision power op amp with a supply voltage boost
function in an integrated thermally conductive module. The voltage boost function uses a switch mode
power supply (SMPS) to boost the input power supply voltage. This allows the user the benefits of using
his standard 12V or 24V buss without the need to design a high voltage supply to power the op amp. The
SMPS voltage is adjustable from 50-350V, allowing for
op amp output voltages up to 340V. External phase
compensation provides the user with the flexibility to
tailor gain, slew rate and bandwidth for a specific application. The unique design of this amplifier provides
extremely high slew rates in pulse applications while
maintaining low quiescent current. The output stage
is well protected with a user defined current limit. Safe
Operating Area (SOA) must be observed for reliable
operation.
♦ Low Cost
♦ Wide Common Mode Range
♦ Standard Supply Voltage
♦ Single Supply: 10V to 50V
♦ Output Current - 150mA Continuous
♦ Output Voltage 50-350V
♦ 350 V/µS Slew Rate
♦ 200 kHz Power Bandwidth
Applications
♦ Piezoelectric positioning and Actuation
♦ Electrostatic Deflection
♦ Deformable Mirror Actuators
♦ Chemical and Biological Stimulators
Equivalent Circuit Diagram
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Copyright
© Cirrus Logic, Inc. 2008
(All Rights Reserved)
MAY 2008
APEX − MP400FCUREVA
P r o d u c t I n n o v a t i o nF r o m
MP400FC
1. Characteristics and Specifications
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and TC = 25°C).
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +Vcc to GND
50
V
OUTPUT CURRENT, peak within SOA
200
mA
POWER DISSIPATION, internal, DC, Amplifier
14.2
W
OUTPUT POWER, SMPS
67
W
INPUT VOLTAGE, Differential
-16
16
V
INPUT VOLTAGE, Common Mode
-16
16
V
225
°C
150
°C
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction
(Note 2)
TEMPERATURE RANGE, storage
−40
105
°C
OPERATING TEMPERATURE, case
−40
85
°C
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
Specifications
Parameter
Test Conditions
Min
Typ
Max
Units
8
40
mV
AMPLIFIER INPUT
OFFSET VOLTAGE
0 to 85°C (Case)
OFFSET VOLTAGE vs. temperature
-63
µV/°C
OFFSET VOLTAGE vs. supply
BIAS CURRENT, initial
(Note 3)
32
µV/V
8.5
200
pA
OFFSET CURRENT, initial
12
400
pA
INPUT RESISTANCE, DC
10
Ω
6
COMMON MODE VOLTAGE RANGE, pos.
+Vs - 2
V
COMMON MODE VOLTAGE RANGE, neg.
-Vs + 5.5
V
118
dB
418mV
µV RMS
120
dB
COMMON MODE REJECTION, DC
90
NOISE
700KHz bandwidth
AMPLIFIER GAIN
OPEN LOOP @ 15Hz
89
GAIN BANDWIDTH PRODUCT @ 1MHz
PHASE MARGIN
Full temperature range
1
MHz
50
°
V
AMPLIFIER OUTPUT
VOLTAGE SWING
IO = 10mA
|VS| - 2
VOLTAGE SWING
IO = 100mA
|VS| - 8.6
VOLTAGE SWING
IO = 150mA
|VS| - 10
CURRENT, continuous, DC
150
SLEW RATE
100
|VS| - 12
V
V
mA
350
V/µS
MP400FCU
P r o d u c t I n n o v a t i o nF r o m
MP400FC
Parameter
Test Conditions
Min
Typ
Max
Units
SETTLING TIME, to 0.1%
2V Step
1
µS
RESISTANCE, No load
RLIM = 6.2Ω
44
Ω
POWER BANDWIDTH, 300VP-P
+VS = 160V, −VS = -160V
200
CURRENT, quiescent, amplifier only
0.2
kHz
0.7
2.5
mA
10
50
V
46.75
365
V
SMPS
INPUT VOLTAGE, VIN
SMPS OUTPUT VOLTAGE, VB
SMPS OUTPUT CURRENT, IS
VB = 10xVIN
150
OUTPUT VOLTAGE TOLERANCE
VB ≤ 10xVIN, IS ≤ 150mA,
RSET = 1%
mA
+/-2
VOLTAGE BOOST
6.5
%
10
x input V
THERMAL
RESISTANCE, DC, junction to case
Full temperature range, f<60Hz
7.7
RESISTANCE, junction to air
Full temperature range
46
TEMPERATURE RANGE, case
°C/W
°C/W
0
70
°C
3. Doubles for every 10oC of temperature increase.
4. +VS and –VS denote the positive and negative supply voltages to the output stage.
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MP400FC
External Connections
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Pin #
Pin name
VIN
Vbias
Q2D
8
VB
6
LFIN
4
+VS
34
RSET
26 – 33
35
PGND
AGND
41
-Vs
39
40
1
+IN
-IN
VOUT
2
36
37
38
42
MP400FCU
Description
Input voltage pins for the on board high voltage switch mode power supply.
Input voltage pin for the boost controller circuitry. This pin is typically tied to VIN
Drain node of the SMPS MOSFET switch. An external RC snubber may be connect from this
node to power ground to reduce or eliminate overshoot and ringing at switch turn off, reducing
switching noise on the SMPS.
This is the output of the high voltage SMPS and typically is tied to pin 6, LFIN. Other loads can
be added to this pin as long as the maximum output power of the SMPS is not exceeded. For
proper operation, an external high voltage, low ESR capacitor must be connected to this pin.
Refer to the paragraph titled “SMPS Output Capacitor”.
The high voltage SMPS, VB , is connected to this pin to power the MP400FC amplifier through a
47uH filter inductor. The supply current in to this pin can not exceed 200mA.
MP400FC amplifier high voltage supply pin. This pin is used for external supply bypass. A high
quality ceramic capacitor of at least 1uF should be used. The high voltage SMPS, VB, can be
connected directly to this pin, bypassing the 47uH filter inductor.
SMPS voltage set resistor. A resistor is connected from this pin to power ground to set the SMPS
voltage.
Power ground. SMPS switching circuits are referenced to ground through these pins.
Analog ground for MP400FC amplifier circuits. AGND and PGND are connected at one point on
the MP400FC. Avoid external connects between AGND and PGND.
This pin is typically connected to AGND. However, an external negative supply voltage can be
connected to this pin.
Amplifier non-inverting input
Amplifier inverting input
Amplifier output
ILIM
Amplifier current limit. A current limit resistor must be connected between ILIM and VOUT. RLIM =
0.7/ILIM.
+ side compensation capacitor connection one.
+ side compensation capacitor connection two.
- side compensation capacitor connection one.
- side compensation capacitor connection two.
CR+
CC+
CRCC-
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Pin Descriptions
21 - 23, 25
24
12 – 15
42-Pin DIP
Package Style FC
P r o d u c t I n n o v a t i o nF r o m
MP400FC
Typical Application
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The MP400FC is ideally suited to driving both piezo actuation and deflection
applications off of a single low voltage
supply. The circuit above boosts a system 24V buss to 350V to drive an ink jet
print head. The MP400FCs high speed
deflection amplifier is biased for single
supply operation by external resistors R2
– R6, so that a 0 to 5V DAC can be used
as the input to the amplifier to drive the
print head from 0 to >300V.
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General
Please read Application Note 1 “General
Operating Considerations” which covers
stability, power supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation.
Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal
power dissipation, current limit, heat sink selection, Apex’s complete Application Notes library, Technical Seminar
Workbook and Evaluation Kits.
40"
Current Limit
For proper operation, the current limit resistor, Rlim, must be connected
as shown in the external connections diagram. The minimum value
is 3.5Ω, however for maximum reliability and protection, the resistor
should be set as high as possible. The value of the resistor is calculated as follows, with Ilim in A; the maximum practical value is 30Ω.
Rlim = 0.7 / Ilim
Safe Operating Area
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Supply Current
The MP400FC features a class A/B driver stage to drive the output
MOSFETs and an innovative input stage to achieve very high slew
rates. The supply current drawn by the MP400FC, even with no load,
varies with the slew rate of the output signal as shown in the graph
below.
Stability
The MP400FC is externally compensated and performance can be
tailored to the application. Use the graphs of small signal response
and power response as a guide. The compensation capacitor CC must
be rated at 500V working voltage. NPO capacitors are recommended.
The compensation capacitors must be mounted closely to the amplifier
pins 36 & 37 and 38 & 42 to avoid spurious oscillation.
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The MOSFET output stage of the MP400FC amplifier is not limited by
second breakdown considerations as in bipolar output stages. Only
thermal considerations and current handling capabilities limit the SOA.
The output stage is protected against transient flyback by the parasitic 4611-:50065165%*''&3&/5*"-74707
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P r o d u c t I n n o v a t i o nF r o m
MP400FC
SMPS Operation
The SMPS output can be adjusted between a minimum of 50V to a maximum
of 350V. The voltage boost adjustment is independent of VIN. Adjustment to
the boost level is made through a resistor from the RSET pin to ground. The
resistor value is:
Rset = (3.16E6 • (351-Vboost)) / (Vboost-1.25) / (4.42E3-(715 • (351-Vboost))
/ (Vboost-1.25))
Where Vboost = desired SMPS voltage.
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The MP400FC is designed to operate off of a standard voltage rail. Typical
values include 12V, 24V, or 48V. The addition of the on-board SMPS eliminates the need to design or purchase a high voltage power supply. The only
inputs required by the SMPS are the VIN source. Input and output filter capacitor, and boost voltage set resistor (RSET).
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2) Rset = 1K (1074 by equation)
If RSET is open, Vboost will be 50V. If RSET is shorted to ground Vboost will be limited to 350V.
SMPS Output Capacitor
An external SMPS output filter capacitor is required for proper operation. ESR considerations prevail in the choice
of the output filter capacitor. Select the highest value capacitor that meets the following ESR requirement. The
minimum value for CBOOST is 100uF.
ESR = dVo/ILPK
Where,
dVo
= the maximum acceptable output ripple voltage
ILPK
= Peak inductor current = (1/L)•Vin•ton
L
= 10E-6 if the internal inductor is used.
Vin
= Input voltage of the application.
ton
= sqrt(2•Io•L•((Vo+0.6-Vin)/(Fsw•Vin2)))
Vboost = The boost supply voltage of the application.
Io
= The maximum continuous output current for the application.
Fsw = 100KHz switching frequency of the MP400FC boost supply.
SMPS Input Capacitor
An external input capacitor is required. This capacitor should be at least 100uF.
MP400FCU
P r o d u c t I n n o v a t i o nF r o m
MP400FC
Thermal Considerations
For reliable operation the MP400FC will require a heatsink for most applications. When chosing the heatsink the
power dissipation in the op amp and the SMPS MOSFET switch (Q2) are both considered. The power dissipation of
the op amp is determined in the same manner as any power op amp. The power dissipation of the MOSFET switch
(Q2) is the sum of the power dissipation due to conduction and the switching power.
PD(Q2) = (IIN(pk)2 • RDS(ON) • D) + (IIN(pk) • VIN • tr • FSW)
Where:
VIN
VB
IO
FSW
RDS(ON)
tr
D
t1 =
= SMPS input voltage
= SMPS output voltage
= total SMPS output current
= 100KHz
= 0.621Ω
= 82 x 10-9s
= T1 • FSW
2 • IO • 10 x 10-6 •
IIN(pk) =
td = t1 •
(
VB - VIN
FSW • VIN2
)
VB • td
10 x 10-6
(
VB
VB - VIN
)
- t1
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries call toll free 800-546-2739 in North America. For International customer support, contact a local Cirrus Logic Sales Representative.
To find the one nearest to you, go to http://www.cirrus.com
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MP400FCU