AMS AMS1510

AMS1510
FEATURES
APPLICATIONS
• Adjustable or Fixed Output
1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V
• Output Current of 10A
• Low Dropout, 500mV at 10A Output Current
• Fast Transient Response
• Remote Sense
• High Current Regulators
• Post Regulators for Switching Supplies
• Microprocessor Supply
• Adjustable Power Supply
• Notebook/Personal Computer Supplies
GENERAL DESCRIPTION
The
The AMS1510 series of adjustable and fixed low dropout voltage regulators are designed to provide 10A output current to
power the new generation of microprocessors. The dropout voltage of the device is 100mV at light loads and rising to 500mV
at maximum output current. A second low current input voltage 1V or greater then the output voltage is required to achieve this
dropout. The AMS1510 can also be used as a single supply device.
New features have been added to the AMS1510: a remote Sense pin is brought out virtually eliminating output voltage
variations due to load changes. The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 10A
is less than 1mV.
The AMS1510 series has fast transient response. The Adjust pin is brought out on fixed devices. To further improve the
transient response the addition of a small capacitor on the Adjust pin is recommended.
The AMS1510 series are ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V
supplies are available.
The AMS1510 devices are offered in 5 lead TO-220 and TO-263 (plastic DD) packages.
ORDERING INFORMATION:
PACKAGE TYPE
5 LEAD TO-263
AMS1510CM
AMS1510CM-1.5
AMS1510CM-2.5
AMS1510CM-2.85
AMS1510CM-3.0
AMS1510CM-3.3
AMS1510CM-3.5
AMS1510CM-5.0
5 LEAD TO-220
AMS1510CT
AMS1510CT-1.5
AMS1510CT-2.5
AMS1510CT-2.85
AMS1510CT-3.0
AMS1510CT-3.3
AMS1510CT-3.5
AMS1510CT-5.0
PIN CONNECTIONS
OPERATING JUNCTION
TEMPERATURE RANGE
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
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5 LEAD TO-220
5
4
3
2
1
FRONT VIEW
VPOWER
VCONTROL
OUTPUT
ADJUST/GND
SENSE
AMS1510
ABSOLUTE MAXIMUM RATINGS (Note 1)
VPOWER Input Voltage
VCONTROL Input Voltage
Operating Junction Temperature Range
Control Section
Power Transistor
Storage temperature
7V
13V
Soldering information
Lead Temperature (25 sec)
Thermal Resistance
TO-220 package
TO-263 package
0°C to 125°C
0°C to 150°C
- 65°C to +150°C
265°C
φ JA= 50°C/W
φ JA= 30°C/W*
* With package soldering to 0.5in2 copper area over backside ground
plane or internal power plane φ JA can vary from 20°C/W to
>40°C/W depending on mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at ILOAD = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Device
Conditions
Reference Voltage
AMS1510
VCONTROL = 2.75V, VPOWER =2V, ILOAD = 10mA
VCONTROL = 2.7V to 12V, VPOWER =3.3V to 5.5V,
ILOAD = 10mA to 10A
1.243
1.237
Output Voltage
AMS1510-1.5
VCONTROL = 4V, VPOWER =2.V, ILOAD = 0mA
VCONTROL = 3V, VPOWER =2.3V, ILOAD = 0mA to 10A
AMS1510-2.5
Line Regulation
Min
Typ
Max
Units
1.250
1.250
1.258
1.263
V
V
1.491
1.485
1.500
1.500
1.509
1.515
V
V
VCONTROL = 5V, VPOWER =3.3V, ILOAD = 0mA
VCONTROL = 4V, VPOWER =3.3V, ILOAD = 0mA to 10A
2.485
2.475
2.500
2.500
2.515
2.525
V
V
AMS1510-2.85
VCONTROL = 5.35V, VPOWER =3.35V, ILOAD = 0mA
VCONTROL = 4.4V, VPOWER =3.7V, ILOAD = 0mA to 10A
2.821
2.833
2.850
2.850
2.879
2.867
V
V
AMS1510-3.0
VCONTROL = 5.5V, VPOWER =3.5V, ILOAD = 0mA
VCONTROL = 4.5V, VPOWER =3.8V, ILOAD = 0mA to 10A
2.982
2.970
3.000
3.000
3.018
3.030
V
V
AMS1510-3.3
VCONTROL = 5.8V, VPOWER =3.8V, ILOAD = 0mA
VCONTROL = 4.8V, VPOWER =4.1V, ILOAD = 0mA to 10A
3.280
3.235
3.300
3.300
3.320
3.333
V
V
AMS1510-3.5
VCONTROL = 6V, VPOWER =4V, ILOAD = 0mA
VCONTROL = 5V, VPOWER =4.3V, ILOAD = 0mA to 10A
3.479
3.430
3.500
3.500
3.521
3.535
V
V
AMS1510-5.0
VCONTROL = 7.5V, VPOWER =5.5V, ILOAD = 0mA
VCONTROL = 6.5V, VPOWER =5.8V, ILOAD = 0mA to 10A
4.930
4.950
5.000
5.000
5.030
5.050
V
V
1
3
mV
1
5
mV
5
10
mA
100
170
mA
6
10
mA
50
120
µA
AMS1510/-1.5/-2.5/
ILOAD = 10 mA , 1.5V≤ (VCONTROL - VOUT) ≤ 12V
-2.85/-3.0/-3.3/-3.5/-5.0
0.8V≤ (VPOWER - VOUT) ≤ 5.5V
AMS1510/-1.5/-2.5/
VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V,
-2.85/-3.0/-3.3/-3.5/-5.0
ILOAD = 10mA to 10A
Minimum Load
Current
AMS1510
VCONTROL = 5V, VPOWER =3.3V, VADJ = 0V (Note 3)
Control Pin Current
AMS1510/-1.5/-2.5/
VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V,
(Note 4)
-2.85/-3.0/-3.3/-3.5/-5.0
ILOAD = 10mA to 10A
Ground Pin Current
AMS1510/-1.5/-2.5/
VCONTROL = VOUT + 2.5V, VPOWER =VOUT + 0.8V,
(Note 4)
-2.85/-3.0/-3.3/-3.5/-5.0
ILOAD = 10mA to 10A
Adjust Pin Current
AMS1510
VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 10mA
Current Limit
AMS1510/-1.5/-2.5/
(VIN - VOUT) = 5V
11
12
A
AMS1510/-1.5/-2.5/
VCONTROL = VPOWER = VOUT + 2.5V, VRIPPLE = 1VP-P
60
80
dB
-2.85/-3.0/-3.3/-3.5/-5.0
ILOAD = 5A
AMS1510
TA = 25°C, 30ms pulse
Load Regulation
-2.85/-3.0/-3.3/-3.5/-5.0
Ripple Rejection
Thermal Regulation
Thermal Resistance
Junction-to-Case
0.002
0.020
%W
T Package: Control Circuitry/ Power Transistor
0.65/2.7
°C/W
M Package: Control Circuitry/ Power Transistor
0.65/2.7
°C/W
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AMS1510
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.
Parameter
Device
Conditions
Min
Typ
Max
Units
Note 2
Dropout Voltage
Control Dropout
(VCONTROL - VOUT)
AMS1510/-1.5/-2.5/
VPOWER =VOUT + 0.8V, ILOAD = 10mA
1.00
1.15
V
-2.85/-3.0/-3.3/-3.5/-5.0
VPOWER =VOUT + 0.8V, ILOAD = 10A
1.15
1.30
V
Power Dropout
(VPOWER - VOUT)
AMS1510/-1.5/-2.5/
VCONTROL =VOUT + 2.5V, ILOAD = 10mA
.10
0.17
V
-2.85/-3.0/-3.3/-3.5/-5.0
VCONTROL =VOUT + 2.5V, ILOAD = 10A
.45
0.60
V
Parameters identified with boldface type apply over the full operating temperature range.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.
Note 2: Unless otherwise specified VOUT = VSENSE. For the adjustable device VADJ = 0V.
Note 3: The dropout voltage for the AMS1510 is caused by either minimum control voltage or minimum power voltage. The specifications represent the
minimum input/output voltage required to maintain 1% regulation.
Note 4: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor
divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 5: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of about 1:100. The
minimum value is equal to the quiescent current of the device.
PIN FUNCTIONS
Sense (Pin 1): This pin is the positive side of the reference
voltage for the device. With this pin it is possible to Kelvin
sense the output voltage at the load.
Output (Pin 3): This is the power output of the device.
VCONTROL (Pin 4): This pin is the supply pin for the
control circuitry of the device. The current flow into this
pin will be about 1% of the output current. The voltage
at this pin must be 1.3V or greater than the output
voltage for the device to regulate.
Adjust (Pin 2): This pin is the negative side of the
reference voltage for the device. Adding a small bypass
capacitor from the Adjust pin to ground improves the
transient response. For fixed voltage devices the Adjust pin
is also brought out to allow the user to add a bypass
capacitor.
VPOWER (Pin 5): This pin is the collector to the power
device of the AMS1510. The output load current is
supplied through this pin. The voltage at this pin must
be between 0.1V and 0.8V greater than the output
voltage for the device to regulate.
GND (Pin 2): For fixed voltage devices this is the bottom
of the resistor divider that sets the output voltage.
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AMS1510
APPLICATION HINTS
The AMS1510 series of adjustable and fixed regulators are
designed to power the new generation of microprocessors. The
AMS1510 is designed to make use of multiple power supplies,
existing in most systems, to reduce the dropout voltage. One of the
advantages of the two supply approach is maximizing the
efficiency.
The second supply is at least 1V greater than output voltage and is
providing the power for the control circuitry and supplies the drive
current to the NPN output transistor. This allows the NPN to be
driven into saturation; thereby reducing the dropout voltage by a
VBE compared to conventional designs. For the control voltage
the current requirement is small equal to about 1% of the output
current or approximately 100mA for a 10A load. Most of this
current is drive current for the NPN output transistor. This drive
current becomes part of the output current. The maximum voltage
on the Control pin is 13V. The maximum voltage at the Power pin
is 7V. Ground pin current for fixed voltage devices is typical 6mA
and is constant as a function of load. Adjust pin current for
adjustable devices is 60µA at 25°C and varies proportional to
absolute temperature.
The improved frequency compensation of AMS1510 permits the
use of capacitors with very low ESR. This is critical in addressing
the needs of modern, low voltage high sped microprocessors. The
new generation of microprocessors cycle load current from several
hundred mA to several A in tens of nanoseconds. Output voltage
tolerances are tighter and include transient response as part of the
specification. Designed to meet the fast current load step
requirements of these microprocessors, the AMS1510 also saves
total cost by needing less output capacitance to maintain
regulation.
Careful design of the AMS1510 has eliminated any supply
sequencing issues associated with a dual supply system. The
output voltage will not turn on until both supplies are operating. If
the control voltage comes up first, the output current will be
limited to a few milliamperes until the power input voltage comes
up. If power input comes up first the output will not turn on at all
until the control voltage comes up. The output can never come up
unregulated. By tying the control and power inputs together the
AMS1510 can also be operated as a single supply device. In single
supply operation the dropout will be determined by the minimum
control voltage.
The new features of the AMS1510 require additional pins over the
traditional 3-terminal regulator. Both the fixed and adjustable
versions have remote sense pins, permitting very accurate
regulation of output voltage at the load, rather than at the
regulator. As a result, over an output current range of 100mA to
10A with a 2.5V output, the typical load regulation is less than
1mV. For the fixed voltages the adjust pin is brought out allowing
the user to improve transient response by bypassing the internal
resistor divider. Optimum transient response is provided using a
capacitor in the range of 0.1µF to 1µF for bypassing the Adjust
pin. The value chosen will depend on the amount of output
capacitance in the system.
In addition to the enhancements mentioned, the reference accuracy
has been improved by a factor of two with a guaranteed initial
tolerance of ±0.6% at 25°C. This device can hold 1% accuracy
over the full temperature range and load current range,
guaranteed, when combined with ratiometrically accurate internal
divider resistors and operating with an input/output differential of
well under 1V.
Typical applications for the AMS1510 include 3.3V to 2.5V
conversion with a 5V control supply, 5V to 4.2V conversion with
a 12V control supply or 5V to 3.6V conversion with a 12V
control supply. Due to the innovative design of the AMS1510 it is
easy to obtain dropout voltages of less than 0.5V at 6A along with
excellent static and dynamic specifications. Capable of 10A of
output current with a maximum dropout of 0.8V the AMS1510
also has a fast transient response that allows it to handle large
current changes associated with the new generation of
microprocessors. The device is fully protected against overcurrent
and overtemperature conditions.
Grounding and Output Sensing
The AMS1510 allows true Kelvin sensing for both the high and
low side of the load. As a result the voltage regulation at he load
can be easily optimized. Voltage drops due to parasitic resistances
between the regulator and the load can be placed inside the
regulation loop of the AMS1510. The advantages of remote
sensing are illustrated in figures 1 through 3.
Figure 1 shows the device connected as a conventional 3 terminal
regulator with the Sense lead connected directly to the output of
the device. RP is the parasitic resistance of the connections
between the device and the load. Typically the load is a
microprocessor and RP is made up of the PC traces and /or
connector resistances (in the case of a modular regulator) between
the regulator and the processor. Trace A of figure 3 illustrates the
effect of RP. Very small resistances cause significant load
regulation steps.
Figure 2 shows the device connected to take advantage of the
remote sense feature. The Sense pin and the top of the resistor
divider are connected to the top of the load; the bottom of the
resistor divider is connected to the bottom of the load. RP is now
connected inside the regulation loop of the AMS1510 and for
reasonable values of RP the load regulation at the load will be
negligible. The effect on output regulation can be seen in trace B
of figure 3.
5V
3.3V
CONTROL
POWER
SENSE
AMS1510
OUTPUT
ADJ
LOAD
R1
R2
RP
Figure 1. Conventional Load Sensing
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RP
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VOUT
-
AMS1510
APPLICATION HINTS
to allow this capability. To ensure good transient response with
heavy load current changes capacitor values on the order of 100µF
are used in the output of many regulators. To further improve
stability and transient response of these devices larger values of
output capacitor can be used.
The modern processors generate large high frequency current
transients. The load current step contains higher order frequency
components than the output coupling network must handle until
the regulator throttles to the load current level. Because they
contain parasitic resistance and inductance, capacitors are not
ideal elements. These parasitic elements dominate the change in
output voltage at the beginning of a transient load step change.
The ESR of the output capacitors produces an instantaneous step
in output voltage (∆V=∆I)(ESR). The ESL of the output
capacitors produces a droop proportional to the rate of change of
the output current (V= L)(∆I/∆t). The output capacitance produces
a change in output voltage proportional to the time until the
regulator can respond (∆V=∆t) (∆I/C). Figure 4 illustrates these
transient effects.
5V
3.3V
CONTROL
POWER
SENSE
AMS1510
OUTPUT
ADJ
+
RP
LOAD
R1
R2
RP
VOUT
-
Figure 2. Remote Load Sensing
(∆IOUT)(RP)
VOUT
FIGURE 1
ESR
EFFECTS
VOUT
FIGURE 2
ESL
EFFECTS
CAPACITANCE
EFFECTS
SLOPE, V/t = ∆I/C
IOUT
POINT AT WHICH REGULATOR
TAKES CONTROL
TIME
Figure 4.
Figure 3. Remote Sensing Improves Load Regulation
Output Voltage
Voltage drops due to RP are not eliminated; they will add to the
dropout voltage of the regulator regardless of whether they are
inside or outside the regulation loop. The AMS1510 can control
the voltage at the load as long as the input-output voltage is greater
than the total of the dropout voltage of the device plus the voltage
drop across RP.
The AMS1510 series develops a 1.25V reference voltage between
the Sense pin and the Adjust pin (Figure5). Placing a resistor
between these two terminals causes a constant current to flow
through R1 and down through R2 to set the overall output voltage.
In general R1 is chosen so that this current is the specified
minimum load current of 10mA.The current out of the Adjust pin
is small, typically 50µA and it adds to the current from R1.
Because IADJ is very small it needs to be considered only when
very precise output voltage setting is required. For best regulation
the top of the resistor divider should be connected directly to the
Sense pin.
Stability
The circuit design used in the AMS1510 series requires the use of
an output capacitor as part of the device frequency compensation.
The addition of 150µF aluminum electrolytic or a 22µF solid
tantalum on the output will ensure stability for all operating
conditions. For best frequency response use capacitors with an
ESR of less than 1Ω.
In order to meet the transient requirements of the processor larger
value capacitors are needed. Tight voltage tolerances are required
in the power supply. To limit the high frequency noise generated
by the processor high quality bypass capacitors must be used. In
order to limit parasitic inductance (ESL) and resistance (ESR) in
the capacitors to acceptable limits, multiple small ceramic
capacitors in addition to high quality solid tantalum capacitors are
required.
When the adjustment terminal is bypassed to improve the ripple
rejection, the requirement for an output capacitor increases. The
Adjust pin is brought out on the fixed voltage device specifically
VCONTROL
+
CONTROL
POWER
OUTPUT
VPOWER
+
ADJ
VREF
R1
IADJ
50µA
R2
VOUT = VREF (1+ R2/R1)+IADJR2
Figure 5. Setting Output Voltage
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SENSE
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VOUT
AMS1510
APPLICATION HINTS
Thermal resistance specification for both the Control Section and
the Power Transistor are given in the electrical characteristics. The
thermal resistance of the Control section is given as 0.65°C/W and
junction temperature of the Control section can run up to 125°C.
The thermal resistance of the Power section is given as 2.7°C/W
and junction temperature of the Power section can run up to
150°C. Due to the thermal gradients between the power transistor
and the control circuitry there is a significant difference in thermal
resistance between the Control and Power sections.
Virtually all the power dissipated by the device is dissipated in the
power transistor. The temperature rise in the power transistor will
be greater than the temperature rise in the Control section making
the thermal resistance lower in the Control section. At power
levels below 12W the temperature gradient will be less than 25°C
and the maximum ambient temperature will be determined by the
junction temperature of the Control section. This is due to the
lower maximum junction temperature in the Control section. At
power levels above 12W the temperature gradient will be greater
than 25°C and the maximum ambient temperature will be
determined by the Power section. In both cases the junction
temperature is determined by the total power dissipated in the
device. For most low dropout applications the power dissipation
will be less than 12W.
The power in the device is made up of two components: the power
in the output transistor and the power in the drive circuit. The
power in the control circuit is negligible.
The power in the drive circuit is equal to:
Protection Diodes
Unlike older regulators, the AMS1510 family does not need any
protection diodes between the adjustment pin and the output and
from the output to the input to prevent die over-stress. Internal
resistors are limiting the internal current paths on the AMS1510
adjustment pin, therefore even with bypass capacitors on the adjust
pin no protection diode is needed to ensure device safety under
short-circuit conditions. The Adjust pin can be driven on a
transient basis ±7V with respect to the output without any device
degradation.
Diodes between the Output pin and VPOWER pin are not usually
needed. Microsecond surge currents of 50A to 100A can be
handled by the internal diode between the Output pin and VPOWER
pin of the device. In normal operations it is difficult to get those
values of surge currents even with the use of large output
capacitances. If high value output capacitors are used, such as
1000µF to 5000µF and the VPOWER pin is instantaneously shorted
to ground, damage can occur. A diode from output to input is
recommended, when a crowbar circuit at the input of the
AMS1510 is used (Figure 6). Normal power supply cycling or
even plugging and unplugging in the system will not generate
current large enough to do any damage.
VCONTROL
+
D1*
D2*
PDRIVE = (VCONTROL - VOUT)(ICONTROL)
CONTROL
POWER
OUTPUT
VPOWER
+
AMS1510
SENSE
ADJ
+
VOUT
Where ICONTROL is equal to between IOUT/100(typ) and
IOUT/58(max).
The power in the output transistor is equal to:
R1
POUTPUT = (VPOWER -VOUT)(IOUT)
R2
The total power is equal to:
PTOTAL = PDRIVE + POUTPUT
Figure 6. Optional Clamp Diodes Protect Against
Input Crowbar Circuits
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die. This is
the lowest resistance path for the heat flow. In order to ensure the
best possible thermal flow from this area of the package to the
heat sink proper mounting is required. Thermal compound at the
case-to-heat sink interface is recommended. A thermally
conductive spacer can be used, if the case of the device must be
electrically isolated, but its added contribution to thermal
resistance has to be considered.
If the AMS1510 is connected as a single supply device with the
control and power input pins shorted together the internal diode
between the output and the power input pin will protect the control
input pin. As with any IC regulator, none the protection circuitry
will be functional and the internal transistors will break down if
the maximum input to output voltage differential is exceeded.
Thermal Considerations
The AMS1510 series have internal power and thermal limiting
circuitry designed to protect the device under overload conditions.
However maximum junction temperature ratings should not be
exceeded under continuous normal load conditions. Careful
consideration must be given to all sources of thermal resistance
from junction to ambient, including junction-to-case, case-to-heat
sink interface and heat sink resistance itself.
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AMS1510
TYPICAL PERFORMANCE CHARACTERISTICS
Control Pin Current vs
Output Current
MINMUM CONTROL VOLTAGE
(VCONTROL - VOUT)(V)
120
100
80
TYPICAL
DEVICE
60
40
20
0
1.0
MINIMUM POWER VOLTAGE
2
140
1
T J = 125° C
T J = 25° C
0
0
1
2 3 4 5 6 7 8 9
OUTPUT CURRENT (A)
10
0.5
T J = 125° C
T J = 25° C
0
0
1
2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (A)
Reference Voltage vs
Temperature
0
1
1.256
VOUT
50µV/DIV
1.254
1.252
1.250
10A
1.248
1.246
LOAD
1.244
1.242
-50 -25
400mA
0 25 50 75 100 125 150
TEMPERATURE (° C)
50µ/DIV
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2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (A)
Load Current Step Response
1.258
REFERENCE VOLTAGE (V)
CONTROL PIN CURRENT (mA)
Dropout Voltage Minimum Power Voltage
Minimum Control Voltage
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AMS1510
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
5 LEAD TO-220 PLASTIC PACKAGE (T)
0.387-0.413
(9.83-10.49)
0.149-0.153
(3.77-3.87)
DIA
0.170-0.190
(4.32-4.82)
0.045-0.055
(1.143-1.397)
0.240-0.260
(6.100-6.600)
0.575-0.605
(14.61-15.37)
0.460-0.500
(11.684-12.700)
0.335-0.345
(8.51-8.77)
0.980-1.070
(24.892-27.178)
0.520-0.570
(13.208-14.478)
0.062-0.072
(1.570-1.830)
0.032
(0.81)
TYP
0.013-0.023
(0.330-0.584)
0.105
(2.67)
TYP
T (TO-220 ) AMS DRW# 042194
5 LEAD TO-263 PLASTIC PACKAGE (M)
0.390-0.415
(9.906-10.541)
0.165-0.180
(4.191-4.572)
0.060
(1.524)
TYP
0.004 +0.008
-0.004
(0.102 +0.203 )
-0.102
0.330-0.370
(8.382-9.398)
0.199-0.218
(5.05-5.54)
0.057-0.077
(1.447-1.955)
0.032
(0.81)
TYP
0.108
(2.74)
TYP
0.095-0.115
(2.413-2.921)
0.90-0.110
(2.29-2.79)
0.013-0.023
(0.330-0.584)
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0.045-0.055
(1.143-1.397)
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M (DD5) AMS DRW#042192R1