vpol5a 5 sip series

For more information, please visit the product page.
rev.
page
1 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
features
* high efficiency topology, typically 94% at
3.3 Vdc
* industry standard footprint
* wide ambient temperature range, -40C to
+85C
* cost efficient open frame design
* programmable output voltage via external
resistor from 0.75 to 3.63 Vdc
* no minimum load requirement (stable at all
loads)
* remote on/off
* remote sense compensation
* fixed switching frequency
* continuous short-circuit protection and over
current protection
* over-temperature protection (OTP)
* monotonic startup with pre-bias at the output.
* UL/IEC/EN60950-1 (E222736) certified.
1. INTRODUCTION
2. VPOL5A-5-SIP CONVERTER FEATURES
6. SAFETY
6.1 Input Fusing and Safety Considerations.
3. GENERAL DESCRIPTION
3.1 Electrical Description
7. APPLICATIONS
7.1 Layout Design Challenges.
3.2 Thermal Packaging and Physical Design.
7.2 Convection Requirements for Cooling
4. TECHNICAL SPECIFICATIONS
7.3 Thermal Considerations
5. MAIN FEATURES AND FUNCTIONS
5.1 Operating Temperature Range
7.4 Power De-Rating Curves
5.2 Over-Temperature Protection (OTP)
7.6 Input Capacitance at the Power Module
5.3 Output Voltage Adjustment
7.7 Test Set-Up
5.5 Over Current Protection
7.8 VPOL5A-5-SIP Series Output Voltage Adustment.
5.6 Remote on/off
7.9 Output Ripple and Noise Measurement
5.7 UVLO (Under-Voltage Lockout)
7.10 Output Capacitance
7.5 Efficiency vs Load Curves
8. MECHANICAL OUTLINE DIAGRAMS
8.1 SIP/SMT05 Mechanical Outline Diagrams
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
page
2 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
L1
Q1
1. Introduction
+VIN
This application note describes the features and functions of CUI INC’s
+VO
Q2
C1
VPOL5A-5-SIP series of non-isolated dc-dc converters. These are
D1
C2
highly efficient, reliable and compact, high power density, single output
dc-dc converters. These “point of load” modules serve the needs
specifically of the fixed and mobile telecommunications and computing
COM
COM
market, employing economical distributed power architectures. The
VPOL5A-5-SIP series provide precisely regulated output voltage range
from 0.75 V to 3.63 Vdc over a wide range of input voltage (Vi=3.0 –
PWM IC
ON/OFF
R trim
ERR AMP
5.5 Vdc) and can operate over an ambient temperature range of –40
to +85
R1
TRIM
R2
. Ultra-high efficiency operation is achieved through the use of
synchronous rectification and drive control techniques.
The modules are fully protected against short circuit and overtemperature conditions. CUI INC’s world class automated
manufacturing methods, together with an extensive testing and
qualification program, ensure that all VPOL5A-5-SIP series converters
are extremely reliable.
2. VPOL5A-5-SIP Converter Features
High efficiency topology, typically 94% at 3.3 Vdc
Figure 1. Electrical Block Diagram
3.2 Thermal Packaging and Physical Design.
The VPOL5A-5-SIP series uses a multi-layer FR4 PCB construction.
All surface mount power components are placed on one side of the
PCB, and all low-power control components are placed on the other
side. Thus, the heat dissipation of the power components is optimized,
ensuring that control components are not thermally stressed. The
converter is an open-frame product and has no case or case pin. The
Industry standard footprint
open-frame design has several advantages over encapsulated closed
Wide ambient temperature range, -40C to +85C
devices. Among these advantages are:
Cost efficient open frame design
Programmable output voltage via external resistor from 0.75 to
Efficient Thermal Management: the heat is removed from the
3.63 Vdc
heat generating components without heating more sensitive, small
No minimum load requirement (Stable at all loads)
signal control components.
Remote on/off
Environmental: Lead free open-frame converters are more easily
Remote sense compensation
recycled.
Fixed switching frequency
Cost Efficient: No encapsulation. Cost efficient open-frame
Continuous short-circuit protection and over current protection
construction.
Over-temperature protection (OTP)
Reliable: Efficient cooling provided by open frame construction
Monotonic startup with pre-bias at the output.
offers high reliability and easy diagnostics.
UL/IEC/EN60950 Certified.
3. General Description
3.1 Electrical Description
A block diagram of the VPOL5A-5-SIP Series converter is shown in
Figure 1. Extremely high efficiency power conversion is achieved
through the use of synchronous rectification and drive techniques.
Essentially, the powerful VPOL5A-5-SIP series topology is based on a
non-isolated synchronous buck converter. The control loop is
optimized for unconditional stability, fast transient response and a very
tight line and load regulation. In a typical pre-bias application the
VPOL5A-5-SIP series converters do not draw any reverse current at
start-up. The output voltage can be adjusted from 0.75 to 3.63vdc,
using the TRIM pin with a external resistor. The converter can be shut
down via a remote on/off input that is referenced to ground. This input
is compatible with popular logic devices; a 'positive' logic input is
supplied as standard. Positive logic implies that the converter is
enabled if the remote on/off input is high (or floating), and disabled if it
is low.
The converter is also protected against over-temperature conditions. If
the converter is overloaded or the ambient temperature gets too high,
the converter will shut down to protect the unit.
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
page
3 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
4. Technical Specifications
(All specifications are typical at nominal input, full load at 25 ¢J unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Operating Temperature
See Thermal Considerations Section
NOTES and CONDITIONS
Device
Min.
Typical Max.
Units
ALL
0
5.8
Vdc
ALL
-40
+85
¢J
ALL
-55
+125
¢J
Vo,set ¡ Vin-0.5 Vdc
ALL
3.0
5.5
Vdc
Maximum Input Current
Vin=0 to 5.5 Vdc , Io=Io,max.
ALL
ALL
ALL
ALL
No-Load Input Current
Vo=0.75V
Vo=1.2V
Vo=1.5V
Vo=1.8V
Vo=2.0V
Vo=2.5V
Vo=3.3V
ALL
Off Converter Input Current
Shutdown input idle current
ALL
10
mA
ALL
0.1
As
Storage Temperature
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
2
Inrush Current (I t)
Input Reflected-Ripple Current
5
2.0
1.9
0.1
Vdc
Vdc
Vdc
5
25
30
30
35
35
35
35
A
mA
2
P-P thru 1μH inductor, 5Hz to 20MHz
ALL
150
mA
Output Voltage Set Point
Vin=Nominal Vin , Io=Io.max, Tc=25 ¢J
ALL
-1.5% Vo,set +1.5%
Vdc
Output Voltage Trim Adjustment Range
Selected by an extern al resistor
ALL
OUTPUT CHARACTERISTIC
0.75
3.63
Vdc
Output Voltage R egulation
Load Regulation
Io=Io.min to Io.max
ALL
-0.5
+0.5
%
Line Regulation
Vin=low line to high line
ALL
-0.4
+0.4
%
Temperature Coefficient
Ta=-40 ¢J to 85 ¢J
ALL
-0.03
+0.03
%/¢J
Output Voltage Ripple and Noise
5Hz to 20MHz bandwidth
50
mV
Peak-to-Peak
RMS
Full Load, 1μF ceramic and 10μF tantalum
ALL
Full Load, 1μF ceramic and 10μF tantalum
ALL
20
mV
Lo w ESR
ALL
3000
μF
ALL
0
Output DC Current-Limit Inception
Output Voltage =90% Nominal Output Voltage
ALL
6
Shout Circuit Protection
Continuous with Hiccup Mode
External Capacitive Load
Operating Output Current Range
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
9.5
5
A
15
A
For more information, please visit the product page.
rev.
4 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
PARAMETER
DYNAMIC CHARACTERISTICS
page
NOTES and CONDITIONS
Device
Min.
Typical Max.
Units
Output Voltage Transient Response
Error Brand
50% Step Load Change, di/dt=0.1A/us
ALL
200
mV
Setting Time (within 1% Vout nominal)
50% Step Load Change, di/dt=0.1A/us
ALL
200
us
EFFICIENCY
100% Load
ISOLATION CHARACTERISTICS
Input to Output
Vo=0.75V
Vo=1.2V
Vo=1.5V
Vo=1.8V
Vo=2.0V
Vo=2.5V
Vo=3.3V
ALL
Non-isolation
ALL
79
85
87
89
90
92
94
%
0
Vdc
FEATURE CHARACTERISTICS
Switching Frequency
On/Off Control, Positive Logic Remote On/Off
Logic Low (Module Off)
Logic High (Module On)
On/Off Control, Negative Logic Remote On/Off
Logic Low (Module On)
Logic High (Module Off)
on/off Current (fo r both remote on/off logic)
Leakage Current (for both remote on/off logic)
Turn-On Delay and Rise Time
Turn-On Delay Time, From On/Off Control
Turn-On Delay Time, From Input
Output Voltage R i se Time
Over Temperature Protection
GENERAL SPECIFICATIONS
MTBF
Weight
Dimensions
SIP packages
SMT packages
ALL
or Open Circuit
or Open Circuit
300
Standard Model
0
Suffix “N” Model
0
2.8
Vin
KHz
0.4
Vdc
Vdc
0.4
Vin
Vdc
Vdc
1
1
mA
mA
Ion/off at Von/off=0.0V
Logic High, Von/off=14V
ALL
ALL
Von/off to 10%Vo,set
Vin,min. to 10%Vo,set
10%Vo,set to 90%Vo,set
ALL
ALL
ALL
ALL
2
2
4.5
120
ms
ms
ms
¢J
ALL
1.5
M hours
ALL
2.3
grams
Io=100%of Io.max;Ta=25 ¢J per MIL-HDBK217F
0.9x0.4x0.22 inc hes (22.9x10.16x5.6 mm)
0.8x0.45x0.24 inches(20.3x11.43x6.09 mm)
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
5. Main Features and Functions
5.1 Operating Temperature Range
CUI INC’s VPOL5A-5-SIP series converters highly efficient converter
design has resulted in its ability to operate over a wide ambient
to 85
5 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
temperature environment ( -40
page
). Due consideration must
be given to the de-rating curves when ascertaining maximum power
that can be drawn from the converter. The maximum power drawn is
influenced by a number of factors, such as:
5.5 Over Current Protection
All different voltage models have a full continuous short-circuit
protection. The unit will auto recover once the short circuit is removed.
To provide pr otection in a fault condition, the unit is equipped with
internal over-current protection. The unit operates normally once the
fault condition is removed. The power module will supply up to 150% of
rated current. In the event of an over current converter will go into a
hiccup mode protection.
5.6 Remote On/Off
Input voltage range.
The remote on/off input feature of the converter allows external
Output load current.
circuitry to turn the converter on or off. Active-high remote on/off is
Air velocity (forced or natural convection).
Mounting orientation of converter PCB with respect to the Airflow.
available as standard. The VPOL5A-5-SIP series converters are turned
on if the remote on/off pin is high, or left open or floating. Setting the
Motherboard PCB design, especially ground and power planes.
pin low will turn the converter off. The signal level of the remote on/off
These can be effective heat sinks for the converter.
input is defined with respect to ground. If not using the remote on/off
5.2 Over-Temperature Protection (OTP)
pin, leave the pin open (module will be on). The part number suffix “N”
The VPOL5A-5-SIP Series converters are equipped with non-latching
is Negative remote on/off version. The unit is guaranteed off over the
over-temperature protection. A te mperature sensor monitors the
full temperature range if this voltage level exceeds 2.8 Vdc. The
temperature of the hot spot (typically, top switch). If the temperature
converters are turned on If the on/off pin input is low or left open. The
exceeds a threshold of 120 C (typical) the converter will shut down,
recommended SIP remote on/off drive circuit as shown as figure 3, 4.
disabling the output. When the temperature has decreased the
converter will automatically restart.
The over-temperature condition can be induced by a variety of reasons
such as external overload condition or a system fan failure.
+Vin
5.3 Output Voltage Adjustment
Section 7.8 describes in detail as to how to trim the output voltage with
respect to its set point. The output voltage on all models is trimmable
in the range 0.75 – 3.63 Vdc.
On/Off
Control
+Vo
Remote On/Off
Q1
SIP Series
5.4 Safe Operating Area (SOA)
Figure 2 provides a graphical representation of the Safe Operating
Common
Area (SOA) of the converter. This representation assumes ambient
operating conditions such as airflow are met as per thermal guidelines
Common
Figure 3. Positive Remote on/off Input Drive Circuit
provided in Sections 7.2 and 7.3.
Vo
+Vin
Q1
VOLTAGE (V)
Vo,nom
On/Off
Control
Safe Operating Area
+Vo
SIP Series
Remote On/Off
Common
Common
Figure 4. Negative Remote On/Off Input Drive Circuit
CURRENT (A)
Io,max Io,CL Io
Figure 2. Maximum Output Current Safe Operating Area
5.7 UVLO (Under-Voltage Lockout)
The voltage on the Vcc pin determines the start of the operation of the
Converter. When the input Vcc rises and exceeds about 2.0 V the
converter initiates a soft start. The UVLO function in the converter has
a hysterosis (about 100mV) built in to provide noise immunity at startup.
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
page
6 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
6. Safety
6.1 Input Fusing and Safety Considerations.
Agency Approvals: The power supply shall be submitted to and
receive formal approval from the following test agencies.
W ind
Tunnel
25.4(1.0)
Bakelite
1.The power supply shall be approved by a nationally recognized
rd
testing laboratory to UL/CSA 60950 3 Edition (North America) and
EN60950 (International)
Power Module
2. CB Certificate from an internationally recognized test house in
accordance with EN 60950.
The VPOL5A-5-SIP series converters do not have an internal fuse.
However, to achieve maximum safety and system protection, always
use an input line fuse. The safety agencies require a time-delay fuse
76.2(3.0)
with a maximum rating of 10 A.
7. Applications
Thermocuple Location
for measuring
ambient temperature
and airflow
7.1 Layout Design Challenges.
In optimizing thermal design the PCB is utilized as a heat sink. Also
some heat is transferred from the SIP module to the main board
12.7(0.5)
through connecting pins. The system designer or the end user must
ensure that other components and metal in the vicinity of the
VPOL5A-5-SIP series meet the spacing requirements to which the
system is approved.
Low resistance and low inductance PCB layout traces are the norm
and should be used where possible. Due consideration must also be
given to proper low impedance tracks between power module, input
and output grounds. The recommended SIP footprint as shown in
figure 5.
Note : Dimensions are in millimeters and (inches)
Figure 6. Thermal Test Setup
7.3 Thermal Considerations
The power module operates in a variety of thermal environments;
however, sufficient cooling should be provided to help ensure reliable
1.1mm PLATED THROUGH HOLE
1.6mm PAD SIZE
0.20(5.1)
Air
flow
LAYOUT PA TTERN
TOP VIEW
0.24(6.1)
All Dimmension In Inches(mm)
Tolerance :
.XX= ±0.02 ( ± 0.5 )
.XXX= ±0.010 ( ± 0.25 )
Figure 5. Recommended SIP Footprint
7.2 Convection Requirements for Cooling
operation of the unit. Heat is removed by conduction, convection, and
radiation to the surrounding environment. The thermal data presented
is based on measurements taken in a set-up as shown in Figure7.
Figures 8 and 9 represent the test data. Note that the airflow is parallel
to the long axis of the module as shown in Figure7 for the VPOL5A-5-SIP.
The temperature at either location should not exceed 110 °C. The
output power of the module should not exceed the rated power for the
module (VO, set x IO, max). The test setup shown in Figure 7 and EUT
need to solder on 33mm x 40.38mm(1.300'' x 1.59'') test pcb.
Note that airflow is parallel to the long axis of the module as shown in Fig7.
To predict the ap proximate cooling needed for the module, refer to the
Power De-rating curves in Figures 10 to 13. These derating curves are
approximations of the ambient temperatures and airflows required to
keep the power module temperature below its maximum rating. Once
the module is assembled in the actual system, the module’s
temperature should be checked as shown in Figure 6 to ensure it does
not exceed 110°C.
Proper cooling can be verified by measuring the power module’s
temperature at Q1-pin 6 as shown in Figure 6.
Figure 7. Temperature Measurement Location for SIP
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
TYPICAL POWER DERATING FOR 5Vin 3.3Vout
6.0
Output Current(A)
5.0
4.0
0LFM
100LFM
2.0
200LFM
1.0
0.0
0
10
20
30
40
50
7 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
3.0
page
60
70
80
90
100
Ambient Temperature(o C)
Figure 2. Typical Power De-rating for 5V IN 3.3Vout
NOTE:
1. specific input & output derating curves available, please
contact CUI INC for detail
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382
For more information, please visit the product page.
rev.
page
8 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
7.5 Efficiency vs Load Curves
VPOL5A-5-SIP Vo=3.3V (Eff Vs Io)
VPOL5A-5-SIP Vo=2.5V (Eff Vs Io)
95%
95%
Efficincy (%)
100%
Efficincy (%)
100%
90%
90%
85%
85%
4.5V
5.0V
5.5V
80%
75%
3.0V
5.0V
5.5V
80%
75%
70%
70%
0
0.5
1
1.5
2
2.5
3
3.5
Current Load (A)
4
4.5
5
0
1
1.5
2
2.5
3
3.5
Current Load (A)
4
4.5
5
VPOL5A-5-SIP Vo=1.5V (Eff Vs Io)
VPOL5A-5-SIP Vo=1.8V (Eff Vs Io)
100%
95%
95%
Efficincy (%)
100%
Efficincy (%)
0.5
90%
90%
85%
85%
3.0V
5.0V
5.5V
80%
75%
3.0V
5.0V
5.5V
80%
75%
70%
70%
0
0.5
1
1.5
2
2.5
3
3.5
Current Load (A)
4
4.5
5
0
VPOL5A-5-SIP Vo=1.2V (Eff Vs Io)
0.5
1
1.5
2
2.5
3
3.5
Current Load (A)
4
4.5
5
VPOL5A-5-SIP Vo=0.75V (Eff Vs Io)
100%
100%
95%
95%
Efficincy (%)
Efficincy (%)
90%
90%
85%
80%
85%
3.0V
5.0V
5.5V
80%
75%
3.0V
5.0V
5.5V
75%
70%
65%
70%
60%
0
0.5
1
1.5
2
2.5
3
3.5
Current Load (A)
20050 SW 112th Ave. Tualatin, Oregon
4
4.5
5
0
0.5
1
1.5
2
2.5
3
3.5
Current Load (A)
97062 phone 503.612.2300 fax 503.612.2382
4
4.5
5
For more information, please visit the product page.
rev.
The SIP converters must be connected to a low ac source impedance.
To avoid proble ms with loop stability source inductance should be low.
Line.reg
pins to de-couple distribution inductance. However, the external input
capacitors are chosen for suitable ripple handling capability. Low ESR
polymers are a good choice. They have high capacitance, high ripple
Current Meter
measurement methods for ripple current. Input reflected-ripple current
measured at the input of the module.
A
Power
Supply
+Vin
+Vin
2*100uF
Tantalum
+
V 100uF
Voltage Meter
VPOL5A-5-SIP
Series
VPOL5A-5-SIP
Common
Figure 10. Input Reflected-Ripple Test Setup
7.7 Test Set-Up
The basic test set-up to measure parameters such as efficiency and
load regulation is shown in Figure 11. Things to note are that this
converter is non-isolated, as such the input and output share a
common ground. These grounds should be connected together via low
impedance ground plane in the application circuit. When testing a
converter on a bench set-up, ensure that -Vin and -Vo are connected
together via a low impedance short to ensure proper efficiency and
load regulation measurements are being made. When testing the VInfinity’s VPOL5A-5-SIP series under any transient conditions please
ensure that the transient response of the source is sufficient to power
the equipment under test. We can calculate the
Efficiency
Load regulation and line regulation.
The value of efficiency is defined as:
Vo x Io
x 100%
Vin x Iin
Where:
Vo is output voltage,
Io is output current,
Vin is input voltage,
Iin is input current.
The value of load regulation is defined as:
Load .reg =
VFL _ VNL
x 100%
VNL
20050 SW 112th Ave. Tualatin, Oregon
V
Common
Figure 11. VPOL5A-5-SIP Series Test Setup
220uF
ESR<0.1ohm
ç=
A
+Vo
+Sense
Common
To Oscilloscope
Supply
VHL _ VLL
x 100%
VLL
VLL is the output voltage of minimum input voltage at full load.
be avoided. Circuit as shown in Figure 10 represents typical
is measured with a simulated source Inductance of 1μH. Current is
=
Where: VHL is the output voltage of maximum input voltage at full load.
rating and low ESR (typical <100mohm). Electrolytic capacitors should
+
08/2007
The value of line regulation is defined as:
Also, the input capacitors should be placed close to the converter input
Power
date
VNL is the output voltage at no load
7.6 Input Capacitance at the Power Module
1uH
9 of 10
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
L1
page
97062 phone 503.612.2300 fax 503.612.2382
Load
For more information, please visit the product page.
rev.
page
10 of 10
date
08/2007
DESCRIPTION: point of load converter
PART NUMBER: VPOL5A-5-SIP
7.8 VPOL5A-5-SIP Series Output Voltage Adustment.
7.9 Output Ripple and Noise Measurement
The output Voltage of the VPOL5A-5-SIPS33A can be adjusted in the
The test set-up for noise and ripple measurements is shown in Figure
range 0.75V to 3.63V by connecting a single resistor on the
18. a coaxial cable with a 50ohm termination was used to prevent
motherboard (shown as Rtrim) in Figure 12v. When Trim resistor is not
impedance mismatch reflections disturbing the noise readings at
connected the output voltage defaults to 0.75V
higher frequencies5^
+Vin
+Vin
+Vo
R-Load
VPOL5A-5-SIP
Common
R-Load
Common
Common
Figure 13. Output Voltage Ripple and Noise Measurement Set-Up
7.10 Output Capacitance
Figure 12. Trim-up Voltage Setup
CUI INC’s VPOL5A-5-SIP series converters provide unconditional
The value of Rtrim-up defined as:
Where:
1uF
Ceramic
Test Jack
R trim-up
Rtrim = (
10uF
Tant.
VPOL5A-5-SIP
Trim
Common
+Vo
stability with or without external capacitors. For good transient
21070 _
5110 )
Vo _ 0.75
response low ESR output capacitors should be located close to the
point of load.
For high current applications point has already been made in layout
Rtrim-up is the external resistor in ohm,
considerations for low resistance and low inductance tracks.
Vo is the desired output voltage
Output capacitors with its associated ESR values have an impact on
To give an exa mple of the above calculation, to set a voltage of 3.3
loop stability and bandwidth. CUI INC’s converters are designed to
work with load capacitance up-to 3,000 μF. It is rec ommended that any
Vdc, Rtrim is given by:
additional capacitance, Maximum 3,000 μF and low ESR, be
Rtrim = (
21070 _
5110 )
Vo _ 0.75
connected close to the point of load and outside the remote
compensation point.
Rtrim = 3153 ohm
8. Mechanical Outline Diagrams
For various output values various resistors are calculated and provided
8.1 SIP/SMT05 Mechanical Outline Diagrams
in Table 3 for co nvenience.
Vo,set (V)
0.75
1.20
1.50
1.80
2.00
2.50
3.30
3.63
Dimensions are in millimeters and inches
Rtrim (Kohm)
Open
41.71
22.98
14.96
11.75
6.93
3.15
2.20
Table 3 – Trim Resistor Values
Tolerance: x.xx ±0.02 in. (0.5mm) , x.xxx ±0.010 in. (0.25 mm) unless
otherwise noted
SIZE SIP05
0.90(22.9)
PIN CONNECTION
0.22(5.6)Max.
Pin
1 2 3
4 5
0.400(10.16)
0.14(3.6)
0.025(0.64)
0.100(2.54)
0.200(5.08)
0.700(17.78)
0.025(0.64)
FUNCTION
1
+Output
2
Trim
3
Common
4
+V Input
5
On/Off
0.19(4.7)
0.800(20.32)
Figure 14 VPOL5A-5-SIP Mechanical Outline Diagram
20050 SW 112th Ave. Tualatin, Oregon
97062 phone 503.612.2300 fax 503.612.2382