STEP-DOWN SWITCHING VOLTAGE REGULATOR HERMETIC ISOLATED PACKAGE A

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STEP-DOWN SWITCHING VOLTAGE REGULATOR HERMETIC ISOLATED PACKAGE A

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OM1575 Series OMH1575 Series
STEP-DOWN SWITCHING VOLTAGE REGULATOR HERMETIC ISOLATED PACKAGE
Amp, 12V, Adjustable Output Voltage Versions MO-078 Metal Package
Similar Industry Standard LM1575 Available 12V, 15V, Adjustable Versions Output Wide Input Voltage Range, Fixed Frequency Internal Oscillator High Efficiency Hermetic Metal Packages
DESCRIPTION
This series regulators monolithic integrated circuits designed active functions step down, buck buck/boost regulator. requires only four readily available standard components complete converter design Amp. Current limiting thermal shutdown features fully protect device against overstress. hermetic package ideally suited those critical environments requiring high reliability over wide operating temperature range.
ABSOLUTE MAXIMUM RATINGS 25°C
Maximum Supply Voltage OM1575. OMH1575 ON/OFF Input Voltage -0.3 Output Voltage Ground (Steady State) Power Dissipation. Internally Limited Operating Temperature Range -55°C 150°C Storage Temperature Range -65°C 150°C Thermal Resistance, RqJC 2.4°C/W Lead Soldering Temperature seconds). 260°C
BLOCK DIAGRAM
INPUT Feedback Internal Resistors Fixed Options Only ON/OFF ON/OFF
RESET
PROTECTION Output
OM1575 OMH1575 Series
Unless otherwise specified options; 12V; models; VOUT ADJ, 0.2A 25°C. rated Series. Test Conditions Parameter OM1575-05 Symbol Rated OM1575-12 Rated OM1575-15 Rated Feedback Voltage VOUT OM1575-A Feedback Bias Current 0.2A Over Temp. Efficiency/Option Switching Frequency Saturation Voltage(1) Maximum Duty Cycle (On)(3) Current Limit Peak Current Output Leakage Current Output Output Quiescent Current Over Temp. Rated Over Temp. Over Temp. Over Temp. On/Off Input Current On/Off (Off) On/Off (Off) 0.2A Over Temp. VSAT Over Temp. Peak Current 3µsec Over Temp. Rated 0.2A Over Temp. 0.2A Over Temp. 0.2A Over Temp. 0.2A Over Temp. MIN. 4.95 4.80 4.85 11.88 11.52 11.64 14.85 14.40 14.55 1.217 1.193 1.205 TYP. MAX. 5.05 5.20 5.15 12.12 12.48 12.36 15.15 15.60 15.45 1.243 1.267 1.255 UNIT Limits
ELECTRICAL CHARACTERISTICS
Standby Quiescent Current (On/Off On/Off Logic Input Level VOUT VOUT Option
ISTBY
Notes: Over Temperature: -55°C 150°C. Output sourcing current resistive load, inductor capacitor. Feedback +1.0V. Feedback parameters 100% tested during production. Consult factory more information.
OM1575 OMH1575 Series
OPERATIONAL DATA
Dropout Voltage
VOUT RIND
Minimum Operating Voltage
Input Voltage 200mA VOUT 1.23V
VOUT
200mA
Junction Temperature (°C)
Junction Temperature (°C)
Normalized Feedback Voltage (mV)
Line Regulation (Adjustable Version Only)
Feedback Current (nA) Normalized 200mA, VOUT 25°C
Feedback Current
Input Voltage
Junction Temperature (°C)
Normalized Feedback Voltage (mV)
Normalized Feedback Voltage (Adjustable Version Only)
200mA Normalized 25°C
Feedback Voltage Change (mV)
Feedback Voltage Duty Cycle (Adjustable Version Only)
200mA
Junction Temperature (°C)
Duty Cycle
OM1575 OMH1575 Series
OPERATIONAL DATA
Supply Current Duty Cycle
200mA Supply Current (mA) LOAD 200mA Input Voltage LOAD Measured Ground 25°C, VOUT
Supply Current
Supply Current (mA)
Duty Cycle
Current Limit
Saturation Voltage
Switch Saturation Voltage
Output Current
-55°C
25°C 150°C
Junction Temperature (°C)
Switch Current
Efficiency VOUT
Efficiency
Standby Quiescent Current (µA)
Standby Quiescent Current
VON/OFF Junction Temperature (°C)
200mA 200mA VOUT
Input Voltage
OM1575 OMH1575 Series
Catch Diode output must capable sustained short, rating must above ultra fast diode with soft recovery characteristics Schottky will adequate. major impact Schottky versus ultra fast efficiency. Schottkys will provide approximately improvement output voltage below 12V, whereas above difference will become less significant. Breakdown rating must excess margin. Input Capacitor value shown will adequate most applications. Ripple voltage switching frequency caused input capacitor supplying load current during time power switch. switching type capacitor will minimize ripple acceptable level. Layout short connections with central point ground prevent improper operation caused stray inductance ground loops. Output Capacitor Ripple voltage VOUT directly related value COUT internal resistance COUT. Output noise lowered increasing COUT selecting capacitor with lower ESR. must approximately 0.07 above maintain stability, otherwise raise value COUT.
BUCK MODE FIXED VOLTAGE
68µF RESET 330µH COUT 330µF
PROTECTION
BUCK MODE ADJUSTABLE VOLTAGE
68µF RESET 330µH 330µF COUT
PROTECTION
above fixed adjustable voltage selections will adequate most applications output currents from 150mA 1.0A. Applications VOUT below above require component adjustment maximum performance; please contact factory application assistance.
OM1575 OMH1575 Series
Switching Spikes Switching spikes will also occur distributive capacitance across turns inductor when combined with output capacitor series inductance (ESL). Reduction level below switching ripple achieved using post filter, shown Switching Spike Reduction Schematic.
SWITCHING SPIKE REDUCTION
+VIN INPUT OUTPUT 1µH+ VOUT 10µF+ TANT
ON/OFF
COUT
TYPICAL APPLICATION
TURN-ON DELAY WITH SPIKE FILTER
FEEDBACK OUTPUT 0.47µF 3.0µF 2.2k 1N914 Regulated Output
COUT
Spike filter reduces input noise, causing false triggering delay.
OM1575 OMH1575 Series
TYPICAL APPLICATIONS
TYPICAL BUCK SHUTDOWN
FEEDBACK Unregulated Input ON/OFF Shutdown Input TTL, CMOS, etc. +VIN OUTPUT COUT Regulated Output
FEEDBACK Unregulated Input +VIN 100k Shutdown 100k Input 100k ON/OFF OUTPUT COUT Regulated Output
TURN-ON DELAY
OUTPUT 0.47µF 3.0µF 1N914 COUT Regulated Output
+VIN
Circuit allows fully charged before start-up, provides supply hi-peak current instead input supply.
OM1575 OMH1575 Series
TYPICAL APPLICATIONS
INVERTING BUCK/BOOST SHUTDOWN
FEEDBACK Unregulated Input 220k 470k Shutdown Input 470k 470k 330k Regulated Output +VIN ON/OFF OUTPUT COUT
FEEDBACK Unregulated Input +VIN ON/OFF 220V Shutdown Input 100k 470k COUT OUTPUT
Regulated Output
UNDER VOLTAGE LOCKOUT
Unregulated Input
FEEDBACK +VIN ON/OFF OUTPUT
Regulated Output
COUT
Regulator will until point reached.
VO(ON) 3VBE
OM1575 OMH1575 Series
TYPICAL APPLICATIONS
INVERTING BUCK/BOOST
47µF RESET
PROTECTION
100µH
COUT 330µF 250mA
250mA
+12V 47µF RESET
PROTECTION
47µH
COUT 200µF
COMMON
+12V 100mA
100mA
Inverting buck/boost operation different topology operation than buck. This difference reduces output current capability device, that inductor must supply load current during time power switch off: Maximum output current approximately: IOUT 1.3/2 oeVOoe/ VIN) Component requirement stress very similar buck with exceptions: Catch diode breakdown must greater than oeVOUToe Input capacitor larger increased peak current during switch turn Power dissipation OM1575 approximately: [oeVOoe (oeVOoe+ VIN)] oeVOoe/ VIN) Please contact factory additional assistance when using buck/boost topology.
OM1575 OMH1575 Series
MECHANICAL OUTLINE
.695 .685 .165 .155 .835 .815 .270 .240 .045 .035 .707 .697
CONNECTION
MO-078 PACKAGE
.550 .530 .092 MAX.
.750 .500 .035 .025
.005
.100 TYP.
.140 TYP.
Feedback ON/OFF
Z-TAB PACKAGE
.250 PLCS
.695 .685 .550 .285 .530 .750 .500 .100
.045 .035
.250
.005 .035 .025
.270 MAX.
Feedback ON/OFF
ORDERING INFORMATION
EXAMPLE: 1575 Volt, Package With Screening PART VOLTAGE CASE NUMBER LEVEL STYLE SCREENING OM1575 Volt MO-078 OMH1575 Volt Z-Tab Volt Both Packages screening Adjustable Isolated section
Crawford Street, Leominster, 01453 (508) 534-5776 (508) 537-4246

STEP-DOWN SWITCHING VOLTAGE REGULATOR HERMETIC ISOLATED PACKAGE A

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