ATH18K12 ASTEC | Alldatasheet

Document overview

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Technical content

Features

  • Up to 18 A Output Current
  • 12-V Input Voltage
  • Wide-Output Voltage Adjust (1.2 V to 5.5 V)
  • Efficiencies up to 95 %
  • 195 W/in³ Power Density
  • On/Off Inhibit
  • Output Voltage Sense
  • Margin Up/Down Controls
  • Under-Voltage Lockout Rset = Resistor to set the desired output voltage (see spec. table for values). Cin = Required electrolytic 560 µF Cout = Optional 330 µF electrolytic
  • Auto-Track™ Sequencing
  • Output Over-Current Protection (Non-Latching, Auto-Reset)
  • Over-Temperature Protection
  • Surface Mountable
  • Operating Temp: –40 to +85 °C
  • DSP Compatible Output Voltages
  • IPC Lead Free 2
  • Point-of-Load Alliance (POLA) Compatible PTH12020W (Top View) Margin Up Margin Down VIN L O A D CIN 560 µF (Required) + COUT 330 µF (Optional) Inhibit GND GND VOUT Vo Sense Track 10 9 8 543 RSET (Required)

0.1 W, 1 %

Auto-Track™ Sequencing Pin Configuration Pin Function

1 GND

2 Vin

3 Inhibit *

4 Vo Adjust

5 Vo Sense

6 Vout

7 GND

8 Track

9 Margin Down *

10 Margin Up *

  • Denotes negative logic: Open = Normal operation Ground = Function active NOMINAL SIZE = 1.5 in x 0.87 in (38,1 mm x 22,1 mm)

Description

The ATH18K12 series of non-isolated power modules offers OEM designers a combination of high performance, small footprint, and industry leading features. As part of a new class of power modules, these products provide designers with the flexibility to power the most complex multi-processor digital systems using off-the-shelf catalog parts. The series employs double-sided surface mount construction and provides high- performance step-down power conversion for up to 18 A of output current from a 12-V input bus voltage. The output volt- age of the ATH18K12 can be set to any value over the range, 1.2 V to 5.5 V, using a single resistor. This series includes Auto-Track™. Auto-Track™ simplifies the task of supply voltage sequencing in a power system by enabling modules to track each other, or any external voltage, during power up and power down. Other operating features include an on/off inhibit, output voltage adjust (trim), and margin up/down controls. To ensure tight load regulation, an output voltage sense is also provided. A non-latching over-current trip and over-temperature shutdown provides load fault protection. Target applications include complex multi-voltage, multi-processor systems that incorporate the industry’s high-speed DSPs, micro-processors and bus drivers. ATH18K12-9S

North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Pin Descriptions Vin: The positive input voltage power node to the mod- ule, which is referenced to common GND. Vout: The regulated positive power output with respect to the GND node. GND: This is the common ground connection for the Vin and Vout power connections. It is also the 0 VDC reference for the control inputs. Inhibit: The Inhibit pin is an open-collector/drain negative logic input that is referenced to GND. Applying a low- level ground signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control is active, the input current drawn by the regula- tor is significantly reduced. If the Inhibit pin is left open-circuit, the module will produce an output when- ever a valid input source is applied. Vo Adjust: A 0.1 W, 1 % tolerance (or better) resistor must be connected directly between this pin and pin 7 (GND) pin to set the output voltage to the desired value. The set point range for the output voltage is from 1.2 V to 5.5 V. The resistor required for a given output voltage may be calculated from the following formula. If left open circuit, the module output will default to its lowest output voltage value. For further information on output voltage adjustment consult the related application note. R set = 10 k · 0.8 V – 1.82 k Vout – 1.2 V The specification table gives the preferred resistor values for a number of standard output voltages. Vo Sense: The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For optimal voltage accuracy Vo Sense should be connected to Vout. It can also be left disconnected. Track: This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage from 0 V up to the nominal set-point voltage. Within this range the output will follow the voltage at the Track pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules pow- ered from the same input bus. If unused, the input may be left unconnected. Note: Due to the under-voltage lockout feature, the output of the module cannot follow its own input voltage during power up. For more information, consult the related application note. Margin Down: When this input is asserted to GND, the output voltage is decreased by 5% from the nominal. The input requires an open-collector (open-drain) interface. It is not TTL compatible. A lower percent change can be accomodated with a series resistor. For further infor- mation, consult the related application note. Margin Up: When this input is asserted to GND, the output voltage is increased by 5%. The input requires an open-collector (open-drain) interface. It is not TTL compatible. The percent change can be reduced with a series resistor. For further information, consult the related application note.

Ordering Information

REVISION 00 (30SEP2003) ATH18K12 Series—12-V Input 18-A, 12-V I nput Non-Isolated Wide-Output Adjust Power Module ** Auto-Track is a trademark of Texas Instruments, Inc. Input Voltage Output Voltage Output Current Model Number 10.8V to 13.2V 1.2V1 to 5.5V 18A ATH18K12-9(S)(J) Options: “-J” - Through-hole Termination, Tray Packaging “-SJ” - SMT Termination, Tray Packaging “-S” - SMT Termination, T&R Packaging Notes: 1Preset output voltage is 1.2V; externally adjustable to 5.5V

North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Environmental & Absolute Maximum Ratings (Voltages are with respect to GND) Characteristics Symbols Conditions Min Typ Max Units Track Input Voltage V track –0.2 — Vin V Operating Temperature Range Ta Over Vin Range –40 — 85 °C Solder Reflow Temperature T reflow Surface temperature of module body or pins 215 (i) °C Storage Temperature Ts — –40 — 125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 — 500 — G’s1 msec, ½ Sine, mounted Mechanical Vibration Mil-STD-883D, Method 2007.2 — 20 — G’s20-2000 Hz Weight — — 7 — grams Flammability — Meets UL 94V-O Notes: (i) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products.” Specifications (Unless otherwise stated, T a =25 °C, V in =12 V, Vout =3.3 V, Cin =560 µF, Cout =0 µF, and Io =Iomax) PTH12020W Characteristics Symbols Conditions Min Typ Max Units Output Current Io 60 °C, 200 LFM airflow 0 — 18 (1) A25 °C, natural convection 0 — 18 (1) Input Voltage Range Vin Over Io range 10.8 — 13.2 V Set-Point Voltage Tolerance Vo tol — — ±2 (2) %Vo Temperature Variation Δ Regtemp –40 °C <Ta < +85 °C — ±0.5 — %V o Line Regulation Δ Regline Over Vin range — ±5 — mV Load Regulation Δ Regload Over Io range — ±5 — mV Total Output Variation Δ Regtot Includes set-point, line, load, — — ±3 (2) %Vo–40 °C ≤ Ta ≤ +85 °C Efficiency η Io =10 A RSET = 280 Ω Vo = 5.0 V — 95.0 — RSET = 2.0 kΩ Vo = 3.3 V — 93.5 — RSET = 4.32 kΩ Vo = 2.5 V — 92.2 — RSET = 8.06 kΩ Vo = 2.0 V — 90.8 — % RSET = 11.5 kΩ Vo = 1.8 V — 90.0 — RSET = 24.3 kΩ Vo = 1.5 V — 88.5 — RSET = open cct.Vo = 1.2 V — 86.5 — Vo Ripple (pk-pk) Vr 20 MHz bandwidth Vo ≤ 2.5 V — 32 — mVpp Vo >2.5 V — 1 — % Vo Over-Current Threshold Io trip Reset, followed by auto-recovery — 30 — A Transient Response 1 A/µs load step, 50 to 100 % I omax, Cout =330 µF ttr Recovery Time — 70 — µSec Δ Vtr Vo over/undershoot — 130 — mV Margin Up/Down Adjust Δ Vo margin — ± 5 — % Margin Input Current (pins 9 /10) IIL margin Pin to GND — – 8 (3) — µA Track Input Current (pin 8) IIL track Pin to GND — — –0.13(4) mA Track Slew Rate Capability dVtrack/dt  Vtrack – Vo ≤ 50 mV and Vtrack < Vo(nom) 5 — — V/ms Under-Voltage Lockout UVLO Vin increasing — 9.7 10.4 VVin decreasing 8.8 9.2 — Inhibit Control (pin3) Referenced to GND Input High Voltage VIH Vin –0.5 — Open (4) V Input Low Voltage VIL –0.2 — 0.5 Input Low Current IIL inhibit Pin to GND — –0.24 — mA Input Standby Current Iin inh Inhibit (pin 3) to GND, Track (pin 8) open — 5 — mA Switching Frequency ƒs Over Vin and Io ranges 260 320 380 kHz External Input Capacitance Cin 560 (5) — — µF External Output Capacitance Cout 0 330 (6) 10,000 µF Reliability MTBF Per Bellcore TR-332 5.3 — — 106 Hrs50 % stress, Ta =40 °C, ground benign Notes: (1) See SOA curves or consult factory for appropriate derating. (2) The set-point voltage tolerance is affected by the tolerance and stability of R SET. The stated limit is unconditionally met if R SET has a tolerance of 1 %, with 200 ppm/°C or better temperature stability. (3) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc. (4) This control pin has an internal pull-up to the input voltage Vin. If it is left open-circuit the module will operate when input power is applied. A small low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note. (5) A 560 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 800 mA rms of ripple current. (6) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response. REVISION 00 (30SEP2003) ATH18K12 Series—12-V Input 18-A, 12-V I nput Non-Isolated Wide-Output Adjust Power Module

North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. ´ 4 in. double-sided PCB with 1 oz. copper. Typical Characteristics Characteristic Data; Vin =12 V (See Note A) Efficiency vs Load Current Power Dissipation vs Load Current Output Ripple vs Load Current Safe Operating Area; Vin =12 V (See Note B) Output Voltage =5 V Output Voltage =2.5 V Output Voltage =1.8 V 100 0 3 6 9 12 15 18 Iout - Amps Ripple - mV 5.0 V 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V VOUT 0 5 10 15 Iout - Amps Pd - Watts 5.0 V 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V VOUT 0 3 6 9 12 15 18 Iout (A) Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat conv Airflow 0 3 6 9 12 15 18 Iout (A) Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat conv Airflow 0 3 6 9 12 15 18 Iout (A) Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat conv Airflow REVISION 00 (30SEP2003) ATH18K12 Series—12-V Input 18-A, 12-V I nput Non-Isolated Wide-Output Adjust Power Module 100 0 3 6 9 12 15 18 Iout - Amps Efficiency - % 5.0 V 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V VOUT

North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Adjusting the Output Voltage of the ATH18K12 Wide-Output Adjust Power Module The Vo Adjust control (pin 4) sets the output voltage of the ATH18K12 product. The adjustment range is from 1.2 V to 5.5 V. To adjust the output voltage above 1.2 V a single external resistor, Rset, must be connected directly between the Vo Adjust and GND pins 1. Table 1-1 gives the preferred value for the external resistor for a number of standard voltages, along with the actual output voltage that this resistance value provides. For other output voltages the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 1-2. Figure 1-1 shows the placement of the required resistor. Rset = 10 kΩ · 0.8 V – 1.82 kΩVout – 1.2 V Figure 1-1; Vo Adjust Resistor Placement Notes: 1. Use a 0.1 W resistor. The tolerance should be 1 %, with temperature stability of 100 ppm/°C (or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 7 using dedicated PCB traces. 2. Never connect capacitors from Vo Adjust to either GND or Vout. Any capacitance added to the Vo Adjust pin will affect the stability of the regulator. PTH12020W 1 4 COUT 330µF GND VOUT VO Sense [Note 3] VO AdjGND VO Sense VOUT RSET

1.200 Open

1.225 318 κΩ 1.250 158 κΩ 1.275 105 κΩ 1.300 78.2 κΩ 1.325 62.2 κΩ 1.350 51.5 κΩ 1.375 43.9 κΩ 1.400 38.2 κΩ 1.425 33.7 κΩ 1.450 30.2 κΩ 1.475 27.3 κΩ 1.50 24.8 κΩ 1.55 21 κΩ 1.60 18.2 κΩ 1.65 16 κΩ 1.70 14.2 κΩ 1.75 12.7 κΩ 1.80 11.5 κΩ 1.85 10.5 κΩ 1.90 9.61 κΩ 1.95 8.85 κΩ 2.00 8.18 κΩ 2.05 7.59 κΩ 2.10 7.07 κΩ 2.15 6.6 κΩ 2.20 6.18 κΩ 2.25 5.8 κΩ 2.30 5.45 κΩ 2.35 5.14 κΩ 2.40 4.85 κΩ 2.45 4.85 κΩ 2.50 4.33 κΩ 2.55 4.11 κΩ 2.60 3.89 κΩ 2.65 3.7 κΩ 2.70 3.51 κΩ Vout (Standard) Rset (Pref’d Value) Vout (Actual) 5 V 280 Ω 5.009 V 3.3 V 2 κΩ 3.294V 2.5 V 4.32 κΩ 2.503 V 2 V 8.06 κΩ 2.010V 1.8 V 11.5 κΩ 1.801 V 1.5 V 24.3 κΩ 1.506 V 1.2 V Open 1.200 V Table 1-1; Preferred Values of Rset for Standard Output Voltages ATH18K12 Series Table 1-2; Output Voltage Set-Point Resistor Values Va Req’d Rset Va Req’d Rset 2.75 3.34 κΩ 2.80 3.18 κΩ 2.85 3.03 κΩ 2.90 2.89 κΩ 2.95 2.75 κΩ 3.00 2.62 κΩ 3.05 2.5 κΩ 3.10 2.39 κΩ 3.15 2.28 κΩ 3.20 2.18 κΩ 3.25 2.08 κΩ 3.30 1.99 κΩ 3.35 1.9 κΩ 3.40 1.82 κΩ 3.45 1.74 κΩ 3.50 1.66 κΩ 3.55 1.58 κΩ 3.6 1.51 κΩ 3.7 1.38 κΩ 3.8 1.26 κΩ 3.9 1.14 κΩ 4.0 1.04 κΩ 4.1 939 Ω 4.2 847 Ω 4.3 761 Ω 4.4 680 Ω 4.5 604 Ω 4.6 533 Ω 4.7 466 Ω 4.8 402 Ω 4.9 342 Ω 5.0 285 Ω 5.1 231 Ω 5.2 180 Ω 5.3 131 Ω 5.4 85 Ω 5.5 41 Ω ATH18K12-9S

North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Table 2-1: Input/Output Capacitors ATH18K12 Series (1) N/R –Not recommended. The voltage rating does not meet the m inimum operating limits. Tantalum Capacitors Tantalum type capacitors can be used for the output but only the AVX TPS, Sprague 593D/594/595 or Kemet T495/T510 series. These capacitors are recommended over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution the TAJ series by AVX is not recommended. This series has considerably higher ESR, reduced power dissipation, and lower ripple current capability. The TAJ series is also less reliable than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended for applications where ambient temperatures fall below 0°C. Ceramic Capacitors Ceramic capacitors can be substituted for electrolytic types on the output bus with the minimum capacitance for reducd ripple and improved transient response. Capacitor Table Table 2-1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The number of capacitors required at both the input and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are available with comparable specifications. Those listed are for guidance. The RMS ripple current rating and ESR (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long-term reliability. ATH18K12: Capacitor Recommendations Input Capacitor The recommended input capacitor(s) is determined by the 560 µF minimum capacitance, and 800 mArms mini- mum ripple current rating. Ripple current and <100 m Ω equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of 2 × (max. DC voltage + AC ripple). This is standard practice for tantalum capaci- tors to insure reliability. Tantalum capacitors are not recommended on the input bus. Output Capacitors (Optional) The recommended ESR of the output capacitor is equal to or less than 150 mΩ . Electrolytic capacitors have marginal ripple performance at frequencies greater than 400 kHz but excellent low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to im- prove the transient response and reduce any high frequency noise components apparent during higher current excur- sions. Preferred low-ESR capacitor part numbers are identified in Table 2-1. Capacitor Vendor/ Series Capacitor Characteristics Quantity Working Voltage Value (µF) (ESR) Equivalent Series Resistance 105°C Maximum Ripple Current(Irms) Physical Size(mm) Input Bus Optional Output Bus Vendor Part Number Panasonic FC (Radial) FK (Surface Mt) 25 V 25 V 25 V 35 V 330 560 1000 680 0.090 Ω 0.065 Ω 0.060 Ω 0.060 Ω 755 mA 1205 mA 1100mA 1100 mA 10× 12.5 12.5× 15 12.5× 13.5 12.5× 13.5 EEUFC1E331 EEUFC1E561S EEVFK1E102Q EEVFK1V681Q United Chemi-Con FX LXZ Series 16 V 16 V 25V 330 330 680 0.018 Ω 0.090 Ω 0.068 Ω 4500 mA 760 mA 1050 mA 10× 10.5 10× 12.5 10× 16 16FX330M LXZ25VB331M10X12LL LXZ16VB681M10X16LL Nichicon PM Series 25 V 25 V 35 V 560 680 560 0.060 Ω 0.055 Ω 0.048 Ω 1060 mA 1270 mA 1360 mA 12.5× 15 16× 15 16× 15 UPM1E561MHH6 UPM1E681MHH6 UPM1V561MHH6 Os-con: SP SVP (Surface Mt) 16 V 16 V 270 330 0.018 Ω 0.016 Ω >3500 mA 4700 mA 10× 10.5 11× 12 16SP270M 16SVP330M AVX Tantalum TPS (Surface Mt) 10 V 10 V 330 330 0.1 Ω 0.06 Ω >2500 mA >3000 mA 7.3L × 5.7W × 4.1H N/R (1) N/R (1) TPSE337M010R0100 (Vo<5.1V) TPSV337M010R0060 (Vo<5.1V) Kemet Tantalum T520/T495 Series (Surface Mt) 10 V 10 V 330 220 0.040 Ω 0.07 Ω 1600 mA >2000 mA 4.3W × 7.3L × 4.0H N/R (1) N/R (1) 520X337M010AS (Vo<5.1V) T495X227M0100AS (Vo<5.1V) Sprague Tantalum 594D Series (Surface Mt) 10 V 330 0.045 Ω 2360 mA 7.2L × 6W × 4.1H N/R (1) 1 594D337X0010R2T (Vo<5.1V)

ATH Series of Wide-Output Adjust Power Modules (12-V Input) North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Features of the ATH Family of Non-Isolated Wide Output Adjust Power Modules Point-of-Load Alliance The ATH family of non-isolated, wide-output adjust power modules from T exas Instruments are optimized for applications that require a flexible, high performance module that is small in size. These products are part of the “Point-of-Load Alliance” (POLA), which ensures compatible footprint, interoperability and true second sourcing for customer design flexibility. The POLA is a collaboration between T exas Instruments, Artesyn T ech- nologies, and Astec Power to offer customers advanced non-isolated modules that provide the same functionality and form factor. Pr oduct series covered by the alliance includes the ATH06 (6 A), ATH10 (10 A), ATH12/15 (12/15 A), ATH18/22 (18/22 A), and the ATH26/30 (26/ 30 A). From the basic, “Just Plug it In” functionality of the 6-A modules, to the 30-A rated feature-rich ATH30 Series, these products were designed to be very flexible, yet simple to use. The features vary with each product. T able 3-1 provides a quick reference to the available features by product and input bus voltage. Table 3-1; Operating Features by Series and Input Bus Voltage For simple point-of-use applications, the ATH06 (6A) provides operating features such as an on/off inhibit, output voltage trim, pre-bias startup (3.3/5-V input only), and over-current protection. The ATH10 (10 A), and ATH12/ 15 (12/15 A) include an output voltage sense, and margin up/down controls. Then the higher output current, ATH18/22 (18/22A) and ATH26/30 (26/30A) products incor- porate over-temperature shutdown protection. All of the products referenced in T able 3-1 include Auto-T rack™. Power-Up Characteristics When configured per their standard application all the ATH products will produce a regulated output voltage fol- lowing the application of a valid input source voltage. All the modules include soft-start circuitry. This slows the initial rate in which the output voltage can rise, thereby limiting the amount of in-rush current that can be drawn from the input source. The soft-start circuitry also introduces a short time delay (typically 5 ms-10 ms) into the power-up characteristic. This delay is from the point that a valid input source is recognized, to the initial rise of the output voltage. Figure 3-1 shows the power-up characteristic of the 10-A output product (ATH10K12), operating from a 12-V input bus and configured for a 3.3-V output. The waveforms were measured with a 5-A constant current load. The initial rise in input current when the input voltage first starts to rise is the charge current drawn by the input capacitors. Figure 3-1 Vin (5 V/Div) Vo (2 V/Div) Iin (2 A/Div) HORIZ SCALE: 5 ms/Div Over-Current Protection For protection against load faults, all modules incorporate output over-current protection. Applying a load that exceeds the regulator’s over-current threshold will cause the regulated output to shut down. Following shutdown, a module will periodically attempt to recover by initiating a soft-start power-up. This is described as a “hiccup” mode of operation, whereby the module continues in a cycle of successive shutdown and power up until the load fault is removed. During this period, the average current flowing into the fault is significantly reduced. Once the fault is removed, the module automatically recovers and returns to normal operation. Series Input Bus I OUT

12 V 6 A  

Adjust (Trim) Thermal Shutdown Pre-Bias Startup Margin Up/Down Auto-Track™ This is a feature unique to the ATH family, and was specifically designed to simplify the task of sequencing the supply voltage in a power system. These and other features are described in the following sections. 10 A ATH06 ATH10 ATH12/15 ATH18/22 ATH26/30

ATH Series of Wide-Output Adjust Power Modules (12-V Input) North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Figure 3-5; Simultaneous Power Up with Auto-Track Control PTH12010W Track VIN VO GNDInhibit PTH12020W Track VIN VO GNDInhibit

7 COUT

Vo2 =2V Vo1 =3.3V +12V On/Off Control 1 = Power Down 0 = Power Up BSS138 0.047µF 100k 2.0kΩ 8k06 Figure 3-4; Sequenced Power Up & Power Down Using Auto-Track Figure 3-6; Simultaneous Power Down with Auto-Track Control Vo1 (1 V/Div) Vo2 (1 V/Div) On/Off Control (5 V/Div) HORIZ SCALE: 10 ms/Div Vo1 (1V/Div) Vo2 (1 V/Div) On/Off Control (5 V/Div) HORIZ SCALE: 5 ms/Div ATH18K12 ATH12K12

ATH Series of Wide-Output Adjust Power Modules (12-V Input) North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Margin Up/Down Controls The ATH10 (10A), ATH12/15 (12/15A), ATH18/22 (18/ 22A), and ATH26/30 (26/30A) products incorporate Margin Up and Margin Down control inputs. These controls allow the output voltage to be momentarily adjusted 1, either up or down, by a nominal 5 %. This provides a convenient method for dynamically testing the operation of the load circuit over its supply margin or range. It can also be used to verify the function of supply voltage supervisors. The ±5 % change is applied to the adjusted output voltage, as set by the external resistor, Rset at the Vo Adjust pin. The 5 % adjustment is made by pulling the appropriate margin control input directly to the GND terminal 2. A low-leakage open-drain device, such as an n-channel MOSFET or p-channel JFET is recommended for this purpose 3. Adjustments of less than 5 % can also be accom- modated by adding series resistors to the control inputs (See Figure 3-4). The value of the resistor can be selected from T able 3-2, or calculated using the following formula. Up/Down Adjust Resistance Calculation T o reduce the margin adjustment to something less than 5 %, series resistors are required (See R D and R U in Figure 3-7). For the same amount of adjustment, the resistor value calculated for R U and R D will be the same. The formulas is as follows. RU or RD = 499 – 99.8 k Ω ∆% Where ∆ % = The desired amount of margin adjust in percent. Notes: 1. The Margin Up* and Margin Dn* controls were not intended to be activated simultaneously. If they are their affects on the output voltage may not completely cancel, resulting in the possibility of a slightly higher error in the output voltage set point. 2. The ground reference should be a direct connection to the module GND at pin 7 (pin 1 for the ATH06). This will produce a more accurate adjustment at the load circuit terminals. The transistors Q 1 and Q2 should be located close to the regulator. 3. The Margin Up and Margin Dn control inputs are not compatible with devices that source voltage. This includes TTL logic. These are analog inputs and should only be controlled with a true open-drain device (preferably a discrete MOSFET transistor). The device selected should have low off-state leakage current. Each input sources 8 µA when grounded, and has an open-circuit voltage of 0.8 V . Figure 3-7; Margin Up/Down Application Schematic Table 3-2; Margin Up/Down Resistor Values % Adjust R U / RD 5 0.0 k Ω 4 24.9 k Ω 3 66.5 k Ω 2 150.0 k Ω 1 397.0 k Ω Cout +Cin VIN GND MargDn L O A D +VOUT MargUp +Vo RD RU PTH05010W (Top View) 10 9 8 543 GND RSET