Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPTN78020AAH

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FEATURES APPLICATIONS

DESCRIPTION

C2*

4x 4.7 F

Ceramic

(Required)

C1*

100 F

Electrolytic

(Required)

C3*

100 F

(Required)

GND GND

PTN78020A

(Top View)

*See the for capacitor recommendation.Application Information

SET

is required to adjust the output voltage lower than -3 V. See the for values.Application Information

STANDARD APPLICATION

4 5

SET

1 %, 0.05 W

(Required)

PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

25-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE

REGULATOR MODULE

• General-Purpose, Industrial Controls,

• 4-A Output Current

HVAC Systems, Test and Measurement,

• Wide-Input Voltage

Medical Instrumentation, AC/DC Adaptors,

(9 V to 29 V)

Vehicles, Marine, and Avionics

• Wide-Output Voltage Adjust

(–15 V to –3 V)

• High Efficiency (Up to 87%)

• Output Current Limit

• Overtemperature Shutdown

• Undervoltage Lockout

• Operating Temperature: –40°C to 85°C

• Surface-Mount Package Available

The PTN78020A is a series of high-efficiency buck-boost-integrated switching regulators (ISR), that represent the

third generation in the evolution of high-performance power modules designed for industrial use. The wide-input

voltage range makes these modules suitable for a variety of applications that operate off 12–V, 24–V, and

tightly-regulated 28–V dc power. In new designs, they should be considered in place of the PT6640 and

PT78NR100 series of single in-line pin (SIP) products. The PTN78020A is smaller and lighter than its

predecessors, and has either similar or improved electrical performance characteristics. The caseless,

double-sided package has excellent thermal characteristics, and is compatible with TI's roadmap for RoHS and

lead-free compliance.

The PTN78020A operates over an input voltage range of 9 V to 29 V, and provides high-efficiency,

positive-to-negative voltage conversion for loads of up to 4 A. The output voltage is set using a single external

resistor, and may be adjusted to any value within the range, –15 V to –3 V.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (20 pages)

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PTN78020A www.ti.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 ELECTRICAL CHARACTERISTICS operating at 25°C free-air temperature, VI = 20 V, VO = –5 V, IO = IO (max), CI = 100 µF and 4x 4.7 µF, C O = 100 µF (unless otherwise noted) PARAMETER IO Output current VI Input voltage range VO VO (adj) η TEST CONDITIONS TA = 25°C, natural convection airflow Over IO range MIN VO = -3 V 0.1 4 (1) 0.1 2.1 (1) VO = -15 V 0.1 1.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 PIN ASSIGNMENT 1 7 PTN78020A (Top View) 2 6 3 4 5 TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION 1, 7 O The negative output voltage power connection. It is also the reference for the VO Adjust control input. For proper operation, pins 1 and 7 must be connected. VI 2 I The positive input voltage power node to the module, which is referenced to common GND. N/C 3 VO Adjust 4 N/C 5 GND 6 NAME NO.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 TYPICAL CHARACTERISTICS (9-V INPUT) (1) (2) VO = -15 V VO = -12 V 80 75 70 65 60 VO = -3 V VO = -5 V 55 50 45 40 0 1 2 3 300 VO = -15 V 250 200 150 100 VO = -5 V 50 VO = -3 V 0 4 0 IO - Output Current - A 2 1.5 VO = -5 V 1 0.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 TYPICAL CHARACTERISTICS (12-V INPUT) (1) (2) VO = -15 V VO = -12 V 80 75 70 65 60 VO = -5 V VO = -3 V 55 50 45 40 0 1 2 3 4 300 VO = -12 V 250 200 150 100 50 VO = -3 V 0 0 1 IO - Output Current - A VO = -3 V 0 1 2 3 4 IO - Output Current - A TEMPERATURE DERATING vs OUTPUT CURRENT TEMPERATURE DERATING vs OUTPUT CURRENT Ambient Temperature - oC Ambient Temperature - oC 1 0.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 TYPICAL CHARACTERISTICS (24-V INPUT) (1) (2) OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT VO - Output Voltage Ripple - mVPP EFFICIENCY vs OUTPUT CURRENT 90 VO = -5 V Efficiency - % 80 70 60 VO = -3 V 50 40 0 1 2 3 140 120 100 VO = -5 V 80 60 40 VO = -3 V 20 0 4 0 1 2 3 Figure 13. Figure 14. POWER DISSIPATION vs OUTPUT CURRENT TEMPERATURE DERATING vs OUTPUT CURRENT 5 4.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 APPLICATION INFORMATION Adjusting the Output Voltage of the PTN78020A Wide-Output Adjust Power Modules General A resistor must be connected directly between the VO Adjust control (pin 4) and the output voltage (pin 7) to set the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output voltage defaults to the highest value, –3 V.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 Table 2. Output Voltage Set-Point Resistor Values VO Required RSET VO Required RSET VO Required RSET –15.0 V 99 Ω –11.9 V 2.09 kΩ –8.8 V 6.21 kΩ –14.9 V 147 Ω –11.8 V 2.18 kΩ –8.6 V 6.63 kΩ –14.8 V 196 Ω –11.7 V 2.27 kΩ –8.4 V 7.09 kΩ –14.7 V 245 Ω –11.6 V 2.36 kΩ –8.2 V 7.58 kΩ –14.6 V 296 Ω –11.5 V 2.45 kΩ –8.0 V 8.11 kΩ –14.5 V 347 Ω –11.4 V 2.55 kΩ –7.8 V 8.68 kΩ –14.4 V 400 Ω –11.3 V 2.65 kΩ –7.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 CAPACITOR RECOMMENDATIONS FOR THE PTN78020 WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum requirement for the input capacitance is 18.8-µF (4× 4.7-µF) ceramic capacitance, in either a X5R or X7R temperature characteristic, and 100-µF of nonceramic capacitance. Ceramic capacitors should be located within 0.5 inch (1,27 cm) of the regulator's input pins.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 Designing for Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1 A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the required value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation circuit ultimately depends on its output capacitor decoupling network.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 Table 3. Recommended Input/Output Capacitors (continued) CAPACITOR CHARACTERISTICS QUANTITY WORKING VOLTAGE (V) VALUE (µF) EQUIVALENT SERIES RESISTANCE (ESR) (Ω) 85°C MAXIMUM RIPPLE CURRENT (mArms) Kemet X7R Ceramic 50 1.0 0.002 >1000 3225 1 C1210C105K5RAC Murata X7R Ceramic 50 4.7 0.002 >1000 3225 ≥4 1 GRM32ER71H475KA88L TDK X7R Ceramic 50 2.2 0.002 >1000 3225 ≥8 1 C3225X7R1H225KT Murata X7R Ceramic 50 1.0 0.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 Power-Up Characteristics When configured per the standard application, the PTN78020A power module produces a regulated output voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input source.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 Optional Input/Output Filters Power modules include internal input and output ceramic capacitors in all of their designs. However, some applications require much lower levels of either input reflected or output ripple/noise. This application describes various filters and design techniques found to be successful in reducing both input and output ripple/noise.
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PTN78020A www.ti.com SLTS244A – APRIL 2005 – REVISED MAY 2005 VI L1 1 - 5 mH 2 PTN78020A VI GND C2 100 mF Electrolytic (Required) 1, 7 VO Adjust 6 C1 1 mF Ceramic VO L2 1 - 5 mH 4 # C3* 18.8 mF Ceramic (Required) C4 100 mF (Required) RSET GND C5 1 mF Ceramic C6 † GND * See the specifications for required value and type. # See the Application Information for suggested value and type. † Recommended for applications with load transients. Figure 20.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.