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FEATURES APPLICATIONS

DESCRIPTION

(1)

100 µF

Electrolytic

(Required)

3 × 4.7 µF

Ceramic

(Required)

(3)

4.7 µF

Ceramic

(Optional)

UDG−05094

SET

(2)

1%, 0.05 W

(Required)

(1)

100 µF

(Required)

GND

N/C N/C

PTN78060A

SLTS245B – APRIL 2005 – REVISED AUGUST 2006

15-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE

VOLTAGE REGULATOR MODULE

• General-Purpose, Industrial Controls,

• Up to 3-A Output Current

HVAC Systems

• Wide-Input Voltage

• Test and Measurement,

(9 V to 29 V)

Medical Instrumentation

• Wide-Output Voltage Adjust

• AC/DC Adaptors, Vehicles,

(–15 V to –3 V)

Marine, and Avionics

• High Efficiency (Up to 88%)

• Undervoltage Lockout

• Output Current Limit

• Overtemperature Shutdown

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

• Surface-Mount Package Available

The PTN78060A is a series of high-efficiency, buck-boost, integrated switching regulators (ISR), that represent

the third generation in the evolution of the (PT)78NR100 series of products. In new designs, the PTN78060A

series should also be considered in place of the PT6640 series of single in-line pin (SIP) products. In all cases,

the PTN78060A 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.

Operating from a wide-input voltage range of 9 V to 29 V, the PTN78060A provides high-efficiency,

positive-to-negative voltage conversion for loads of up to 3 A. The output voltage can be set to any value over a

wide adjustment range using a single external resistor. The adjust range is –15 V to –3 V.

The PTN78060A is suited to a wide variety of general-purpose industrial applications that operate off 12-V, 24-V,

or tightly regulated 28-V dc power.

(1) See the Application Information section for capacitor recommendations

(2) R

SET

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

(3) For reduced V

ripple and noise, a ceramic capacitor is suggested.

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 (19 pages)

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PTN78060A www.ti.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 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. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 ELECTRICAL CHARACTERISTICS operating at 25°C free-air temperature, VI = 20 V, VO = –5 V, IO = IO (max), C1 = 100 µF, C2 = 3 × 4.7 µF, C3 = 100 µF, and C4 = 4.7 µF (unless otherwise noted) PARAMETER IO Output current VI Input voltage range VO TEST CONDITIONS TA = 85°C, natural convection airflow Over IO range η (1) VO = –12 V 0.1 1.25 (1) VO = –5 V 0.1 3 (1) VO = –3.3 V 0.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 PIN ASSIGNMENT 1 7 PTN78060A (Top View) 2 6 3 4 5 TERMINAL FUNCTIONS TERMINAL 4 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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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 TYPICAL CHARACTERISTICS (9-V INPUT) (1) (2) OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 75 VO = -12 V 70 VO = -15 V 65 VO = -5 V 60 VO = -3 V 55 50 0 0.5 1 1.5 2 2.5 3 300 4.5 250 VO = -15 V 200 150 100 VO = -5 V 50 VO = -3 V 0 0 1.5 1 VO = -5 V 0.5 3 VO = -3 V 0 0.5 1.5 1 2.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 TYPICAL CHARACTERISTICS (12-V INPUT) (1) (2) OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 75 VO = -12 V 70 VO = -5 V VO = -15 V 65 VO = -3 V 60 55 50 0 0.5 1 1.5 2 2.5 3 VO = -15 V 120 80 VO = -5 V 40 VO = -3 V 1.5 2.5 2 2 1.5 1 VO = -5 V 0.5 3 VO = -3 V 0 0.5 1.5 1 2.5 2 3 IO - Output Current - A Figure 9.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 TYPICAL CHARACTERISTICS (24-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 160 80 75 70 65 VO = -5 V 60 55 VO = -3 V 50 45 40 0 0.5 1 1.5 2 2.5 3 3.5 140 120 PD - Power Dissipation - W VO - Output Voltage Ripple - mVPP 90 85 Efficiency - % POWER DISSIPATION vs OUTPUT CURRENT VO = -5 V 100 80 60 40 VO = -3 V 20 0 IO - Output Current - A 0 0.5 1 1.5 2.5 2 3 2.5 VO = -5 V 2 1.
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PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 APPLICATION INFORMATION Adjusting the Output Voltage of the PTN78060A 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.
PAGE 9
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 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.
PAGE 10
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 CAPACITOR RECOMMENDATIONS FOR THE PTN78060 WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum requirement for the input bus is 100 µF of nonceramic capacitance and 14.1 µF (3× 4.7 µF) of ceramic capacitance, in either an X5R or X7R temperature characteristic. Ceramic capacitors should be located within 0.5 inch (1,27 cm) of the regulator's input pins.
PAGE 11
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 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.
PAGE 12
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 Power-Up Characteristics When configured per the standard application, the PTN78060A 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.
PAGE 13
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 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.
PAGE 14
PTN78060A www.ti.com SLTS245B – APRIL 2005 – REVISED AUGUST 2006 C7 4.7 µF Ceramic VI L1 1 µH − 5 µH 2 1,7 VI GND GND Adjust 6 C2 100 µF Electrolytic (Required) VO Vo PTN78060A + C1 4.7 µF Ceramic L2 1 µH − 5 µH 4 C3 3 × 4.7 µF 50 V Ceramic (Required) + RSET (2) + C4 (2) 100 µF (Required) C5 4.7 µF Ceramic C6 (3) GND UDG−05093 (1) See the specifications for required value and type. (2) See the Application Information section for suggested value and type.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.