TL2575HV-15IKV_技术文档

TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

www.ti.com

SLVS638–MAY 2006

FEATURES

KTT (TO-263) PACKAGE

(TOP VIEW)

•

Fixed 3.3-V, 5-V, 12-V, and 15-V Options With

±5% Regulation (Max) Over Line, Load, and

Temperature Conditions

5

4

3

ON/OFF

FEEDBACK

GND

OUTPUT

V_IN

•

Adjustable Option With a Range of 1.23 V to

37 V (57 V for HV Version) and ±4%

Regulation (Max) Over Line, Load, and

Temperature Conditions

2

1

N (PDIP) PACKAGE

(TOP VIEW)

•

Specified 1-A Output Current

Wide Input Voltage Range…4.75 V to 40 V

(60 V for HV Version)

NC

V_IN

NC

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

•

Require Only Four External Components

(Fixed Versions) and Use Readily Available

Standard Inductors

OUTPUT

NC

GND

NC

GND

•

52-kHz (Typ) Fixed-Frequency Internal

Oscillator

NC

FEEDBACK

NC

TTL Shutdown Capability With 50-µA (Typ)

ON/OFF

Standby Current

NC − No internal connection

•

High Efficiency…as High as 88% (Typ)

KV (TO-220 STAGGERED LEADS) PACKAGE

Thermal Shutdown and Current-Limit

Protection With Cycle-by-Cycle Current

Limiting

(TOP VIEW)

(SIDE VIEW)

5

ON/OFF

FEEDBACK

GND

OUTPUT

V_IN

4

3

2

1

APPLICATIONS

•

Simple High-Efficiency Step-Down (Buck)

Regulators

•

Pre-Regulators for Linear Regulators

On-Card Switching Regulators

Positive-to-Negative Converters (Buck-Boost)

Pins 1, 3, 5

Pins 2, 4

DESCRIPTION/ORDERING INFORMATION

The TL2575 and TL2575HV greatly simplify the design of switching power supplies by conveniently providing all

the active functions needed for a step-down (buck) switching regulator in an integrated circuit. Accepting a wide

input voltage range of up to 60 V (HV version) and available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, or

an adjustable-output version, the TL2575 and TL2575HV have an integrated switch capable of delivering 1 A of

load current, with excellent line and load regulation. The device also offers internal frequency compensation, a

fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a manual shutdown

is available via an external ON/OFF pin.

The TL2575 and TL2575HV represent superior alternatives to popular three-terminal linear regulators. Due to

their high efficiency, the devices significantly reduce the size of the heatsink and, in many cases, no heatsink is

required. Optimized for use with standard series of inductors available from several different manufacturers, the

TL2575 and TL2575HV greatly simplify the design of switch-mode power supplies by requiring a minimal

addition of only four to six external components for operation.

The TL2575 and TL2575HV are characterized for operation over the virtual junction temperature range of –40°C

to 125°C.

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.

TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

www.ti.com

SLVS638–MAY 2006

ORDERING INFORMATION

TL2575 (V_IN(MAX)= 40 V)

V_O

(NOM)

T_J

PACKAGE⁽¹⁾

ORDERABLE PART NUMBER

TOP-SIDE MARKING

PDIP – N

Tube of 25

TL2575-33IN

PREVIEW

TL2575-05IN

PREVIEW

3.3 V

TO-263 – KTT

TO-220 – KV

PDIP – N

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

TL2575-33IKTTR

TL2575-33IKV

TL2575-05IN

5 V

12 V

15 V

ADJ

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575-05IKTTR

TL2575-05IKV

TL2575-12IN

–40°C to 125°C

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575-12IKTTR

TL2575-12IKV

TL2575-15IN

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575-15IKTTR

TL2575-15IKV

TL2575-ADJIN

TL2575-ADJIKTTR

TL2575-ADJIKV

TO-263 – KTT

TO-220 – KV

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

ORDERING INFORMATION

TL2575HV (V_IN(MAX)= 60 V)

V_O

(NOM)

T_J

PACKAGE⁽¹⁾

ORDERABLE PART NUMBER

TOP-SIDE MARKING

PDIP – N

Tube of 25

TL2575HV-33IN

PREVIEW

3.3 V

TO-263 – KTT

TO-220 – KV

PDIP – N

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

Tube of 25

Reel of 2000

Tube of 50

TL2575HV-33IKTTR

TL2575HV-33IKV

TL2575HV-05IN

5 V

12 V

15 V

ADJ

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575HV-05IKTTR

TL2575HV-05IKV

TL2575HV-12IN

–40°C to 125°C

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575HV-12IKTTR

TL2575HV-12IKV

TL2575HV-15IN

TO-263 – KTT

TO-220 – KV

PDIP – N

TL2575HV-15IKTTR

TL2575HV-15IKV

TL2575HV-ADJIN

TL2575HV-ADJIKTTR

TL2575HV-ADJIKV

TO-263 – KTT

TO-220 – KV

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

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TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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SLVS638–MAY 2006

FUNCTIONAL BLOCK DIAGRAM

V

IN

ON/OFF

5

Internal

Regulator

Unregulated

DC Input

On/Off

1

+

C

IN

FEEDBACK

4

Fixed-Gain

Error Amplifier

R2

1-A

Switch

Comparator

+

_

Driver

+

_

R1

1 kW

L1

V

OUT

OUTPUT

2

+

D1

C

OUT

L

O

A

D

GND

3

1.23-V

Band-Gap

Reference

52-kHz

Oscillator

Thermal

Shutdown

Current

Limit

Reset

3.3 V: R2 = 1.7 kW

5 V: R2 = 3.1 kW

12 V: R2 = 8.84 kW

15 V: R2 = 11.3 kW

ADJ: R1 = Open, R2 = 0 Ω

A. Pin numbers are for the KTT (TO-263) package.

FEEDBACK

4

7-V to 40-V

Unregulated

DC Input

5-V

Regulated

Output

+V

TL2575-05

IN

L1

L2

OUTPUT

2

1

330 µH

20 µH

1-A Load

3

GND

5

ON/OFF

+

C

C1

100 µF

IN

OUT

D1

1N5819

100 µF

330 µF

Optional Output Ripple Filter

A. Pin numbers are for the KTT (TO-263) package.

Figure 1. Typical Application Circuit (Fixed Version)

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TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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SLVS638–MAY 2006

Absolute Maximum Ratings⁽¹⁾

over operating free-air temperature range (unless otherwise noted)

MIN

–0.3

–65

MAX UNIT

TL2575HV

60

V

V_IN

Supply voltage

TL2575

42

ON/OFF input voltage range

Output voltage to GND (steady state)

Maximum junction temperature

Storage temperature range

V_IN

–1

V

T_J

150

°C

T_stg

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating

Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Package Thermal Data⁽¹⁾

PACKAGE

PDIP (N)

BOARD

θ_JC

θ_JCP

θ_JA

67°C/W

TBD

High K, JESD 51-7

High K, JESD 51-5

57°C/W

TO-263 (KTT)

TO-220 (KV)

TBD

(1) Maximum power dissipation is a function of T_J(max), θ_JA, and T_A. The maximum allowable power dissipation at any allowable ambient

temperature is P_D= (T_J(max) – T_A)/θ_JA. Operating at the absolute maximum T_Jof 150°C can affect reliability.

Recommended Operating Conditions

MIN

4.75

–40

MAX UNIT

TL2575HV

TL2575

60

V

V_IN

T_J

Supply voltage

40

Operating virtual junction temperature

125

°C

4

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TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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SLVS638–MAY 2006

TL2575 Electrical Characteristics

I_LOAD= 200 mA, V_IN= 12 V for 3.3-V, 5-V, and adjustable versions, V_IN= 25 V for 12-V version, V_IN= 30 V for 15-V version

(unless otherwise noted) (see Figure 2)

TL2575

PARAMETER

TEST CONDITIONS

T_J

UNIT

MIN

3.234

3.168

3.135

4.9

TYP

3.3

MAX

3.366

3.432

3.465

5.1

V_IN= 12 V, I_LOAD= 0.2 A

25°C

TL2575-33

TL2575-05

TL2575-12

TL2575-15

3.3

4.75 V ≤ V_IN≤ 40 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

V_IN= 12 V, I_LOAD= 0.2 A

5

25°C

4.8

5.2

8 V ≤ V_IN≤ 40 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

4.75

5.25

V_OUT

Output voltage

V

V_IN= 25 V, I_LOAD= 0.2 A

11.76

11.52

11.4

12

12.24

12.48

12.6

25°C

15 V ≤ V_IN≤ 40 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

V_IN= 30 V, I_LOAD= 0.2 A

14.7

15

15.3

25°C

14.4

15.6

18 V ≤ V_IN≤ 40 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

14.25

15.75

V_IN= 12 V, V_OUT= 5 V,

I_LOAD= 0.2 A

25°C

1.217

1.23

1.243

Feedback voltage TL2575-ADJ

V

25°C

1.193

1.18

1.267

1.28

8 V ≤ V_IN≤ 40 V, V_OUT= 5 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

TL2575-33

TL2575-05

V_IN= 12 V, I_LOAD= 1 A

V_IN= 15 V, I_LOAD= 1 A

V_IN= 18 V, I_LOAD= 1 A

75

77

88

TL2575-12

η

Efficiency

25°C

%

TL2575-15

V_IN= 12 V, V_OUT= 5 V,

I_LOAD= 1 A

TL2575-ADJ

77

50

25°C

Full range

25°C

100

500

58

I_IB

Feedback bias current

Oscillator frequency⁽¹⁾

V_OUT= 5 V (ADJ version only)

nA

47

42

52

f_o

kHz

Full range

25°C

63

0.9

1.2

1.4

V_SAT

Saturation voltage

I_OUT= 1 A⁽²⁾

V

%

A

Full range

25°C

Maximum duty cycle⁽³⁾

Switch peak current⁽¹⁾⁽²⁾

93

1.7

1.3

98

25°C

2.8

3.6

4

I_CL

Full range

V_IN= 40⁽⁴⁾, Output = 0 V

V_IN= 40⁽⁴⁾, Output = –1 V

2

I_L

Output leakage current

25°C

mA

7.5

5

30

10

200

I_Q

Quiescent current⁽⁴⁾

25°C

mA

I_STBY

Standby quiescent current

OFF (ON/OFF = 5 V)

50

µA

(1) In the event of an output short or an overload condition, self-protection features lower the oscillator frequency to 18 kHz and the

minimum duty cycle from 5% to 2%. The resulting output voltage drops to 40% of its nominal value, causing the average power

dissipated by the IC to lower.

(2) Output is not connected to diode, inductor, or capacitor. Output is sourcing current.

(3) FEEDBACK is disconnected from output and connected to 0 V.

(4) To force the output transistor off, FEEDBACK is disconnected from output and connected to 12 V for the adjustable, 3.3-V, and 5-V

versions and to 25 V for the 12-V and 15-V versions.

5

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1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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SLVS638–MAY 2006

TL2575 Electrical Characteristics (continued)

I_LOAD= 200 mA, V_IN= 12 V for 3.3-V, 5-V, and adjustable versions, V_IN= 25 V for 12-V version, V_IN= 30 V for 15-V version

(unless otherwise noted) (see Figure 2)

TL2575

PARAMETER

TEST CONDITIONS

T_J

UNIT

V

MIN

2.2

TYP

MAX

25°C

Full range

25°C

1.4

ON/OFF high-level logic

input voltage

V_IH

V_IL

OFF (V_OUT= 0 V)

2.4

1.2

1

0.8

30

ON/OFF low-level logic

input voltage

ON (V_OUT= nominal voltage)

V

Full range

25°C

I_IH

I_IL

ON/OFF high-level input current

ON/OFF low-level input current

OFF (ON/OFF = 5 V)

ON (ON/OFF = 0 V)

12

0

µA

25°C

10

6

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TL2575, TL2575HV

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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SLVS638–MAY 2006

TL2575HV Electrical Characteristics

I_LOAD= 200 mA, V_IN= 12 V for 3.3-V, 5-V, and adjustable versions, V_IN= 25 V for 12-V version, V_IN= 30 V for 15-V version

(unless otherwise noted) (see Figure 2)

TL2575HV

PARAMETER

TEST CONDITIONS

T_J

UNIT

MIN

3.234

3.168

3.135

4.9

TYP

3.3

MAX

3.366

3.450

3.482

5.1

V_IN= 12 V, I_LOAD= 0.2 A

25°C

TL2575HV-33

TL2575HV-05

TL2575HV-12

TL2575HV-15

3.3

4.75 V ≤ V_IN≤ 60 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

V_IN= 12 V, I_LOAD= 0.2 A

5

25°C

4.8

5.225

5.275

12.24

12.54

12.66

15.3

8 V ≤ V_IN≤ 60 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

4.75

V_OUT

Output voltage

V

V_IN= 25 V, I_LOAD= 0.2 A

11.76

11.52

11.4

12

25°C

15 V ≤ V_IN≤ 60 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

25°C

V_IN= 30 V, I_LOAD= 0.2 A

14.7

15

25°C

14.4

15.68

15.83

18 V ≤ V_IN≤ 60 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

14.25

V_IN= 12 V, V_OUT= 5 V,

I_LOAD= 0.2 A

25°C

1.217

1.23

1.243

Feedback voltage TL2575HV-ADJ

V

25°C

1.193

1.180

1.273

1.286

8 V ≤ V_IN≤ 60 V, V_OUT= 5 V,

0.2 A ≤ I_LOAD≤ 1 A

Full range

TL2575HV-33

TL2575HV-05

V_IN= 12 V, I_LOAD= 1 A

V_IN= 15 V, I_LOAD= 1 A

V_IN= 18 V, I_LOAD= 1 A

75

77

88

TL2575HV-12

η

Efficiency

25°C

%

TL2575HV-15

V_IN= 12 V, V_OUT= 5 V,

I_LOAD= 1 A

TL2575HV-ADJ

77

50

25°C

Full range

25°C

100

500

58

I_IB

Feedback bias current

Oscillator frequency⁽¹⁾

V_OUT= 5 V (ADJ version only)

nA

47

42

52

f_o

kHz

Full range

25°C

63

0.9

1.2

1.4

V_SAT

Saturation voltage

I_OUT= 1 A⁽²⁾

V

%

A

Full range

25°C

Maximum duty cycle⁽³⁾

Switch peak current⁽¹⁾⁽²⁾

93

1.7

1.3

98

25°C

2.8

3.6

4

I_CL

Full range

V_IN= 60⁽⁴⁾, Output = 0 V

V_IN= 60⁽⁴⁾, Output = –1 V

2

I_L

Output leakage current

25°C

mA

7.5

5

30

10

200

I_Q

Quiescent current⁽⁴⁾

25°C

mA

I_STBY

Standby quiescent current

OFF (ON/OFF = 5 V)

50

µA

(1) In the event of an output short or an overload condition, self-protection features lower the oscillator frequency to 18 kHz and the

minimum duty cycle from 5% to 2%. The resulting output voltage drops to 40% of its nominal value, causing the average power

dissipated by the IC to lower.

(2) Output is not connected to diode, inductor, or capacitor. Output is sourcing current.

(3) FEEDBACK is disconnected from output and connected to 0 V.

(4) To force the output transistor off, FEEDBACK is disconnected from output and connected to 12 V for the adjustable, 3.3-V, and 5-V

versions and to 25 V for the 12-V and 15-V versions.

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SLVS638–MAY 2006

TL2575HV Electrical Characteristics (continued)

I_LOAD= 200 mA, V_IN= 12 V for 3.3-V, 5-V, and adjustable versions, V_IN= 25 V for 12-V version, V_IN= 30 V for 15-V version

(unless otherwise noted) (see Figure 2)

TL2575HV

PARAMETER

TEST CONDITIONS

T_J

UNIT

V

MIN

2.2

TYP

MAX

25°C

Full range

25°C

1.4

ON/OFF high-level logic

input voltage

V_IH

V_IL

OFF (V_OUT= 0 V)

2.4

1.2

1

0.8

30

ON/OFF low-level logic input voltage ON (V_OUT= nominal voltage)

V

Full range

I_IH

I_IL

ON/OFF high-level input current

ON/OFF low-level input current

OFF (ON/OFF = 5 V)

ON (ON/OFF = 0 V)

12

0

µA

25°C

10

8

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SLVS638–MAY 2006

TEST CIRCUITS

Fixed-Output Voltage

FEEDBACK

4

+V

IN

TL2575-xx

L1

Fixed Output

V

OUT

OUTPUT

2

1

330 µH

V

IN

3

GND

5 ON/OFF

L

D1

+

Unregulated

DC Input

C

IN

O

A

D

+

C

100 µF

OUT

330 µF

C

= 100 µF, Aluminum Electrolytic

IN

= 330 µF, Aluminum Electrolytic

OUT

D1 = Schottky

L1 = 330 µH (for 5-V V with 3.3-V V

, use 100 mH)

OUT

IN

Adjustable-Output Voltage

FEEDBACK

4

+V

IN

TL2575

(ADJ)

L1

OUTPUT

2

V

OUT

1

330 µH

R2

R1

7-V to 40-V

Unregulated

DC Input

D1

11DQ06

3

GND

5

ON/OFF

L

+

C

IN

100 µF

O

A

D

+

C

OUT

330 µF

V

= V

(1 + R2/R1) = 5 V

OUT

REF

= 1.23 V

REF

R1 = 2 kW

R2 = 6.12 kW

A. Pin numbers are for the KTT (TO-263) package.

Figure 2. Test Circuits and Layout Guidelines

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SLVS638–MAY 2006

TYPICAL CHARACTERISTICS

1

0.8

0.6

0.4

0.2

0

1.4

1.2

1

V_IN= 20 V

I_LOAD= 200 mA

T_J= 25°C

I_LOAD= 200 mA

T_J= 25°C

0.8

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

-0.8

-1

-0.2

-0.4

-0.6

0

10

20

30

40

50

60

-50 -25

0

25

50

75

100 125 150

V_IN– Input Voltage – V

T_A– Temperature – °C

Figure 3. Normalized Output Voltage

Figure 4. Line Regulation

2

3

2.5

2

DV_OUT= 5%

R_IND= 0.2 W

1.75

1.5

1.25

1

I_LOAD= 1 A

1.5

1

0.75

0.5

0.25

0

I_LOAD= 200 mA

0.5

0

-40 -25 -10

5

20 35 50 65 80 95 110 125

-50

-25

0

25

50

75

100 125 150

T_J– Junction Temperature – °C

Figure 5. Dropout Voltage

Figure 6. Current Limit

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SLVS638–MAY 2006

TYPICAL CHARACTERISTICS (continued)

20

18

16

14

12

10

8

500

V_ON/OFF= 5 V

V_OUT= 5 V

450

T_J= 25°C

V_IN= 40 V

400

350

300

250

200

150

100

50

Measured at GND pin

I_LOAD= 1 A

6

I_LOAD= 0.2 A

4

V_IN= 12 V

2

0

10

20

30

40

50

60

-50 -25

0

25

50

75 100 125 150

V_IN– Input Voltage – V

T_J– Junction Temperature – °C

Figure 7. Quiescent Current

Figure 8. Standby Quiescent Current

10

8

1.2

1.1

1

Normalized at T_J= 25°C

6

V_IN= 12 V

4

T_J= –40°C

0.9

0.8

0.7

0.6

0.5

0.4

2

V_IN= 40 V

0

-2

T_J= 25°C

-4

-6

T_J= 125°C

-8

-10

-50

-25

0

25

50

75

100 125 150

0

0.2

0.4

0.6

0.8

1

T_J– Junction Temperature – °C

I_SW– Switch Current – A

Figure 9. Oscillator Frequency

Figure 10. Switch Saturation Voltage

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TYPICAL CHARACTERISTICS (continued)

5

4.5

4

100

90

Adjustable version only

80

70

60

3.5

3

50

40

30

2.5

2

20

10

0

1.5

1

-10

-20

-30

-40

-50

0.5

0

-50 -25

0

25

50

75

100 125 150

-50

-25

0

25

50

75

100 125 150

T_J– Junction Temperature – °C

Figure 11. Minimum Operating Voltage

Figure 12. FEEDBACK Current

V_OUT= 5 V

A

{

0 V

B

{

0 A

C

{

D

0 A

{

4 µs/Div

A. Output pin voltage, 10 V/Div

B. Output pin current, 1 A/Div

C. Inductor current, 0.5 A/Div

D. Ouput ripple voltage, 20 mV/Div

Figure 13. Switching Waveforms

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TYPICAL CHARACTERISTICS (continued)

0.2

0.15

0.1

0.05

0

-0.05

-0.1

-0.15

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

t – Time – ms

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

-0.1

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

t – Time – ms

Figure 14. Load Transient Response

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APPLICATION INFORMATION

Input Capacitor (C_IN)

For stability concerns, an input bypass capacitor (electrolytic, C_IN≥ 47 µF) needs to be located as close as

possible to the regulator. For operating temperatures below –25°C, C_INmay need to be larger in value. In

addition, since most electrolytic capacitors have decreasing capacitances and increasing ESR as temperature

drops, adding a ceramic or solid tantalum capacitor in parallel increases the stability in cold temperatures.

To extend the capacitor operating lifetime, the capacitor RMS ripple current rating should be:

I_C,RMS> 1.2(t_on/T)I_LOAD

where

t_on/T = V_OUT/V_IN{buck regulator} and

t_on/T = |V_OUT|/(|V_OUT| + V_IN) {buck-boost regulator}

Output Capacitor (C_OUT

)

For both loop stability and filtering of ripple voltage, an output capacitor also is required, again in close proximity

to the regulator. For best performance, low-ESR aluminum electrolytics are recommended, although standard

aluminum electrolytics may be adequate for some applications. Based on the following equation:

Output ripple voltage = (ESR of C_OUT) × (inductor ripple current)

Output ripple of 50 mV to 150 mV typically can be achieved with capacitor values of 220 µF to 680 µF. Larger

C_OUTcan reduce the ripple 20 mV to 50 mV peak to peak. To improve further on output ripple, paralleling of

standard electrolytic capacitors may be used. Alternatively, higher-grade capacitors such as high frequency, low

inductance, or low ESR can be used.

The following should be taken into account when selecting C_OUT

:

•

At cold temperatures, the ESR of the electrolytic capacitors can rise dramatically (typically 3× nominal value

at –25°C). Because solid tantalum capacitors have significantly better ESR specifications at cold

temperatures, they should be used at operating temperature lower than –25°C. As an alternative, tantalums

also can be paralleled to aluminum electrolytics and should contribute 10% to 20% to the total capacitance.

•

Low ESR for C_OUTis desirable for low output ripple. However, the ESR should be greater than 0.05 Ω to

avoid the possibility of regulator instability. Hence, a sole tantalum capacitor used for C_OUTis most

susceptible to this occurrence.

The capacitor’s ripple current rating of 52 kHz should be at least 50% higher than the peak-to-peak inductor

ripple current.

Catch Diode

As with other external components, the catch diode should be placed close to the output to minimize unwanted

noise. Schottky diodes have fast switching speeds and low forward voltage drops and, thus, offer the best

performance, especially for switching regulators with low output voltages (V_OUT< 5 V). If a high-efficiency,

fast-recovery, or ultra-fast-recovery diode is used in place of a Schottky, it should have a soft recovery (versus

abrupt turn-off characteristics) to avoid the chance of causing instability and EMI. Standard 50-/60-Hz diodes,

such as the 1N4001 or 1N5400 series, are not suitable.

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APPLICATION INFORMATION (continued)

Inductor

Proper inductor selection is key to the performance-switching power-supply designs. One important factor to

consider is whether the regulator is used in continuous mode (inductor current flows continuously and never

drops to zero) or in discontinuous mode (inductor current goes to zero during the normal switching cycle). Each

mode has distinctively different operating characteristics and, therefore, can affect the regulator performance

and requirements. In many applications, the continuous mode is the preferred mode of operation, since it offers

greater output power with lower peak currents, and also can result in lower output ripple voltage. The

advantages of continuous mode of operation come at the expense of a larger inductor required to keep inductor

current continuous, especially at low output currents and/or high input voltages.

The TL2575 and TL2575HV can operate in either continuous or discontinuous mode. With heavy load currents,

the inductor current flows continuously and the regulator operates in continuous mode. Under light load, the

inductor fully discharges and the regulator is forced into the discontinuous mode of operation. For light loads

(approximately 200 mA or less), this discontinuous mode of operation is perfectly acceptable and may be

desirable solely to keep the inductor value and size small. Any buck regulator eventually operates in

discontinuous mode when the load current is light enough.

The type of inductor chosen can have advantages and disadvantages. If high performance/quality is a concern,

then more-expensive toroid core inductors are the best choice, as the magnetic flux is contained completely

within the core, resulting in less EMI and noise in nearby sensitive circuits. Inexpensive bobbin core inductors,

however, generate more EMI as the open core does not confine the flux within the core. Multiple switching

regulators located in proximity to each other are particularly susceptible to mutual coupling of magnetic fluxes

from each other’s open cores. In these situations, closed magnetic structures (such as a toroid, pot core, or

E-core) are more appropriate.

Regardless of the type and value of inductor used, the inductor never should carry more than its rated current.

Doing so may cause the inductor to saturate, in which case the inductance quickly drops, and the inductor looks

like a low-value resistor (from the dc resistance of the windings). As a result, switching current rises dramatically

(until limited by the current-by-current limiting feature of the TL2575 and TL2575HV) and can result in

overheating of the inductor and the IC itself. Note that different types of inductors have different saturation

characteristics.

Output Voltage Ripple and Transients

As with any switching power supply, the output of the TL2575 and TL2575HV have a sawtooth ripple voltage at

the switching frequency. Typically about 1% of the output voltage, this ripple is due mainly to the inductor

sawtooth ripple current and the ESR of the output capacitor (see note on C_OUT). Furthermore, the output also

may contain small voltage spikes at the peaks of the sawtooth waveform. This is due to the fast switching of the

output switch and the parasitic inductance of C_OUT. These voltage spikes can be minimized through the use of

low-inductance capacitors.

There are several ways to reduce the output ripple voltage: a larger inductor, a larger C_OUT, or both. Another

method is to use a small LC filter (20 µH and 100 µF) at the output. This filter can reduce the output ripple

voltage by a factor of 10 (see Figure 2).

Feedback Connection

For fixed-voltage options, FEEDBACK must be wired to V_OUT. For the adjustable version, FEEDBACK must be

connected between the two programming resistors. Again, both of these resistors should be in close proximity to

the regulator, and each should be less than 100 kΩ to minimize noise pickup.

ON/OFF Input

ON/OFF should be grounded or be a low-level TTL voltage (typically <1.6 V) for normal operation. To shut down

the TL2575 or TL2575HV and put it in standby mode, a high-level TTL or CMOS voltage should be supplied to

this pin. ON/OFF should not be left open and safely can be pulled up to V_INwith or without a pullup resistor.

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APPLICATION INFORMATION (continued)

Grounding

The power and ground connections of the TL2575 and TL2575HV must be low impedance to help maintain

output stability. For the 5-pin packages, both pin 3 and tab are ground, and either connection can be used as

they are both part of the same lead frame. With the 16-pin package, all the ground pins (including signal and

power grounds) should be soldered directly to wide PCB copper traces to ensure low-inductance connections

and good thermal dissipation.

Layout Guidelines

With any switching regulator, circuit layout plays an important role in circuit performance. Wiring and parasitic

inductances, as well as stray capacitances, are subjected to rapidly switching currents, which can result in

unwanted voltage transients. To minimize inductance and ground loops, the length of the leads indicated by

heavy lines should be minimized. Optimal results can be achieved by single-point grounding (see Figure 2) or by

ground-plane construction. For the same reasons, the two programming resistors used in the adjustable version

should be located as close as possible to the regulator to keep the sensitive feedback wiring short.

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BUCK REGULATOR DESIGN PROCEDURE

PROCEDURE (Fixed Output)

EXAMPLE (Fixed Output)

Known:

V_OUT= 3.3 V, 5 V, 12 V, or 15 V

V_IN(Max)= Maximum input voltage

I_LOAD(Max)= Maximum load current

V_OUT= 5 V

V_IN(Max)= 20 V

I_LOAD(Max)= 1 A

1. Inductor Selection (L1)

A. From Figure 15 through Figure 18, select the appropriate inductor A. From Figure 16 (TL2575-05), the intersection of 20-V line and

code based on the intersection of V_IN(Max)and I_LOAD(Max)

.

1-A line gives an inductor code of L330.

B. From Table 2, choose the appropriate inductor based on the

inductor code. Parts from three well-known inductor manufacturers

are given. The inductor chosen should be rated for operation at

52-kHz and have a current rating of at least 1.15 × I_LOAD(Max)to

allow for the ripple current. The actual peak current in L1 (in normal

operation) can be calculated as follows:

B. L330 → L1 = 330 µH

Choose from:

34042 (Schott)

PE-52627 (Pulse Engineering)

RL1952 (Renco)

I_L1(pk)= I_LOAD(Max)+ (V_IN– V_OUT) × t_on/2L1

Where t_on= V_OUT/V_IN× (1/f_osc

)

2. Output Capacitor Selection (C_OUT

)

2. Output Capacitor Selection (C_OUT

)

A. The TL2575 control loop has a two-pole two-zero frequency

response. The dominant pole-zero pair is established by C_OUTand

L1. To meet stability requirements while maintaining an acceptable

output ripple voltage (V_ripple≈ 0.01 × V_OUT), the recommended range

for a standard aluminum electrolytic C_OUTis between 100 µF and

470 µF.

A. C_OUT= 100-µF to 470-µF, standard aluminum electrolytic

B. C_OUTshould have a voltage rating of at least 1.5 × V_OUT. But if a B. Although a C_OUTrated at 8 V is sufficient for V_OUT= 5 V, a

low output ripple voltage is desired, choose capacitors with a

higher-voltage ratings than the minimum required, due to their

typically lower ESRs.

higher-voltage capacitor is chosen for its typically lower ESR (and

hence lower output ripple voltage) → Capacitor voltage

rating = 20 V.

3. Catch Diode Selection (D1) (see Table 1)

A. In normal operation, the catch diode requires a current rating of

at least 1.2 × I_LOAD(Max). For the most robust design, D1 should be

rated to handle a current equal to the TL2575 maximum switch peak

current; this represents the worst-case scenario of a continuous

A. Pick a diode with 3-A rating.

short at V_OUT

.

B. The diode requires a reverse voltage rating of at least

B. Pick 30-V rated Schottky diode (1N5821, MBR330, 31QD03, or

SR303) or 100-V rated Fast Recovery diode (31DF1, MURD310, or

HER302).

1.25 × V_IN(Max)

.

4. Input Capacitor (C_IN

)

4. Input Capacitor (C_IN

)

An aluminum electrolytic or tantalum capacitor is needed for input

bypassing. Locate C_INas close to the V_INand GND pins as

possible.

C_IN= 100 µF, 25 V, aluminum electrolytic

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PROCEDURE (Adjustable Output)

EXAMPLE (Adjustable Output)

Known:

V_OUT(Nom)

V_OUT= 10 V

V_IN(Max)= 25 V

I_LOAD(Max)= 1 A

V_IN(Max)= Maximum input voltage

I_LOAD(Max)= Maximum load current

1. Programming Output Voltage (Selecting R1 and R2)

Select R1 = 1 kΩ

Referring to Fig. 2, V_OUTis defined by:

R2

R1

R2 = 1 (10/1.23 – 1) = 7.13 kΩ

V_OUT= V_REF

where V_REF= 1.23 V

1 +

(

Select R2 = 7.15 kΩ (closest 1% value)

Choose a value for R1 between 1 kΩ and 5 kΩ (use 1% metal-film

resistors for best temperature coefficient and stability over time).

V_OUT

R2 = R1

– 1

(

V_REF

2. Inductor Selection (L1)

A. Calculate the "set" volts-second (E•T) across L1:

E•T = (V_IN– V_OUT) × t_on

A. Calculate the "set" volts-second (E•T) across L1:

E•T = (25 – 10) × (10/25) × (1000/52) [V•µs]

E•T = 115 V•µs

E•T = (V_IN– V_OUT) × (V_OUT/V_IN) × {1000/f_osc(in kHz)} [V•µs]

NOTE: Along with I_LOAD, the "set" volts-second (E•T) constant

establishes the minimum energy storage requirement for the

inductor.

B. Using Figure 19, select the appropriate inductor code based on

B. Using Figure 19, the intersection of 115 V•µs and 1 A

the intersection of E•T value and I_LOAD(Max)

.

corresponds to an inductor code of H470.

C. From Table 2, choose the appropriate inductor based on the

inductor code. Parts from three well-known inductor manufacturers

are given. The inductor chosen should be rated for operation at

52-kHz and have a current rating of at least 1.15 x I_LOAD(Max)to

allow for the ripple current. The actual peak current in L1 (in normal

operation) can be calculated as follows:

C. H470 → L1 = 470 µF

Choose from:

34048 (Schott)

PE-53118 (Pulse Engineering)

RL1961 (Renco)

I_L1(pk)= I_LOAD(Max)+ (V_IN– V_OUT) × t_on/2L1

Where t_on= V_OUT/V_IN× (1/f_osc

)

3. Output Capacitor Selection (C_OUT

)

3. Output Capacitor Selection (C_OUT)

A. The TL2575 control loop has a two-pole two-zero frequency

response. The dominant pole-zero pair is established by C_OUTand

L1. To meet stability requirements, C_OUTmust meet the following

A.C_OUT≥ 7785 × 25/(10 × 470) [µF]

C_OUT≥ 41.4 µF

To obtain an acceptable output voltage ripple →

C_OUT= 220 µF electrolytic

requirement:

V_IN(Max)

_OUT· L1(µH)

C_OUT³ 7758

(µF)

V

However, C_OUTmay need to be several times larger than the

calculated value above in order to achieve an acceptable output

ripple voltage of ~0.01 × V_OUT

.

B. C_OUTshould have a voltage rating of at least 1.5 × V_OUT. But if a

low output ripple voltage is desired, choose capacitors with a higher

voltage ratings than the minimum required due to their typically

lower ESRs.

4. Catch Diode Selection (D1) (see Table 1)

A. In normal operation, the catch diode requires a current rating of

at least 1.2 × I_LOAD(Max). For the most robust design, D1 should be

rated for a current equal to the TL2575 maximum switch peak

current; this represents the worst-case scenario of a continuous

A. Pick a diode with a 3-A rating.

short at V_OUT

.

B. The diode requires a reverse voltage rating of at least

B. Pick a 40-V rated Schottky diode (1N5822, MBR340, 31QD04, or

SR304) or 100-V rated Fast Recovery diode (31DF1, MURD310, or

HER302)

1.25 × V_IN(Max)

.

5. Input Capacitor (C_IN

)

5. Input Capacitor (C_IN

)

An aluminum electrolytic or tantalum capacitor is needed for input

bypassing. Locate C_INas close to V_INand GND pins as possible.

C_IN= 100 µF, 35 V, aluminum electrolytic

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Inductor Value Selection Guide for Continuous-Mode Operation

Figure 15. TL2575-33

Figure 16. TL2575-50

Figure 17. TL2575-12

Figure 18. TL2575-15

Figure 19. TL2575-ADJ

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Table 1. Diode Selection Guide

SCHOTTKY

FAST RECOVERY

V_R

1A

3A

1A

3A

1N5817

MBR120P

SR102

1N5820

MBR320

SR302

20 V

1N5818

MBR130P

11DQ03

SR103

1N5821

MBR330

31DQ03

SR303

30 V

40 V

The following diodes

are all rated to 100 V: are all rated to 100 V:

The following diodes

1N5819

MBR140P

11DQ04

SR104

IN5822

MBR340

31DQ04

SR304

11DF1

MUR110

HER102

31DF1

MURD310

HER302

MBR150

11DQ05

SR105

MBR350

31DQ05

SR305

50 V

60 V

MBR160

11DQ06

SR106

MBR360

31DQ06

SR306

Table 2. Inductor Selection by Manufacturer's Part Number

INDUCTOR VALUE

SCHOTT

RENCO

INDUCTOR CODE

PULSE ENGINEERING⁽²⁾

(µH)

CORPORATION⁽¹⁾

ELECTRONICS⁽³⁾

RL2444

RL1954

RL1953

RL1952

RL1951

RL1950

RL2445

RL2446

RL2447

RL1961

RL1960

RL1959

RL1958

RL2448

L100

L150

100

150

220

330

470

680

150

220

330

470

680

1000

1500

2200

67127000

67127010

67127020

67127030

67127040

67127050

67127060

67127070

67127080

67127090

67127100

67127110

67127120

67127130

PE-92108

PE-53113

PE-52626

PE-52627

PE-53114

PE-52629

PE-53115

PE-53116

PE-53117

PE-53118

PE-53119

PE-53120

PE-53121

PE-53122

L220

L330

L470

L680

H150

H220

H330

H470

H680

H1000

H1500

H2200

(1) Schott Corporation, (612) 475-1173, 1000 Parkers Lake Rd., Wayzata, MN 55391

(2) Pulse Engineering, (619) 674-8100, P.O. Box 12236, San Diego, CA 92112

(3) Renco Electronics Inc., (516) 586-5566, 60 Jeffryn Blvd. East, Deer Park, NY 11729

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PACKAGE OPTION ADDENDUM

www.ti.com

18-May-2006

PACKAGING INFORMATION

Orderable Device

TL2575-05IN

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

PDIP

N

16

25

Pb-Free

(RoHS)

CU NIPD

N / A for Pkg Type

TL2575-33IN

PDIP

N

16

25

Pb-Free

(RoHS)

CU NIPD

N / A for Pkg Type

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

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.

Addendum-Page 1

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TL2575HV-15IKV [TI]

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