SP6136EB_技术文档

SP6136 (7A MAX.)

Evaluation Board Manual

ꢀ Easy Evaluation for the

SP6136ER1 12V Input, 0 to 7A

Output Synchronous Buck

Converter

ꢀ Precision 0.80V 1% High

Accuracy Reference

ꢀ Small form factor

ꢀ Feature Rich: Single supply operation, Over-

current protection with auto-restart, Power

Good Output, Enable input, Fast transient

response, Short Circuit Shutdown Protection,

Programmable soft start

ꢀ TSSOP Package & SMT components for

small, low profile Power Supply

SP6136EB SCHEMATIC

1

VIN

VCC

1

6

Ci

1

C1

0.1uF

22uF

16V

12V

DBST

SD101AWS

1210

8 7 6 5

1

GND

8

MT

CVCC

4.7uF

Si4354DY

CBST

0.1uF

CIN & COUT CERAMIC 1210 X5R

4

18.5mOhm

10V

1

2

GL

GH

12

11

10

9

1 2 3

GH

Note:

PGND

GND

SWN

U1

SWN

3

All resistors & capacitors size

0603 unless other wise specified

SP6136

AGND

ISP

ISN

1

17

4

DIEPAD

CSP

CS

RS3

10K1%

2

8 7 6 5

VFB

0.1uF

6.8nF

MB

R5

R3

NP

Inter-Technical SC7232-2R2

2.2uH, 10.4 mOhm

Si4886DY

SS

GL

4

13.5mOhm

10.0k,1%

CSS

47nF

1

VOUT

1 2 3

EN

UVIN

7

1

2

3

RS1

Co

100uF

6.3V

J1

3.30V

0-7A

SS

ISP

5

3

PTC36SAAN

5.11k,1%

RS2

1210

ISN

PWRGD

1

GND2

C2

0.01uF

R4

NP

CP1

5.11k,1%

4

9

12pF

RZ2

R1

CZ2

CZ3

RZ3

68.1k,1%

CF1

22pF

560pF

30.9K,1%

270pF

1K 1%

R2

21.5k,1%

VFB

Rev 5/01/06

SP6136 Evaluation Manual

USING THE EVALUATION BOARD

1) Powering Up the SP6136EB Circuit

Connect the SP6136ER1 Evaluation Board

with an external +12V power supply.

Connect with short leads and large

diameter wire directly to the “VIN” and

“GND” posts. Connect a Load between the

“VOUT” and “GND2” posts, again using

short leads with large diameter wire to

minimize inductance and voltage drops.

the R1 and R2 combination to meet the

exact output voltage setting by restricting

R1 resistance range such that 50KΩ ≤ R1 ≤

100KΩ for overall system loop stability.

Note that since the SP6136ER1 Evaluation

Board design was optimized for 12V down

conversion to 3.30V, changes of output

voltage and/or input voltage may alter

performance from the data given in the

Power Supply Data section.

2)

Characteristics

Measuring

Output

Load

It’s best to GND reference scope and digital

meters using the Star GND post in the

center of the board. VOUT ripple can best

be seen touching probe tip to the pad for

COUT and scope ground collar touching

Star GND post – avoid a ground lead on the

probe which will increase noise pickup.

POWER SUPPLY DATA

The SP6136ER1 is designed with an

accurate 1.5% reference over line, load and

temperature. Figure 1 data shows a typical

SP6136ER1 Evaluation Board efficiency

plot, with efficiencies to 92% and output

currents to 7A. Load Regulation in Figure 2

shows only 0.12% change in output voltage

from no load to 7A. Figures 3 and 4 show

the fast transient response. Start-up

corresponding to different load conditions is

shown in Figures 5, 6 and 7, where the

input current rises smoothly as the soft-start

ramp increases. In Figure 8 the hiccup

mode gets activated in response to an

output dead short circuit condition and will

soft-start until the over-load is removed.

Figure 9 and 10 show output voltage ripple

less than 11mV over complete load range.

3) Using the Evaluation Board with

Different Output Voltages

While the SP6136ER1 Evaluation Board

has been tested and delivered with the

output set to 3.30V, by simply changing one

resistor, R2, the SP6136ER1 can be set to

other output voltages. The relationship in

the following formula is based on a voltage

divider from the output to the feedback pin

VFB, which is set to an internal reference

voltage of 0.80V.

Standard 1% metal film resistors of surface

mount size 0603 are recommended.

While data on individual power supply

boards may vary, the capability of the

SP6136ER1 of achieving high accuracy

over a range of load conditions shown here

is quite impressive and desirable for

accurate power supply design.

Vout = 0.80V ( R1 / R2 + 1 ) =>

R2 = R1 / [ ( Vout / 0.80V ) – 1 ]

Where R1 = 68.1KΩ and for Vout = 0.80V

setting, simply remove R2 from the board.

Furthermore, one could select the value of

Rev 5/01/06

SP6136 Evaluation Manual

Page 2 of 9

Output Voltage vs Load Current

Efficiency vs Load Current

100

90

80

70

60

50

40

3.320

3.315

3.310

3.305

3.300

Vin=12V

Vout=3.3V

Vin=12V

Vout=3.3V

0.0

1.0

2.0

3.0

4.0

Load current (A)

5.0

6.0

7.0

0.0

1.0

2.0

3.0

4.0

Load current (A)

5.0

6.0

7.0

Figure 1. Efficiency vs Load

Figure 2. Load Regulation

Vout (100mV/div)

Vout (200mV/div)

Vin=12V

Vout=3.3V

Vin=12V

Vout=3.3V

Iout(5A/div)

Iout (5A/div)

Figure 3. Load Step Response: 3.5A->7A

Figure 4. Load Step Response: 0->7A

Vin

Vout

Vin=12V

Vout=3.3V

SoftStart

Vin=12V

Vout=3.3V

SoftStart

Iout (5A/div)

Iout(5A/div)

Figure 5. Start-Up Response: No Load

Figure 6. Start-Up Response: 3A Load

Vout

Vin

SoftStart

Vin=12V

Vout=3.3V

Vout

Vin=12V

Vout=3.3V

SoftStart

Iout(5A/div)

Ichoke(25A/div)

Figure 7. Start-Up Response: 7A Load

Rev 5/01/06

Figure 8. Output Load Short Circuit

SP6136 Evaluation Manual

Page 3 of 9

Vout Ripple(10mV/div)

Vin=12V

Vout=3.3V

Vin=12V

Vout=3.3V

SW Node

Figure 9. Output Noise at No Load

Figure 10. Output Noise at 7A Load

INDUCTORS - SURFACE MOUNT

Inductor Specification

Size

Inductance

Manufacturer/Part No.

Series R

mOhms

Isat

(A)

Inductor Type

Manufacturer

Website

(uH)

LxW(mm) Ht.(mm)

Shielded Ferrite Core

Inter-Technical

SC7232-2R2M

www.inter-technical.com

2.2

10.4

13.00

7.2x6.6

3.20

CAPACITORS - SURFACE MOUNT

Capacitor Specification

Capacitance(

uF)

Manufacturer/Part No.

ESR

Ripple Current

(A) @ 45C

Size

Voltage

(V)

Capacitor

Type

Manufacturer

Website

ohms (max)

LxW(mm) Ht.(mm)

TDK

16.0

6.3

X5R Ceramic

www.TDK.com

22

0.005

4.00

3X2

2.00

C3225X5R1C226M

TDK

100

C3225X5R0J107M

MOSFETS - SURFACE MOUNT

MOSFET Specification

MOSFET

Manufacturer/Part No.

RDS(on)

ohms (max)

18.50

ID Current

(A)

Qg

Voltage

(V)

Foot Print

Manufacturer

Website

nC (Typ) nC (Max)

N-Ch

VISHAY Si4354DY

VISHAY Si4886DY

9.0

7.0

10.5

20.0

30.0

SO-8

www.vishay.com

13.5

11.0

14.5

30.0

Table 1: SP6136EB Suggested Components and Vendor Lists

Rev 5/01/06

SP6136 Evaluation Manual

Page 4 of 9

LOOP COMPENSATION DESIGN

The open loop gain of the SP6136EB can be divided into the gain of the error amplifier

AMP(S), PWM modulator GPWM, buck converter output stage GOUT(S), and feedback resistor

G

divider GFBK. In order to crossover at the selected frequency fc, the gain of the error amplifier

has to compensate for the attenuation caused by the rest of the loop at this frequency. The

goal of loop compensation is to manipulate the open loop frequency response such that its

gain crosses over 0dB at a slope of –20dB/dec. The open loop crossover frequency should be

higher than the ESR zero of the output capacitors but less than 1/5 of the switching frequency

fs to insure proper operation. Since the SP6136EB is designed with ceramic type output

capacitors, a Type III compensation circuit is required to give a phase boost of 180° in order to

counteract the effects of the output LC under damped resonance double pole frequency.

Figure 11. SP6136EB Voltage Mode Control Loop with Loop Dynamic

Rev 5/01/06

SP6136 Evaluation Manual

Page 5 of 9

The simple guidelines for positioning the poles and zeros and for calculating the component

values for Type III compensation are as follows:

R1 = 68.1K

0.8× R1

R2 =

(sets output voltage)

Vout − 0.8

1

CZ3 =

(sets first zero)

1

ZSF × R1×

LC

2

(

6.28

×

fc

)

×

L

×

Cout

)

+

1 Vramp

×

Vin

RZ2

CZ2

=

(sets the cross-over frequency, fc)

6.28

×

fc

×

CZ3

1

(sets second zero)

1

ZSF

×

RZ2×

LC

1

CP1

RZ3

=

(sets first high-frequency pole)

6.28

×

fs

×

RZ2

CZ3

1

=

(sets second high-frequency pole)

6.28

×

fs

×

Where ZSF=(f compensation double zero)/(f circuit double pole)

Here ZSF is set at 0.8.

As a particular example, consider for the following SP6136EB, 7AMAX with a type III Voltage

Loop Compensation component selections:

Vin = 12V

Vout = 3.30V @ 0 to 7A load

Select L = 2.2 uH => 30% current ripple.

Select Cout = 100uF Ceramic capacitor (Resr

≈ 5mΩ)

fs = 600KHz SP6136ER1 internal Oscillator Frequency

Vramp_pp = 1.0V SP6136ER1 internal Ramp Peak to Peak Amplitude

Rev 5/01/06

SP6136 Evaluation Manual

Page 6 of 9

Step by step design procedures:

a.

b.

c.

d.

e.

f.

R2 = 21.8kΩ

CZ3 = 272pF

Let fc =80kHz then:

RZ2 = 34.4k

Ω

CZ2 = 538pF

CP1 = 7.7pF

g.

h.

RZ3 = 0.97kΩ

CF1 = 22pF to stabilize SP6136ER1 internal Error Amplify

The above component values were used as a starting point for compensating the converter

and after laboratory testing the values shown in circuit schematic of page 1 were used for

optimum operation.

Figure 12- Gain/Phase measurement of SP6136EB shown on page 1, cross-over

frequency (fc) is 85KHz with a corresponding phase of 65 degrees

Rev 5/01/06

SP6136 Evaluation Manual

Page 7 of 9

PCB LAYOUT DRAWINGS

Figure 13. SP6136EB Component Placement

Figure 14. SP6136EB PCB Layout Top Side

Figure 15. SP6136EB PCB Layout Bottom Side

Rev 5/01/06

SP6136 Evaluation Manual

Page 8 of 9

Figure 16. SP6136EB PCB Layout Inner Layer 1 & Inner Layer 2

Table 2: SP6136EB List of Materials

Line

No.

1

Ref.

Des.

PCB

Qty.

Manuf.

Part Number

Layout

Size

Component

Vendor

Phone Number

978-667-7800

402-563-6866

402-563-6867

914-347-2474

402-563-6866

978-779-3111

800-344-4539

1

3

1

Sipex

146-6610-00

1.175"x1.934"

QFN-16

SO-8

SP6136EB

2

3

4

5

6

7

8

U1

MT

MB

L1

SP6136ER1

Si4354DY

Si4886DY

SC7232-2R2M

SD101AWS

Synchronous Buck Controller

NFET, 30V, 18.5mOhm

NFET, 30V, 13.5mOhm

2.2uH Coil 13A 10.4mOhm

Schottky, 60V

Vishay Semi

Inter-Technical

Vishay Semi

TDK

SO-8

7.2x6.6mm

1.5x4.6mm

0603

DBST

C1, CBST, CS

C1608X7R1C104K

C1608JB1H682K

C3225X5R1C226M

C3225X5R0J107M

C2012X5R1A475K

C1608X7R1E103J

C1608X7R1E473K

C1608CH1H120J

C1608CH1H561J

C1608CH1H220J

C1608CH1H271J

ERJ-3EKF6812V

ERJ-3EKF2152V

0.1 uF Ceramic X5R 16V

6.8nF Ceramic X5R 50V

22uF Ceramic X5R 16V

100uF Ceramic X5R 6.3V

4.7uF Ceramic X5R 10V

0.01uF Ceramic X7R 25V

47nF Ceramic X7R 25V

12pF Ceramic COG 50V

560pF Ceramic COG 25V

22pF Ceramic COG 50V

270pF Ceramic COG 50V

68.1K Ohm Thick Film Res 1%

21.5K Ohm Thick Film Res 1%

CSP

CIN

COUT

CVCC

C2

CSS

CP1

CZ2

CF1

CZ3

R1

R2

R3, R4

R5

RZ2

RZ3

TDK

0603

1210

0805

0603

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

TDK

Panasonic

Not populated

Panasonic

Sullins

1

2

1

ERJ-3EKF1002V

ERJ-3EKF3092V

ERJ-3EKF1001V

ERJ-3EKF5111V

ERJ-3EKF2002V

PTC36SAAN

0603

.32x.12

.2x.1

10.0K Ohm Thick Film Res 1%

30.9K Ohm Thick Film Res 1%

1K Thick Film Res 1%

5.11K Ohm Thick Film Res 1%

10K Ohm Thick Film Res 1%

36-Pin (3x12) Header

800-344-4539

800-344-4540

800-344-4539

800-344-4540

800-344-4541

800-344-4539

RS1, RS2

RS3

J1

(J1)

Sullins

STC02SYAN

Shunt

VIN, VOUT, VCC,

GIN, GO, GND, SS,

PWRGD, UVIN

28

9

Vector Electronic

K24C/M

.042 Dia

Test Point Post

800-344-4539

ORDERING INFORMATION

Temperature Range

Model

SP6136EB..…...........................

SP6136ER1.............................

Package Type

C to +85 C.............……..SP6136 Evaluation Board

C to +85°C.....................................…….16-pin QFN

−

40

°

−

°

Rev 5/01/06

SP6136 Evaluation Manual

Page 9 of 9


型号：	SP6136EB
厂家：	SIPEX CORPORATION
描述：	Evaluation Board Manual 评估板手册
文件：	总9页 (文件大小：416K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SP6136EB [SIPEX]

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