BD8627EFV_09_技术文档

System Power Supply for TV Series

FET Controller Type

3ch System Power Supply ICs

BD8627EFV

No.09034EAT05

●Description

BD8627EFV has realized the high performance and reliability required as a power supply for thin-screen TV.

With built-in FET 1ch current mode control, the DC/DC Converter series has the advantage of high-speed load response and

wide phase margin.

Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and

due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application

design.

As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal

protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not

easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for

thin-screen TV which requires the high reliability.

●Features

1) High efficiency in all load area

2) 3.0A output current

3) Low RDS(ON) internal switches (PchMOS:85mΩ, NchMOS:65mΩ)

4) ±1% reference voltage accuracy

5) Programmable frequency : 250kHz-1MHz

6) Terminal RT OPEN/SHORT detecting function

7) Over current protection function

8) Output over voltage/low voltage protection function (over : FB > VREF +60mV , low : FB < VREF -60mV)

9) Timer off latch function in abnormal circumstances

10) Thermal shutdown function

11) Under voltage protection

12) Soft start/start delay circuit

13) Soft start time out function

14) HTSSOP-B20 package

www.rohm.com

2009.05 - Rev.A

1/12

Technical Note

BD8627EFV

●ABSOLUTE MAXIMUM RATING (Ta=25℃)

Parameter

Symbol

V_IN

Limits

7

Unit

V

A

Input supply voltage

Input terminal voltage

Output terminal voltage

Output current

*1

V_INP

V_OUT

V_IN

4

*2

I_OUT

Pd

3

Power dissipation

3.2^＊

W

Operating temperature

Storage temperature

Topr

Tstg

-10 ～ 85

-55 ～ 150

℃

＊1 V_INPApplication terminal： EN, SS/DELAY, TEST, FB

＊2 V_OUTApplication terminal： SW, PDET, FC, RT, REG

＊3 (70mm x 70mm, thickness 1.6mm, and four layer glass epoxy substrates)

When mounting substrate and the package back exposure part are connected with solder.

Operating at higher than Ta=25℃, 25.6mW shall be reduced per 1

Operation condition

Parameter

Input supply voltage

Output current

Symbol

V_IN

I_OUT

MIN

4.5

-

TYP

-

MAX

6.0

3.0

Unit

V

A

www.rohm.com

2009.05 - Rev.A

2/12

Technical Note

BD8627EFV

● Electrical characteristic

(Unless otherwise noted Ta=25℃, V_IN=5.6V)

Specification value

Parameter

Symbol

I_{Q_active}

UNIT

Condition

MIN

-

TYP

1.3

MAX

2.0

700

VIN supply current (operating)

VIN supply current (standby)

mA

μA

V_FB= 0.83V, V_FC= 1V

V_EN= 0V

I_{Q_stby}

350

Reference voltage (VREF)

V_REF

V_OVP

V_LVP

I_PDET

0.792

30

-90

1

0.8

60

-60

-

0.808

90

-30

-

V

Output rise detection voltage

Output decrease detection voltage

Terminal PDET output current

mV

mA

Monitoring FB terminal

V_PDET< 0.5V

Oscillation frequency

Pch FET ON resistance

Nch FET ON resistance

UVLO voltage

SW leak current

f_OSC

R_PFET

R_NFET

V_UVLO

I_LSW

500

-

3.8

-

550

85

65

4.0

0

600

120

100

4.2

1

kHz

mΩ

V

μA

R_OSC= 220kΩ

I

_SW= 1A

_SW= -1A

V_EN= 0V, V_IN= 6V

EN terminal H threshold voltage

EN terminal L threshold voltage

SS/DELAY terminal source current

V_ENH

V_ENL

I_SSSO

2.0

-

2

-

4

-

V

μA

0.5

6

V_FB:FB terminal voltage, V_EN:EN terminal voltage, V_FC:FC terminal voltage, V_PDET: PDET terminal voltage

Current capability should not exceed Pd.

Permissible loss

4

(70mm×70mm, thickness 1.6mm, and four layer glass epoxy

substrates)

When mounting substrate and the package back exposure part are

connected with solder.

3

2

1

0

25

50

75

100

125

150

Surrounding temperature ： Ta [℃]

Fig. 1 heat decrease curve

www.rohm.com

2009.05 - Rev.A

3/12

Technical Note

BD8627EFV

● Block Diagram

Fig.2 Block diagram

●Pin description

No.

1

Symbol

SGND

FB

Description

Signal GND terminal

Explanation

Small signal system GND

2

Feed back terminal

Output voltage detection

Reset output

3

PDET

SW

Off latch signal output

4

Output terminal

Switching output

5

SW

6

PGND

SW

7

Power GND terminal

Output terminal

GND for power MOSFET

Power Mos output

8

9

10

11

12

13

14

15

16

17

SW

VIN

Power supply input. The decoupling is done to

PGND

Power supply input terminal

VIN

REG

EN

Internal regulator

Enable input

Internal regulator

ON/OFF control for device operation

GND short in application set

TEST

TEST terminal

Soft start adjustment capacity connection

terminal

The soft start time is adjusted with the connected

capacitor

18 SS/DELAY

19

20

FC

RT

Error amplifier output

Error amplifier phase compensation point

Frequency adjustment resistance connection The switching frequency is set by the connected

terminal resistance

www.rohm.com

2009.05 - Rev.A

4/12

Technical Note

BD8627EFV

●Pin equivalence circuit diagram

No.

Symbol

Explanation

Terminal equivalent circuit diagram

1

SGND

GND (connected 0V)

VIN

2

FB

PDET

SW

Output voltage detection terminal

Off latch signal output terminal

Output terminal

2

SGND

3

4,5,9,10

Power GND

(Same voltage as SGND)

6,7,8

PGND

VIN

11,12,13,14

Power supply input terminal

www.rohm.com

2009.05 - Rev.A

5/12

Technical Note

BD8627EFV

No.

Symbol

Explanation

Terminal equivalent circuit diagram

VIN

15

REG

Internal regulator output terminal

SGND

VIN

15

16

EN

Enable terminal

SGND

www.rohm.com

2009.05 - Rev.A

6/12

Technical Note

BD8627EFV

No.

Symbol

Explanation

Terminal equivalent circuit diagram

VIN

18

SS

Soft start time adjustment terminal

18

SGND

Error amplifier compensation

terminal

19

FC

VIN

Oscillator frequency adjustment

terminal

20

RT

20

SGND

www.rohm.com

2009.05 - Rev.A

7/12

Technical Note

BD8627EFV

● Operation description

Enable control

The device can be controlled ON/OFF by EN terminal (16 pin) voltage.

An internal circuit starts when VEN reaches 0.65V.

VEN

EN terminal voltage

VENTH

0

VSS

VSSCLM

VSSTH

SS terminal voltage

0

VO

Output setting voltage

0

tSS

VPDET

PDET

0

Fig.3 ON/OFF transition wave form in EN controlling

Soft start time set function

As for BD8627EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS

and SGND terminal.

Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.

www.rohm.com

2009.05 - Rev.A

8/12

Technical Note

BD8627EFV

OSC oscillation frequency setting function

The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND

(range = 250kHz - 1MHz)

The relation between RT terminal resistance and the oscillation frequency follows Fig.4.

10000

1000

100

10

100

1000

10000

RT terminal resistance [kΩ]

Fig. 4 RT resistance-oscillation frequency

www.rohm.com

2009.05 - Rev.A

9/12

Technical Note

BD8627EFV

● Protection function

Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection

operation.

Low voltage protection function (LVP)

The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF.

If FB terminal voltage falls below V_LVP(= VREF -60mV) and the state continues for 500us, output changes to low voltage and

the state is fixed. In that case , PDET (3pin) output changes to L.

Table 1 output low voltage protection function

Low voltage protection Low voltage protection

EN terminal

SS terminal

>1.4V(typ)

FB terminal

function

operation

<V_LVP

>V_LVP

-

ON

OFF

Effective

>V_IHEN

<V_ILEN

<1.4V(typ)

-

Invalidity

OFF

＊ Low voltage protection function is available when SS terminal voltage becomes more than

1.4V (typ) in the transition to ON control (during soft start).

Over voltage protection function(OVP)

The voltage of the terminal FB is compared with internal reference voltage VREF.

If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage

and the state is fixed.

Table 2 output over voltage protection function

Over voltage

protection function

Over voltage

protection operation

EN terminal

SS terminal

>1.4V(typ)

FB terminal

>V_OVP

<V_OVP

ON

Effective

>V_IHEN

<V_ILEN

OFF

<1.4V(typ)

-

Invalidity

＊ Over voltage protection function is available when SS terminal voltage becomes more than

1.4V (typ) in the transition to ON control (during soft start).

V_FB

VREF＋60ｍV

VREF

FB terminal voltage

VREF-60ｍV

0

ON

Protection

500[us]

OVP

500[us]

LVP

OFF

HIGH

LOW

PDET terminal

Fig. 5 Output voltage error detection range

www.rohm.com

2009.05 - Rev.A

10/12

Technical Note

BD8627EFV

Under voltage lock out protection (UVLO)

As for BD8627EFV, the power-supply voltage decrease detection protection circuit is built in.

It the input voltage decrease below the UVLO voltage (4.0V typ), the device state changes to the standby mode (Moreover,

to prevent the chattering of the output) hysteresis width of 300mV(typ) has been installed in the UVLO cancel voltage.

RT terminal open/short protection function (RTO/RTS)

RT terminal opening/short protection function prevent the clock from abnormal oscillation.

If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed.

Terminal RT opening/short protection function is always effective after the power supply start-up.

Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates

when the state continues about 500μsec(typ).

Soft start time-out function

If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8627EFV controls an off latch.

Vo is fixed in a low level.

Fig. 6 Soft start time-out

Error detection (off latch) release method

BD8627EFV enters the state of an off latch when the protection function operates.

To release the off latch state, EN terminal voltage should be changed to low level once time.

Thermal shut down function

Thermal shut down circuit (TSD circuit) is built into BD8627EFV. When the temperature of the chip exceeds Tjmax=175, the

DC/DC converter is fixed in a low voltage.

TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175.

It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set.

Over current protection function

The over current protection function has been achieved by limiting the current that flows on high side MOSFET.

The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about

500μsec(typ), the output is fixed in a low level.

www.rohm.com

2009.05 - Rev.A

11/12

Technical Note

BD8627EFV

●Ordering part number

B D

8

6

2

7

E

F

V

-

E

2

Part No

Part No.

Package

EFV: HTSSOP-B24

Packaging and forming specification

E2: Embossed tape and reel

HTSSOP-B20

Tape

Embossed carrier tape

6.5 0.1

Quantity

2500pcs

20

11

Direction

of feed

E2

(The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand)

1

10

+0.05

−0.03

0.325

0.17

S

0.08

S

0.65

0.2 −⁺0⁰.^.004⁵

Direction of feed

1pin

Reel

（Unit:mm)

※When you order , please order in times the amount of package quantity.

www.rohm.com

2009.05 - Rev.A

12/12

Notice

N o t e s

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content speciﬁed herein is subject to change for improvement without notice.

The content speciﬁed herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the speciﬁcations,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information speciﬁed herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products speciﬁed in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, ofﬁce-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products speciﬁed in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

against the possibility of physical injury, ﬁre or any other damage caused in the event of the

failure of any Product, such as derating, redundancy, ﬁre control and fail-safe designs. ROHM

shall bear no responsibility whatsoever for your use of any Product outside of the prescribed

scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or

system which requires an extremely high level of reliability the failure or malfunction of which

may result in a direct threat to human life or create a risk of human injury (such as a medical

instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,

fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of

any of the Products for the above special purposes. If a Product is intended to be used for any

such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology speciﬁed herein that may

be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to

obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.

More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

http://www.rohm.com/contact/

www.rohm.com

R0039

A


型号：	BD8627EFV_09
厂家：	ROHM
描述：	FET Controller Type 3ch System Power Supply ICs FET控制器类型3通道系统电源IC 控制器
文件：	总13页 (文件大小：369K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BD8627EFV_09 [ROHM]

相关型号：

BD8628EFV

BD8628EFV-E2

BD8628EFV_09

BD8629FS

BD8629FS-E2

BD8629FS_09

BD863

BD864

BD8641EFV

BD8641EFV-E2

BD8643FV

BD8643FV-E2