BD8624EFV-E2_技术文档

System Power Supply for TV Series

FET Controller Type

3ch System Power Supply ICs

BD8628EFV, BD8624EFV

No.09034EAT06

●Description

BD8628EFV / BD8624EFV have 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) 11ch synchronous rectification step-down system DC/DC converter

2) Soft start, soft off function

3) Built-in low voltage / overvoltage protection function

4) Built-in overcurrent protection function

5) Frequency setting by external resistance is available. (RT terminal)

6) Protection time setting by external resistance is available. (RSET terminal)

7) Built-in RT / RSET terminal open/short protection function

8) Protection control with built-in sequencer

9) Built-in adjustment function time of off latch

10) Built-in error state detection signal output function

11) Built-in tracking function

12) Corresponded to protecting bus

13) Load current Maximum 3A

14) HTSSOP-B24 Package

www.rohm.com

2009.05 - Rev.A

1/14

Technical Note

BD8628EFV, BD8624EFV

●Electric characteristic

(Ta=25℃, VCC=6.5V, GND=0V,CTL=6.5V unless otherwise specified.)

specification value

Parameter

Symbol

UNIT

Condition

MIN

TYP

0

MAX

Circuit current 1

Circuit current 2

I_Q1

I_Q2

-

10

-

μA

mA

CTL=0V

3.4

CTL=VCC

< Error amplifier part >

Terminal FB and FC

terminal short

V_FB=0.9V

V_FB=0.7V

V_FB=0.9V

Standard voltage (VREF)

V_REF

0.792

0.8

0

-

0.808

V

Terminal FB Input bias current

Terminal FC Clamping voltage H

Terminal FC Clamping voltage L

Terminal FC Sink current

Terminal FC Source current

Open loop gain

I_FBB

V_FCH

V_FCL

I_FCSINK

I_FCSOURCE

A_VERR

-1

1.8

-

0.5

-

1

-

0.2

-

-70

-

μA

V

mA

μA

dB

V_FB=0.9V, V_FC=0.4V

V_FB=0.7V, V_FC=1.6V

-

100

When terminal RT 27kΩ is

connected

Oscillation frequency

F_OSC

400

500

600

kHz

Charging current

I_SS

-3

0.98

2.2

0.1

49

-2.5

1.08

2.4

0.15

70

-2

1.18

-

91

μA

V

kΩ

V

_SS=1.0V

Terminal SS Threshold voltage

Terminal SS Clamping voltage

Terminal SS Standby voltage

Terminal SS Discharge resistance

Terminal SS Protection circuit start

voltage

V_SSTH

V_SSCLM

V_SSSTB

R_SS

V_{SS Voltage}

V_{SS Voltage}(L to H)

CTL=0V

V_SSPON

1.0

1.1

1.2

V

V_{SS Voltage}(L to H)

Terminal SS Protection circuit start

voltage

V_{SSPON_HYS}

10

100

200

mV

V_{SS Voltage}

Maximum hysteresis error

< Low voltage, over voltage detection part>

Terminal FB Low voltage detection

voltage

Terminal FB Overvoltage detection

voltage

< Over current detection part>

Output current limitation threshold

V_LVP

V_OVP

I_lmt

0.51

0.86

0.56

0.96

0.61

1.06

V

V_{FB Voltage}

VCC-0.9 VCC-0.7 VCC-0.5

V

V_{SW Voltage}

Upper side MOS ON resistance

Lower side MOS ON resistance

R_ONU

R_ONL

-

110

-

mΩ

V_BOOT-V_SW=5V

V_VREG5=5V

Terminal PDET L output voltage

Terminal CTL input voltage H level

voltage

V_{OL_PDET}

V_{IH_CTL}

-

0.4

V

I_OL=100uA

2.0

VCC

CTL terminal

Terminal CTL input voltage L level

voltage

V_{IL_CTL}

I_{I_CTL}

-

0.5

90

V

CTL terminal

CTL terminal, CTL=VCC

Terminal CTL input current

60

μA

V_FB: FB terminal voltage, V_FC: FC terminal voltage, V_SS: SS terminal voltage, V_MONVCC: MONVCC terminal voltage

Not designed for radiation resistance.

Current capability should not exceed Pd.

www.rohm.com

2009.05 - Rev.A

2/14

Technical Note

BD8628EFV, BD8624EFV

Permissible loss

This package is a product of which the feature is the high heat radiation, and connect the back to GND

based on recommended land pattern when you mount.

T _{j max}

cmax

T

Destruction Destruction

temperature temperature

T _STGmin

T _STGmax

T _{a min}

T _{a max}

jc

ja

θ

[

/W]

[

/W]

℃

[

]

[

]

[

]

[

℃

]

℃

[

]

[

]

℃

19.0

31.3

-50.0

150.0

-45.0

85.0

150.0

5

4

3

2

1

0

ROHM standard

substrate mounting

θja=31.3℃/W

0

25

50

75

100

125

150

Ambient temperature ： Ta [℃]

ROHM standard substrate specification

Material 4 layer glass epoxy substrate(back copper foil70mm x 70mm)

Size 70mm x 70mm x 1.6mmt(Sarmalbiaing is in the substrate.)

Figure.1 Heat decrease curve

※These values are the actual measurement values, and no guarantee values.

www.rohm.com

2009.05 - Rev.A

3/14

Technical Note

BD8628EFV, BD8624EFV

●Block diagram

VREF

RT

SS

FB

OSC

OPEN/SHORT

OSC

RSET

m t i e

OVP

LVP

PDET

PIO

FC

PROTECT

BUS

I/F

SEQ

Control

GND

VREG5

CTL

VCC

CTL

VREG5

BOOT

SW

Driver

Control

PVCC

TEST2

TEST1

N.C.

SW

N.C.

PGND

N.C.

Figure.2 Block diagram, Application diagram

●Terminal explan ation

Table 1 Terminal explanation

No.

1

Symbol

Description

No.

13

14

15

16

Symbol

Description

Frequency adjustment resistance

connection terminal

Off latch effective time adjustment

resistance terminal

PGND Power GND terminal

RT

2

RSET

PDET

PIO

No wire connection.

N.C.

3

Error state notification terminal

(Connect to GND. )

No wire connection.

(Connect to GND. )

Error state notification

and external IC error detection terminal

4

N.C

5

6

SW

SW terminal

17

18

CTL

Enable input

VCC

VCC power supply terminal

High side Power MOS gate drive

power source terminal

Internal power supply (5.0V) output

terminal

7

8

BOOT

19

20

PVCC

Power VCC terminal

VREG5

9

GND

FC

GND

21

22

TEST2 Test terminal (Connect to GND. )

TEST1 Test terminal (Connect to GND. )

10

Phase amends terminal

No wire connection.

(Connect to GND. )

No wire connection.

(Connect to GND. )

11

12

FB

SS

Feedback terminal

23

24

N.C.

Soft start adjustment capacity

connection terminal

N.C.

※Please give to VCC+0.3V as an operation condition in all input terminals except the terminal BOOT.

However, please do not exceed the absolute maximum rating as VCC=PVCC.

www.rohm.com

2009.05 - Rev.A

4/14

Technical Note

BD8628EFV, BD8624EFV

●Terminal equivalent circuit chart

Terminal

No.

Terminal

name

Explanation

Power GND

Terminal equivalent circuit chart

1

2

PGND

(The same potential as the GND

terminal)

Power GND

(The same potential as the GND

terminal)

PVCC

5

6

SW

SW terminal

⑤

⑥

PGND

VREG5

High side Power MOS gate drive

power source terminal

⑦

7

BOOT

PGND

Internal power supply (5.0V) output

terminal

8

9

VREG5

GND

10

FC

Phase amends terminal

www.rohm.com

2009.05 - Rev.A

5/14

Technical Note

BD8628EFV, BD8624EFV

Terminal

No.

Terminal

name

Explanation

Terminal equivalent circuit chart

VCC

11

FB

Voltage detection terminal

⑪

GND

Soft start adjustment capacity

connection terminal

12

SS

Frequency adjustment resistance

connection terminal

13

14

RT

Off latch effective time adjustment

resistance terminal

RSET

15

PDET

Error state notification terminal

www.rohm.com

2009.05 - Rev.A

6/14

Technical Note

BD8628EFV, BD8624EFV

Terminal

No.

Terminal

name

Explanation

Terminal equivalent circuit chart

Error state notification and external

IC error detection terminal

16

PIO

17

21

22

CTL

Enable input

TEST2

TEST1

Test terminal (Connect to GND. )

19

20

PVCC

Power VCC terminal

www.rohm.com

2009.05 - Rev.A

7/14

Technical Note

BD8628EFV, BD8624EFV

●Operation description

ON/OFF control

DC/DC converter ON/OFF function

DC/DC converter controller can be controlled ON/OFF by CTL terminal.

Analog circuit starts operation at ON control (on mode), and goes down to setting output voltage.

Analog circuit should be standby at OFF control (off mode), and output voltage becomes 0V.

Table2 DC/DC converter ON/OFF function

CTL terminal voltage

>VIHCTL

<VILCTL

ON control

OFF control

Soft start time set function

DC/DC converter can do soft start without overshoot by charging soft start capacity (Css) connected between SS terminal

and GND by charging current at ON control.

The mute of the output is released when it reaches V_SS=0.15V (V_SSSTB), and the output voltage does the soft start

operation from the point of V_SS=0.3V (typ) in proportion to the voltage of the terminal SS.

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

Soft start time (tss) should be set at 3msec < tss < 30msec.

※Please note that the overshoot is not caused in the output setting voltage when setting it to tss≦3msec.

V_SSTH C_SS

t_SS



I_SS

Discharge function

DC/DC converter can do soft off by discharging load discharged to soft start capacity connected between SS terminal to

GND by discharging resistance at OFF control.

Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ).

Figure.3 Wave form at ON/OFF control

www.rohm.com

2009.05 - Rev.A

8/14

Technical Note

BD8628EFV, BD8624EFV

OSC oscillation frequency setting function

SW output oscillation frequency of DC/DC converter can be set by installing resistance between RT terminal and GND

externally.

10000

1000

100

10

1

10

100

1000

*Reference date

RT

resistance[KΩ]

terminal

Figure.4 Terminal RT resistance-oscillation frequency

Range of terminal RT connection resistance setting

23kΩ≦Rrt≦135kΩ

(100kHz≦fosc≦600kHz)

www.rohm.com

2009.05 - Rev.A

9/14

Technical Note

BD8628EFV, BD8624EFV

PROTECT BUS Input/output function

The terminal PIO is PROTECT BUS Input/output terminal. The terminal PIO is Hi-Z when DC/DC usually operates. When the

terminal PIO becomes LOW by connecting PROTECT BUS, DC/DC is turned off. Afterwards, when the terminal PIO

becomes HIGH, it reactivates.

DC/DC is Off latch when DC/DC error detects it and the terminal PDET becomes LOW.

Table3 PIO terminal, PDET terminal output function

DC/DC

PIO terminal

PDET terminal

DC/DC

Error detection

Undetection

Detection

Hi-Z

LOW

Hi-Z

LOW

ON

OFF

Off latch

PROTECT BUS Timing chart

If two or more BD8628EFV//BD8624FV is connected in PROTECT BUS, and it uses at the same time,

when one IC error detects, all remaining IC becomes PIO = Low at the same time, and the output is turned off.

Protecting BUS part timing chart

IC_A detects error.

OFF LATCH

High

IC_A

PDET

PIO

LOW

IC_A

PIO

IC_A

PIO

High

IC_B

PIO

LOW

IC_B

Vo

DC/DC OFF

0V

High

IC_B

PDET

When two or more BD8628EFV/BD8624FV is used at the same time,

If one IC error detects, all IC becomes DC/DC OFF at the same time.

www.rohm.com

2009.05 - Rev.A

10/14

Technical Note

BD8628EFV, BD8624EFV

●Protection function

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

Low voltage protection function(LVP)

Low voltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter compared

to internal reference level.

Low voltage protection function operates when FB terminal voltage falls below VLVP (=0.7 x VREF) and continues more than

set time in external resistance.

Table 4 Low voltage protection function

CTL

terminal

Low voltage

protection function

Low voltage

protection operation

SS terminal

>1.1V(typ)

FB terminal

<VLVP

>VLVP+VLVP_HYS

ON

Enable

>VIHCTL

OFF

<1.0V(typ)

-

Disable

<VILCTL

※Constant voltage protection function is enabled when SS terminal voltage becomes more than 1.1V (typ) in the

transition to ON control (during soft start).

Overvoltage protection function (OVP)

Overvoltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter controller

compared to internal reference level.

Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.2 x VREF) and continues more than

set time in external resistance.

Table 5 Overvoltage protection function

CTL

terminal

Overvoltage protection Overvoltage protection

SS terminal

>1.1V(typ)

FB terminal

function

operation

>VOVP

<VOVP

ON

OFF

Enable

>VIHCTL

<VILCTL

<1.0V(typ)

-

Disable

OFF

※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in

the transition to ON control (during soft start).

V_FB

1.2×VREF

FB

VREF

terminal voltage

0.7×VREF+V^LVP_HYS

0.7×VREF

0

ON

Protection

OFF

LVP

OVP

LVP

Hi-Z

PDET

terminal

LOW

Figure.5 Low voltage / overvoltage protection

www.rohm.com

2009.05 - Rev.A

11/14

Technical Note

BD8628EFV, BD8624EFV

Overcurrent protection function (OCP)

Overcurrent protection function compared drain voltage (LX terminal voltage) with internal OCP terminal voltage when

internal Nch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS

would be OFF.

Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and

continues more than set time in external resistance.

Table 6 overcurrent protection function

CTL

terminal

Overcurrent

protection function

Overcurrent

protection operation

SS terminal

>1.1V(typ)

Output current

>Ilmt

<Ilmt

-

ON

Enable

>VIHCTL

<VILCTL

OFF

<1.0V(typ)

-

Disable

LX terminal voltage

OCP

terminal

voltage

Immediately

off.

Immediately

off.

Immediately

off.

DRVA

DRVB

Output

current

To an off latch in continuance

of set time (typ) in external

resistance

Output current

Set time in

external

resistance

Rocp

LX

ON

Protection

OFF

OCP

Off operation immediately

Off latch

Figure.6 Overcurrent protection

RT terminal open/short protection function

RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short condition

internally from RT terminal to prevent from output voltage error caused by error oscillation of internal triangular wave at RT

terminal open/short.

RT terminal open/short protection function is regularly enabled after boot-up.

RT terminal open/short protection function operates when error detection condition continues more than set time in external

resistance.

www.rohm.com

2009.05 - Rev.A

12/14

Technical Note

BD8628EFV, BD8624EFV

Soft start time-out function

DC/DC converter off-latch-controls when V_SSdoes not exceed V_SSPONfrom V_SS> V_SSSTB+V_{SSSTB_HYS}after 50msec (typ)

passed from soft start.

VSSCLM

VSSPON

SS terminal

VSSSTB+VSSSTB_HYS

0V

About 50msec（ｔｙp）

Figure.7 At soft start time-out

Error detection (off latch) release method

DC/DC converter becomes off latch condition when protection function operates. Off latch can be released by the following

method. DC/DC converter controller of each Ch becomes able to do ON control transition by releasing off latch.

1. Set all Ch CTL terminal voltage as < V_ILCTLand continue that condition about more than 200usec (typ).

2. Drop down power supply VCC to below 2.7V(TYP).

Error detection time set function

Time from the error detection to the off latch can be set by putting resistance outside between GND and RSET terminal.

t_offlatch 1.810^3Rrset [usec]

Rset setting range

10kΩ≦Rset≦75kΩ

(18usec≦tofflach≦135usec)

www.rohm.com

2009.05 - Rev.A

13/14

Technical Note

BD8628EFV, BD8624EFV

●Ordering part number

B D

8

6

2

8

E

F

V

-

E

2

Part No

Part No.

8628

8624

Package

EFV: HTSSOP-B24

Packaging and forming specification

E2: Embossed tape and reel

HTSSOP-B24

Tape

Embossed carrier tape

Quantity

2000pcs

7.8 0.1

+6

−4

4

Direction

of feed

E2

24

13

(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)

+0.05

−0.03

1

12

0.17

0.08

0.325

S

0.65

+0.05

−0.04

0.2

M

0.08

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

14/14

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/

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R0039

A


型号：	BD8624EFV-E2
厂家：	ROHM
描述：	Switching Regulator, Current-mode, 600kHz Switching Freq-Max, PDSO24, ROHS COMPLIANT, HTSSOP-24 开关光电二极管
文件：	总15页 (文件大小：349K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BD8624EFV-E2 [ROHM]

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