HV9967BK7-G - Supertex, Inc. - Datasheet.Directory

Supertex inc. HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Features

►3% accurate LED current

►Integrated 60V, 0.8Ω MOSFET

►Low sensitivity to external component variation

►Single resistor LED current setting

►Fixed off-time control

►PWM dimming input

►Output short circuit protection with skip mode

►Over-temperature protection

►Available in compact 8-Lead MSOP and 8-Lead

DFN packages

Applications

►DC/DC or AC/DC LED drivers

►RGB backlighting drivers for at panel displays

►General purpose constant current source

►Signage and decorative LED lighting

►Chargers

General Description

The HV9967B is an average-mode current control LED driver IC

operating in a constant off-time mode.

The IC features an integrated 60V, 0.8Ω MOSFET that can be

used as a stand-alone buck converter switch, or connected as a

source driver for driving an external high-voltage depletion-mode

MOSFET. The HV9967B is powered through its switching output

when the integrated switch is off. Hence, the same external

MOSFET can be used as a high-voltage linear regulator for

powering the IC.

The LED current is programmed with one external resistor. The

average-mode current control method does not produce a peak-

to-average error, and therefore greatly improves current accuracy

and line and load regulation of the LED current without any need

for loop compensation or direct sensing of the LED current at a

high-voltage potential. The auto-zero circuit cancels the effects of

the input offset voltage and of the propagation delay of the current

sense comparator.

Typical Application Circuit

Integrated LED Driver

with Average-Mode Current Control

CIN

CDD

LED

String

HV9967B

RSENSE

VDD

PGND

PWMD

RSENSE 8

AGND

8.0 - 60VDC

HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Absolute Maximum Ratings*

Parameter Value

SW to GND -0.5V to +65V

VDD to GND -0.3V to 6.0V

Other I/O to GND -0.3V to (VDD + 0.3V)

RT, ISET 2.0mA

Continuous power dissipation (TA = +25°C)

8-Lead DFN (K7)

8-Lead MSOP (MG)

1.6W

350mW

Junction temperature -40°C to +150°C

Storage temperature range -65°C to +150°C

Pin Congurations

Product Marking

8-Lead DFN (K7)

(top view)

Electrical Characteristics

(The * denotes specications which apply over the full operating ambient temperature range of -40°C < TA < 125°C. Otherwise specications are at TA =

25°C. VSW = 10V/5mA, VDD = 5.0V unless otherwise noted)

Package may or may not include the following marks: Si or

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 in

the operational sections of the specications is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

Sym Description Min Typ Max Units Conditions

Input

VSWDC Input DC supply voltage range * 8.0 -60 V DC input voltage

IINSD Shut-down mode supply current - - 0.5 1.0 mA Pin PWMD to GND

8-Lead MSOP (MG)

(top view)

GND

RSENSE

PGND

PWMD

VDD

AGND

RSENSE

PGND

PWMD

VDD

AGND

H67B

YWLL

Y = Last Digit of Year Sealed

W = Code for Week Sealed

L = Lot Number

= “Green” Packaging

L = Lot Number

YY = Year Sealed

WW = Week Sealed

= “Green” Packaging

967B

LLLL

YYWW

Bottom Marking

Notes:

# Not production tested; guaranteed by design or characterization.

* Specications apply over the full operating ambient temperature range of -40°C < TA < +125°C.

-G indicates package is RoHS compliant (‘Green’)

Ordering Information

Part Number Package Options Packing

HV9967BK7-G 8-Lead DFN (3x3mm) 3000/Reel

HV9967BMG-G 8-Lead SOIC 2500/Reel

Package may or may not include the following marks: Si or

HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Sym Description Min Typ Max Units Conditions

Internal Regulator

VDD Internally regulated voltage - 4.70 5.00 5.20 VPWMD = VDD; RT = 100kΩ

UVLO VDD undervoltage lockout threshold *4.10 - 4.70 VVDD rising, as needed to

ensure IC(MIN)

ΔUVLO VDD undervoltage lockout hysteresis - - 150 - mV VDD falling

PWM Dimming

VEN(LO) PWMD input low voltage *- - 0.8 V ---

VEN(HI) PWMD input high voltage * 2.0 - - V---

REN Internal pull down resistance at PWMD - 50 100 150 kΩ VPWMD = 5.0V

Current Control

VCS(TH) RSENSE current threshold - 243 - 257 mV ---

dVCS/dtOTemperature regulation - - 0.1 -mV/OC

TBLANK Current sense blanking interval *140 - 290 ns ---

TON(MIN) Minimum ON-time *- - 950 ns VRSENSE = VCS(TH) + 50mV

DMAX Maximum steady-state duty cycle * 80 - - %

Reduction in output LED

current occurs beyond this

duty cycle due to saturation

of T2 timers.

Short Circuit Protection

VCS(SHORT) Hiccup threshold voltage at RSENSE *355 - 440 mV ---

TDELAY Current limit delay RSENSE to SW-OFF - - - 150 ns VRSENSE = VCS(SHORT) + 50mV

THICCUP Hiccup time - - 800 - μs ---

TON(MIN) Minimum ON-time (short circuit) - - - 400 ns VRSENSE = VCS(SHORT) + 50mV

TOFF Timer

TOFF OFF time *

28 40 48

μs

RT = 400kΩ

7.0 10 12 RT = 100kΩ

0.7 1.0 1.2 RT = 10kΩ

SW Output

RON ON resistance - - 0.8 - Ω VDD = 5.0V

ICContinuous current * 0.75 - - AVDD = 4.75V,

VRSENSE = 370mV, VSW =10V

Over-temperature Protection

TSD Shut-down temperature #125 - - OC---

ΔTSD Hysteresis # -20 -OC---

Electrical Characteristics (cont.)

(The * denotes specications which apply over the full operating ambient temperature range of -40°C < TA < 125°C. Otherwise specications are at TA =

25°C. VSW = 10V/5mA, VDD = 5.0V unless otherwise noted)

Notes:

# Not production tested; guaranteed by design or characterization.

* Specications apply over the full operating ambient temperature range of -40°C < TA < +125°C.

HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Functional Block Diagram

OFF

Timer

0.8ms

VDD

POR

SET

REG

UVLO

OTP

4.35V

100kΩ

RSENSE

PWMD

PGND

AGND

HV9967B

L/E

Blanking

Average

Current

Control Logic

OUT

0.4V

PGND

General description

The HV9967B employs Supertex’ proprietary control scheme,

achieving fast and very accurate control of average current

in the buck inductor through sensing the switch current only.

No compensation of the current control loop is required. The

LED current response to PWMD input is similar to that of the

peak-current control ICs, such as HV9910B. The inductor

current ripple amplitude does not affect this control scheme

signicantly, and therefore, the LED current is independent

of the variation in inductance, switching frequency or output

voltage. Constant off-time control of the buck converter is

used for stability and to reduce input voltage regulation of

the LED current.

OFF Timer

The timing resistor connected to RT determines the off-time

of the gate driver, and it must be wired to VDD. The equation

governing the off-time of the GATE output is given by:

TOFF = RT • 100pF (1)

within the range of 10kΩ ≤ RT ≤ 400kΩ.

Average Current Control Feedback and Output

Short Circuit Protection

The constant-current control feedback derives the aver-

age current signal from the source current of the switching

MOSFET. This current is detected using a sense resistor at

the RSENSE pin. The feedback operates in a fast open-loop

mode. No compensation is required. Output current is pro-

grammed simply as:

ILED = 0.25V (2)

RCS

The above equation is only valid for continuous conduction

of the output inductor. It is a good practice to design the in-

ductor such that the switching ripple current in it is 30~40%

of its average full load DC current peak-to-peak. Hence, the

recommended inductance can be calculated as:

LO =

VO(MAX) • TOFF (3)

0.4 • IO

The duty-cycle range of the current control feedback is lim-

ited to D ≤ 0.8. A reduction in the LED current may occur

when the LED string voltage VO is greater than 80% of the

input voltage VIN of the HV9967B LED driver.

Application Information

HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Reducing the output LED voltage VO below VO(MIN) = VIN • DMIN,

where DMIN = 0.8µs/(TOFF + 0.8µs), may also result in the loss

of regulation of the LED current. This condition, however,

causes increase in the LED current and can potentially trip

the short-circuit protection comparator threshold.

The short circuit protection comparator trips when the volt-

age at RSENSE exceeds 0.4V. When this occurs, the SW

off-time THICCUP = 800µs is generated to prevent stair-casing

of the inductor current and potentially its saturation due to

insufcient output voltage. The typical short-circuit current is

shown in the waveform of Fig. 1.

Fig.1. Short-circuit inductor current.

A leading-edge blanking delay is provided at RSENSE to

prevent false triggering of the current feedback and the short

circuit protection.

SW Input and Linear Regulator

HV9967B includes an integrated 60V, 0.8Ω switching

MOSFET at the SW input. The power for the IC is supplied

from a linear 5.0V regulator that is also derived from the SW

input.

PWM Dimming

The HV9967B features a TTL compatible dimming input

PWMD. Applying a square-wave voltage to PWMD will mod-

ulate the duty ratio of the LED current accordingly. The rising

and falling edges are limited by the current slew rate in the

inductor. The rst switching cycle is terminated upon reach-

ing the 250mV level at RSENSE. The circuit will reach the

steady state within 3~4 switching cycles regardless of the

switching frequency.

Over-Temperature Protection

The HV9967B includes over-temperature protection. Typi-

cally, when the junction temperature exceeds 145OC, switch-

ing of the SW input is disabled. The switching resumes when

the temperature falls by approximately 20OC from the trip

point.

800µs

0.44V/R

SENSE

Pin Description

Pin # Function Description

1SW Drain of 60V 0.8Ω NDMOS switch and input of H/V regulator.

2RSENSE Source of NDMOS switch and current sense input.

Connect a resistor to GND to program the output current and short circuit thresholds.

3PGND Power ground. Must be wired to AGND on PCB.

4 PWMD PWM dimming input. This TTL input enables switching of SW when in high state.

5 NC No connection.

6RT Resistor connected between RT and VDD programs the off-time of SW.

7AGND Analog ground (0V).

8 VDD Power supply for all internal circuits. Bypass with a low ESR capacitor to PGND (>0.5μF).

Connect GATE of external depletion-mode NFET for high-voltage operation.

HV9967B

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

8-Lead DFN Package Outline (K7)

3.00x3.00mm body, 0.80mm height (max), 0.65mm pitch

Symbol A A1 A3 b D D2 E E2 e L L1 θ

Dimension

(mm)

MIN 0.70 0.00

0.20

REF

0.25 2.85* 1.60 2.85* 1.35

0.65

BSC

0.30 0.00* 0O

NOM 0.75 0.02 0.30 3.00 -3.00 - 0.40 - -

MAX 0.80 0.05 0.35 3.15* 2.50 3.15* 1.75 0.50 0.15 14O

JEDEC Registration MO-229, Variation WEEC-2, Issue C, Aug. 2003.

* This dimension is not specied in the JEDEC drawing.

Drawings not to scale.

Supertex Doc. #: DSPD-8DFNK73X3P065, Version C081109.

Seating

Plane

Top View

Side View

Bottom View

View B

Note 1

(Index Area

D/2 x E/2)

Note 3

Note 2

Note 1

(Index Area

D/2 x E/2)

Notes:

1. A Pin 1 identier must be located in the index area indicated. The Pin 1 identier can be: a molded mark/identier; an embedded metal marker; or

a printed indicator.

2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present.

3. The inner tip of the lead may be either rounded or square.

Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives

an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability

to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and

specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

HV9967B

(The package drawing(s) in this data sheet may not reect the most current specications. For the latest package outline

information go to http://www.supertex.com/packaging.html.)

Seating

Plane

Gauge

Plane

AA2

Seating

Plane

Top View

Side View View A-A

View B

θ1 (x4)

Note 1

(Index Area

D/2 x E1/2)

Symbol A A1 A2 b D E E1 e L L1 L2 θ θ1

Dimension

(mm)

MIN 0.75* 0.00 0.75 0.22 2.80* 4.65* 2.80*

0.65

BSC

0.40

0.95

REF

0.25

BSC

0O5O

NOM - - 0.85 - 3.00 4.90 3.00 0.60 - -

MAX 1.10 0.15 0.95 0.38 3.20* 5.15* 3.20* 0.80 8O15O

JEDEC Registration MO-187, Variation AA, Issue E, Dec. 2004.

* This dimension is not specied in the JEDEC drawing.

Drawings are not to scale.

Supertex Doc. #: DSPD-8MSOPMG, Version H041309.

Note:

1. A Pin 1 identier must be located in the index area indicated. The Pin 1 identier can be: a molded mark/identier; an embedded metal marker; or

a printed indicator.

8-Lead MSOP Package Outline (MG)

3.00x3.00mm body, 1.10mm height (max), 0.65mm pitch

Doc.# DSFP-HV9967B

B042312