HV9967B
Integrated LED Driver with Average-Mode Current Control
Features
General Description
•
•
•
•
•
•
•
•
The HV9967B is an Average-mode current control LED
driver IC operating in a Constant Off-time mode.
3% Accurate LED Current
60V, 0.8Ω Integrated 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
Overtemperature Protection
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. Therefore, the same external
MOSFET can be used as a high-voltage linear
regulator for powering the IC.
Applications
•
•
•
•
•
The LED current is programmed with one external
resistor. The Average-mode current control method
does not produce a peak-to-average error. This greatly
improves the current accuracy as well as the line and
load regulations 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.
DC/DC or AC/DC LED Drivers
RGB Backlighting Drivers for Flat Panel Displays
General Purpose Constant-Current Source
Signage and Decorative LED Lighting
Chargers
Package Types
8-lead DFN
(Top view)
8-lead MSOP
(Top view)
SW 1
SW 1
8
VDD
RSENSE 2
7
AGND
PGND 3
6
RT
PGND 3
PWMD 4
5
NC
PWMD 4
RSENSE 2
GND
8
VDD
7
AGND
6
RT
5
NC
See Table 2-1 for pin information.
2020 Microchip Technology Inc.
DS20005734A-page 1
HV9967B
Functional Block Diagram
VDD
HV9967B
4.35V
UVLO
VCS
REG
POR
L/E
Blanking
IN
SW
Average
Current
Control Logic
OTP
RSENSE
VCS
OUT
100kΩ
RQ
0.4V
Short-Circuit
Overcurrent
Comparator
PGND
S Q
SET
PWMD
PGND
AGND
TOFF
Timer
i
0.8ms
Hiccup Time
RT
DS20005734A-page 2
2020 Microchip Technology Inc.
HV9967B
Typical Application Circuit
8 VDC to 60 VDC
+
CO
D1
CIN
LED
String
U1
4
2
RSENSE
SW
PWMD
1
L1
HV9967B
RSENSE
PGND AGND
3
7
VDD
RT
8
6
CDD
RT
2020 Microchip Technology Inc.
DS20005734A-page 3
HV9967B
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
SW to GND ..............................................................................................................................................–0.5V to +65V
VDD to GND...................................................................................................................................................–0.3V to 6V
Other I/O to GND ..........................................................................................................................–0.3V to (VDD + 0.3V)
IRT............................................................................................................................................................................ 2 mA
Junction Temperature Range, TJ ......................................................................................................... –40°C to +150°C
Storage Temperature Range, TS .......................................................................................................... –65°C to +150°C
Continuous Power Dissipation (TA = +25°C):
8-lead MSOP .................................................................................................................................... 350 mW
8-lead DFN ............................................................................................................................................ 1.6W
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only, and functional operation of the device at those or any other conditions above those
indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for
extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: TA = 25°C, VSW = 10V/10 mA, VDD = 5V unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Max.
Unit
Conditions
VSWDC
8
—
60
V
IINSD
—
0.5
1
mA
VDD
4.7
5
5.2
V
VUVLOR
4.1
4.35
4.7
V
∆VUVLO
—
150
—
mV
VDD falling
VEN(LO)
VEN(HI)
REN
—
2
50
—
—
100
0.8
—
150
V
V
kΩ
(Note 1)
(Note 1)
VPWMD = 5V
VCS(TH)
243
250
257
mV
dVCS/dT
—
0.1
—
mV/°C
TBLANK
140
—
290
TON(MIN)
—
—
950
ns
ns
DMAX
80
—
—
INPUT
Input DC Supply Voltage Range
Shutdown Mode Supply Current
INTERNAL REGULATOR
Internally Regulated Voltage
VDD Undervoltage Lockout Upper
Threshold
VDD Undervoltage Lockout
Hysteresis
PMW DIMMING
PWMD Input Low Voltage
PWMD Input High Voltage
PWMD Pull-Down Resistance
CURRENT CONTROL
RSENSE Current Threshold Voltage
Threshold Voltage Temperature
Coefficient
Current Sense Blanking Interval
Minimum On-Time
Maximum Steady-State Duty Cycle
%
DC input voltage
(Note 1)
Pin PWMD connected to GND
VPWMD = VDD, RT = 100 kΩ
VDD rising, as needed to
ensure IC(MIN) (Note 1)
(Note 1)
VRSENSE = VCS(TH) + 50 mV
(Note 1)
Reduction in output LED current may occur beyond this
duty cycle. (Note 1)
SHORT-CIRCUIT PROTECTION
Hiccup Threshold Voltage at
VCS(SHORT)
355
400
440
mV
(Note 1)
RSENSE
VRSENSE = VCS(SHORT)
Current Limit Delay RSENSE to
TDELAY
—
—
150
ns
SW-OFF
+ 50 mV
Note 1: Denotes specifications which apply over the full operating ambient temperature range of
–40°C < TA < +125°C
2: For design guidance only
DS20005734A-page 4
2020 Microchip Technology Inc.
HV9967B
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: TA = 25°C, VSW = 10V/10 mA, VDD = 5V unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Max.
Unit
THICCUP
—
800
—
μs
TON(MIN),SC
—
—
400
ns
VRSENSE = VCS(SHORT)
+ 50 mV
Off Time
TOFF
28
7
0.7
40
10
1
48
12
1.2
μs
SW OUTPUT
On Resistance
RT = 100 kΩ (Note 1)
RT = 100 kΩ (Note 1)
RT = 10 kΩ (Note 1)
RON
—
0.8
—
Ω
IC
0.75
—
—
A
Short-Circuit Hiccup Time
Minimum On-Time (Short-Circuit)
TOFF TIMER
Continuous Current
Conditions
VDD = 5V
VDD = 4.75V,
VRSENSE = 370 mV,
VSW = 10V (Note 1)
OVERTEMPERATURE PROTECTION
Thermal Shutdown Temperature
TSD
125
145
—
°C
Note 2
Thermal Shutdown Hysteresis
ΔTSD
—
20
—
°C
Note 2
Note 1: Denotes specifications which apply over the full operating ambient temperature range of
–40°C < TA < +125°C
2: For design guidance only
TEMPERATURE SPECIFICATIONS
Parameter
Sym.
Min.
Typ.
Max.
Unit
Operating Ambient Temperature
TA
–40
—
+125
°C
Maximum Junction Temperature
TJ(ABSMAX)
—
—
+150
°C
Ts
–65
—
+150
°C
8-lead MSOP
JA
—
216
—
°C/W
8-lead DFN
JA
—
60
—
°C/W
Conditions
TEMPERATURE RANGE
Storage Temperature
PACKAGE THERMAL RESISTANCE
2020 Microchip Technology Inc.
DS20005734A-page 5
HV9967B
2.0
PIN DESCRIPTION
Table 2-1 shows the pin description details of
HV9967B. Refer to Package Types for the location of
pins.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
SW
2
RSENSE
3
4
5
6
7
PGND
PWMD
NC
RT
AGND
8
VDD
DS20005734A-page 6
Description
Drain of 60V 0.8Ω NDMOS switch and input of H/V regulator
Source of NDMOS switch and current sense input. Connect a resistor between
RSENSE and GND to program the output current and short-circuit protection tripping current.
Power ground. Must be wired to AGND on PCB.
PWM dimming input. This TTL input enables switching of SW when in High state.
No connection
Resistor connected between RT and VDD. This programs the off time of SW.
Analog ground (0V)
Power supply for all internal circuits. Bypass with a low ESR capacitor to PGND
(>0.5 μF). Connect gate of external Depletion-mode NFET for high-voltage operation.
2020 Microchip Technology Inc.
HV9967B
3.0
APPLICATION INFORMATION
3.1
General Description
The HV9967B employs a control scheme that achieves
fast and extremely accurate control of the average
current in the buck inductor by sensing only the switch
current. 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
the HV9910B. The inductor current ripple amplitude
does not affect this control scheme significantly.
Therefore, the LED current is independent of the
variation in inductance, switching frequency and output
voltage. Constant off-time control of the buck converter
is used for stability and to reduce input voltage
regulation of the LED current.
3.2
Off Timer
The duty cycle range of the current control feedback is
limited 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.
Reducing the output LED voltage VO below
VO(MIN)
=
VIN
x
DMIN,
where
DMIN = 0.8 µs/(TOFF + 8 µs), may also result in loss of
LED current regulation. This condition, however,
causes an increase in the LED current and can
potentially trip the short-circuit protection comparator
threshold.
The short-circuit protection comparator trips when the
voltage at RSENSE exceeds 0.4V. When this occurs,
the SW off time THICCUP = 800 µs is generated to
prevent the staircasing of the inductor current and,
potentially, its saturation due to insufficient output
voltage. The typical short-circuit inductor current is
shown in the waveform in Figure 3-1.
The timing resistor connected to RT pin determines the
off time of the gate driver and SW. The timing resistor
must be wired across RT pin and VDD pin. Refer to
Equation 3-1 for the computation of the SW off time.
0.44V/RSENSE
800μs
EQUATION 3-1:
T OFF = R T 100pF
Within the range of 10 kΩ ≤ RT ≤ 400 kΩ
3.3
Average Current Control
Feedback and Output
Short-Circuit Protection
The constant-current control feedback derives the
average-current signal from the source current of the
switching MOSFET. This current is detected with a
sense resistor at the RSENSE pin. The feedback
operates in a fast Open-loop mode. No compensation
is required. Output current is programmed as seen in
Equation 3-2:
EQUATION 3-2:
0.25V
I LED = -------------R CS
The above equation is only valid for continuous
conduction of the output inductor. It is a good practice
to design the inductor such that the peak-to-peak
switching inductor ripple current in it is 30% to 40% of
its average full DC current load. Hence, the
recommended inductance can be computed as
specified in Equation 3-3:
EQUATION 3-3:
V O MAX T OFF
L O = ----------------------------------------0.4 I O
2020 Microchip Technology Inc.
FIGURE 3-1:
Current.
Short-Circuit Inductor
A leading-edge blanking delay is provided at RSENSE
pin to prevent false triggering of the short-circuit hiccup
threshold voltage and the short-circuit protection.
3.4
SW Input and Linear Regulator
The HV9967B includes an integrated 60V, 0.8Ω
switching MOSFET at the SW input. The power for the
IC is supplied from a built-in linear 5V regulator that is
also derived from the SW input.
3.5
PWM Dimming
The HV9967B features a TTL-compatible dimming
input PWMD. Applying a square-wave voltage to
PWMD will modulate the duty ratio of the LED current
accordingly. The rising and falling edges are limited by
the current slew rate in the inductor. The first switching
cycle is terminated upon reaching the 250 mV level at
RSENSE pin. The circuit will reach the Steady state
within three to four switching cycles regardless of the
switching frequency.
3.6
Overtemperature Protection
The HV9967B includes overtemperature protection.
Typically, when the junction temperature exceeds
145°C, switching of the SW input is disabled. The
switching resumes when the temperature falls by
approximately 20°C from the trip point.
DS20005734A-page 7
HV9967B
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
8-lead MSOP
XXXXXX
YWWNNN
8-lead DFN
XXXX
YYWW
NNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
DS20005734A-page 8
Example
H9967B
023874
Example
9967
2032
564
Product Code or Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for product code or customer-specific information. Package may or
not include the corporate logo.
2020 Microchip Technology Inc.
HV9967B
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
2020 Microchip Technology Inc.
DS20005734A-page 9
HV9967B
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
DS20005734A-page 10
2020 Microchip Technology Inc.
HV9967B
APPENDIX A:
REVISION HISTORY
Revision A (February 2020)
• Converted Supertex Doc# DSFP-HV9967B to
Microchip DS20005734A
• Updated the package marking format
• Updated the packaging quantity of the 8-lead DFN
K7 package from 3000/Reel to 3300/Reel to align
it with the actual BQM
• Made minor text changes throughout the document
2020 Microchip Technology Inc.
DS20005734A-page 11
HV9967B
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
XX
PART NO.
-
Package
Options
Device
X
-
Environmental
X
Media Type
Device:
HV9967B
=
Integrated LED Driver with Average-Mode
Current Control
Packages:
MG
=
8-lead MSOP
K7
=
8-lead WDFN
Environmental:
G
=
Lead (Pb)-free/RoHS-compliant Package
Media Type:
(blank)
=
2500/Reel for an MG Package,
Examples:
a) HV9967BMG-G:
Integrated LED Driver with
Average-Mode Current Control,
8-lead MSOP, 2500/Reel
b) HV9967BK7-G:
Integrated LED Driver with Average-Mode
Current
Control,
8-lead WDFN, 3300/Reel
3300/Reel for a K7 Package
DS20005734A-page 12
2020 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
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2020 Microchip Technology Inc.
ISBN:978-1-5224-5677-3
DS20005734A-page 13
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DS20005734A-page 14
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05/14/19
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