HV9861A
LED Driver with Average-Mode Constant Current Control
Features
Description
•
•
•
•
•
•
HV9861A is a patented, average-mode, constant-current control, LED driver IC operating in a constant offtime mode. Unlike the HV9910B, this control IC does
not produce a peak-to-average error, which therefore
greatly improves the accuracy, line and load regulation
of the LED current without any need for loop compensation or high-side current sensing. The output LED
current accuracy is ±3%.
Fast average current control
Programmable constant off-time switching
PWM / linear dimming input
Output short circuit protection with skip mode
Ambient operating temperature -40°C to +125°C
Pin-compatible with the HV9910B and HV9961
Applications
•
•
•
•
•
•
DC/DC or AC/DC LED driver applications
LED back-light driver for LCD displays
General purpose constant current source
LED signage and displays
Architectural and decorative LED lighting
LED street lighting
The IC is equipped with a current limit comparator for
hiccup-mode output short circuit protection. Internal
over-temperature protection is provided. The internally
regulated voltage (VDD) for the HV9861A is 7.5V.
The IC can be powered from a 15 - 450V supply. A
PWM dimming input is provided that accepts an external control TTL-compatible signal. The output current
can be programmed by an internal 270mV reference,
or controlled externally through a 0 - 1.5V dimming
input.
HV9861A is pin-to-pin compatible with the HV9910B
and HV9961, and can be used as a drop-in replacement for many applications to improve the LED current
accuracy and regulation.
2014 Microchip Technology Inc.
DS20005333A-page 1
HV9861A
Package Types
VIN 1
8 RT
CS 2
7 LD
VIN 1
16 NC
NC 2
15 NC
NC 3
14 RT
CS 4
13 LD
GND 5
6 VDD
GND 3
5 PWMD
GATE 4
12 VDD
NC 6
11 NC
NC 7
10 NC
GATE 8
8-Lead SOIC
9
PWMD
16-Lead SOIC
See Table 2-1 for pin information
Typical Application Circuit
15VDC to
450VDC
LED
Load
VIN
PWMD
GATE
HV9861A
VDD
CS
LD
RT
RT
GND
DS20005333A-page 2
RCS
Sets
LED
Current
2014 Microchip Technology Inc.
HV9861A
1.0
ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
VIN to GND...................................................... -0.5V to +470V
VDD to GND.......................................................................12V
LD, PWMD, GATE to GND................. ....-0.3V to (VDD + 0.3V)
CS, RT to GND .............................................. ....-0.3V to 5.0V
Operating temperature ..................................-40°C to +125°C
Storage temperature .....................................-65°C to +150°C
Continuous power dissipation (TA = +25°C)
8-lead SOIC ...............................................650 mW
16-lead SOIC ...........................................1000 mW
Note: 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 listings of this specification, is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
1.1
ELECTRICAL SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (SHEET 1 OF 2)1
TABLE 1-1:
Symbol
Parameter
Note
Min
Typ
Max
Units Conditions
Input
VINDC
Input DC supply voltage
range2
3
15
-
450
V
IINSD
Shut-down mode supply
current
3
-
0.5
1.1
mA
Internally regulated voltage
-
7.25
7.50
8.20
V
500pF at GATE; RT = 226kΩ
Line regulation of VDD
-
-
-
1
V
VIN = 15 - 450V,
500pF at GATE; RT = 226kΩ
-
-
-
100
mV
IDD(ext) = 0 - 1mA,
500pF at GATE; RT = 226kΩ
DC input voltage
Pin PWMD to GND
Internal Regulator
VDD
∆VDD, line
∆VDD, load Load regulation of VDD
UVLO
VDD under-voltage lockout
threshold
3
6.45
-
-
V
VIN rising
∆UVLO
VDD under-voltage lockout
hysteresis
-
-
500
-
mV
VIN falling
VDD voltage margin
3
500
-
-
mV
∆VDD(UV) = VDD - UVLO
Maximum input current
(limited by UVLO)
4
3.5
-
-
4
1.5
-
-
PWMD input low voltage
3
-
-
0.8
V
VIN = 15 - 450V
PWMD input high voltage
3
2.2
-
-
V
VIN = 15 - 450V
Internal pull-down current at
PWMD
-
8.5
-
13.5
μA
VPWMD = 0.8V
∆VDD(UV)
IIN,MAX
mA
VIN = 15V, TA = 25°C
VIN = 15V, TA = 125°C
PWM Dimming
VEN(lo)
VEN(hi)
IEN
2014 Microchip Technology Inc.
DS20005333A-page 3
HV9861A
TABLE 1-1:
Symbol
ELECTRICAL CHARACTERISTICS (CONTINUED) (SHEET 2 OF 2)1
Parameter
Note
Min
Typ
Max
Units Conditions
Current sense reference
voltage
-
262
-
280
mV
AV(LD)
LD-to-CS voltage ratio
-
0.175
-
0.182
-
AV •
LD-to-CS voltage offset
-
-10
-
10
mV
∆VCS(TEMP)
CS threshold temp regulation
4
-
-
5
mV
VLD(OFF)
LD input voltage, shutdown
-
-
150
-
mV
VLD falling
VLD rising
Average Current Sense Logic
VCS
VLD(OFFSET)
Offset = VCS - (AV(LD) • VLD);
VLD = 1.2V
∆VLD(OFF)
LD input voltage, enable
-
-
200
-
mV
TBLANK
Current sense blanking
interval
3
140
-
290
ns
TON(min)
Minimum on-time
-
-
-
760
ns
CS = VCS + 30mV
Maximum steady-state duty
cycle
3
80
-
-
%
Reduction in output LED current may occur beyond this
duty cycle
DMAX
Short Circuit Protection
VCS
Hiccup threshold voltage
3
410
-
510
mV
TDELAY
Current limit delay CS-toGATE
-
-
-
150
ns
THICCUP
Short circuit hiccup time
-
400
-
850
μs
TON(min)
Minimum on-time (short circuit)
-
-
-
430
ns
-
32
40
48
-
8
10
12
-
0.165
-
-
CS = VCS + 30mV
CS = 4V
TOFF Timer
TOFF
Off-time
μs
RT = 1MΩ
RT = 226kΩ
GATE Driver
ISOURCE
Sourcing current
A
VGATE = 0V, VDD = 7.5V
ISINK
Sinking current
-
0.165
-
-
A
VGATE = VDD, VDD = 7.5V
tRISE
Output rise time
-
-
30
50
ns
CGATE = 500pF, VDD = 7.5V
tFALL
Output fall time
-
-
30
50
ns
CGATE = 500pF, VDD = 7.5V
Shut-down temperature
4
128
140
-
°C
---
Hysteresis
4
-
20
-
°C
---
Over-Temperature Protection
TSD
∆TSD
1
2
3
4
Specifications are TA = 25°C, VIN = 15V, VLD = VDD, PWMD = VDD unless otherwise noted.
Also limited by package-power dissipation limit; Whichever is lower.
Applies over the full operating ambient temperature range of -40°C < TA < +125°C.
For design guidance only
TABLE 1-2:
THERMAL RESISTANCE
DS20005333A-page 4
Package
θja
8-Lead SOIC
101°C/W
16-Lead SOIC
83°C/W
2014 Microchip Technology Inc.
HV9861A
2.0
PIN DESCRIPTION
The locations of the pins are listed in Package Types.
TABLE 2-1:
PIN DESCRIPTION
Pin #
Function
Description
8-Lead SOIC
16-Lead SOIC
1
1
VIN
Input of a 15 - 450V linear regulator.
2
4
CS
Current sense pin used to sense the FET current by means of an
external sense resistor.
3
5
GND
Ground return for all internal circuitry. This pin must be electrically
connected to the ground of the power train.
4
8
GATE
Output GATE driver for an external N-channel power MOSFET.
5
9
PWMD
PWM-dimming input of the IC. When this pin is pulled to GND, the
gate driver is turned off. When the pin is pulled high, the gate driver
operates normally.
6
12
VDD
Power supply pin for all internal circuits. It must be bypassed with a
low ESR capacitor to GND (at least 0.1μF).
7
13
LD
Linear-dimming input. Sets the current sense threshold as long as
the voltage at this pin is less than 1.5V. If voltage at LD falls below
150mV, the GATE output is disabled. The GATE signal recovers at
200mV at LD.
8
14
RT
A resistor connected between this pin and GND programs the
GATE off-time.
-
2, 3, 6, 7, 10,
11, 15, 16
NC
2014 Microchip Technology Inc.
No connection.
DS20005333A-page 5
HV9861A
3.0
APPLICATION INFORMATION
Peak-current control (as in the HV9910B) of a buck
converter is the most economical and simple way to
regulate its output current. However, this method suffers accuracy and regulation problems that arise from
the so-called peak-to-average current error, contributed to by the current ripple in the output inductor and
the propagation delay in the current-sense comparator.
The full inductor-current signal is unavailable for direct
sensing at the ground potential in a buck converter
when the control switch is referenced to the same
ground potential. While it is very simple to detect the
peak current in the switch, controlling the average
inductor current is usually implemented by level translating the sense signal from the positive supply rail.
Though this is practical for relatively low input voltage,
this type of average-current control may become
excessively complex and expensive in off line AC or
other high-voltage DC applications.
HV9861A employs a patented 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 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, or output voltage. Constant off-time control of the buck converter is used for stability and to improve the LEDcurrent regulation over a wide range of input voltages.
(Note that, unlike the HV9910B, this IC does not support the constant-frequency mode of operation.)
3.1
OFF Timer
The timing resistor connected to RT determines the offtime of the gate driver, and it must be wired to GND.
Wiring this resistor to GATE as with the HV9910B is no
longer supported. The equation governing the off-time
of the GATE output is given by:
CS pin. The feedback operates in a fast open-loop
mode. No compensation is required. Output current is
programmed simply as:
I LED = 0.27V
---------------R CS
When the voltage at the LD input VLD ≥ 1.5V. Otherwise:
V LD 0.18
I LED = ------------------------R CS
The above equations are only valid for continuous conduction of the output inductor. It is a good practice to
design the inductor such that the switching ripple current in it is 30~40% of its average peak-to-peak, full
load, DC current. Hence, the recommended inductance
can be calculated as:
V O MAX T OFF
L = -----------------------------------0.4 I O
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 HV9861A LED
driver.
Reducing the output LED voltage VO below VO(MIN) =
VIN • DMIN, where DMIN = 760ns/(TOFF +760ns), may
also result in the loss of regulation of the LED current.
However, this condition causes an increase in the LED
current and can potentially trip the short-circuit protection comparator.
A typical output characteristic of the HV9861A LED
driver is shown in Figure 3-1. The corresponding
HV9910B characteristic is given for comparison.
FIGURE 3-1:
R T k
- + 0.3
T OFF s = ------------------25
3.2
Average Current Control
Feedback and Output Short
Circuit Protection
Output Characteristics
0.60
0.55
LED Current (A)
Within the range of 30kΩ ≤ RT ≤ 1.0MΩ.
TYPICAL OUTPUT
CHARACTERISTIC OF AN
HV9861A LED DRIVER
VIN = 170VDC
0.50
0.45
0.40
HV9861A
0.35
0.30
The current through the switching MOSFET source is
averaged and used to give constant-current feedback.
This current is detected using a sense resistor at the
DS20005333A-page 6
HV9910B
0.25
0
10
20
30
40
50
60
Output Voltage (V)
2014 Microchip Technology Inc.
HV9861A
The short circuit protection comparator trips when the
voltage at CS exceeds 0.45V. When this occurs, the
GATE off-time THICCUP = 650µs is generated to prevent
stair-casing of the inductor current, and potentially its
saturation, due to insufficient output voltage. The typical short-circuit current is shown in the waveform of
Figure 3-2.
FIGURE 3-2:
SHORT-CIRCUIT
INDUCTOR CURRENT
0.45V/RCS
650μs
A leading-edge blanking delay is provided at CS to prevent false triggering of the current feedback and the
short circuit protection.
3.3
3.4
HV9861A can be powered directly from a 15 – 450VDC
supply through its VIN input. When this voltage is
applied at the VIN pin, the HV9861A maintains a constant 7.5V level at VDD. This voltage can be used to
power the IC and external circuitry connected to VDD
within the rated maximum current or within the thermal
ratings of the package, whichever limit is lower. The
VDD pin must be bypassed by a low ESR capacitor to
provide a low impedance path for the high frequency
current of the GATE output. The HV9861A can also be
powered through the VDD pin directly with a voltage
greater than the internally regulated 7.5V, but less than
12V.
Despite the instantaneous voltage rating of 450V, continuous voltage at VIN is limited by the power dissipation in the package. For example, when these ICs draw
IIN = 3.0mA from the VIN input, and the 8-lead SOIC
package is used, the maximum continuous voltage at
VIN is limited to the following:
Linear Dimming
When the voltage at LD falls below 1.5V, the internal
270mV reference to the constant-current feedback
becomes overridden by VLD • 0.18. As long as the current in the inductor remains continuous, the LED current is given by the equation in Section 3.2. However,
when VLD falls below 150mV, the GATE output
becomes disabled. The GATE signal recovers, when
VLD exceeds 200mV. This is required in some applications to be able to shut the LED lamp off with the same
signal input that controls the brightness. The typical linear dimming response is shown in Figure 3-3.
FIGURE 3-3:
TYPICAL LINEAR DIMMING
RESPONSE OF AN
HV9861A LED DRIVER
Input Voltage Regulator
T J MAX – T A
- = 330V
V IN MAX = -----------------------------R J – A I IN
In this instance, the ambient temperature TA = 25°C, the
maximum working junction temperature TJ(MAX) = 125°C,
and the junction-to-ambient thermal resistance Rθ,JA =
101°C/W.
In such cases, when it is needed to operate the
HV9861A from a higher voltage, a resistor or a Zener
diode can be added in series with the VIN input to divert
some of the power loss from the IC. In the above example, using a 100V Zener diode will allow the circuit to
work up to 430V. The input current drawn from the VIN
pin is represented by the following equation:
I IN 1.0mA + Q G f s
LD Response Characteristics
0.40
0.35
In the above equation, fS is the switching frequency,
and QG is the GATE charge of the external FET
obtained from the manufacturer’s data sheet.
LED Current (A)
0.30
0.25
0.20
3.5
0.15
0.10
0.05
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
LD (V)
GATE Output
The GATE output of HV9861A is used to drive an external MOSFET. The gate charge, QG, of the external
MOSFET should be less than 25nC for switching frequencies ≤100kHz and less than 15nC for switching
frequencies >100kHz.
The linear dimming input could also be used for “mixedmode” dimming to expand the dimming ratio. In such
case a pulse-width modulated signal of a measured
amplitude below 1.5V should be applied at LD.
2014 Microchip Technology Inc.
DS20005333A-page 7
HV9861A
3.6
PWM Dimming
The rising and falling edges are limited by the current
slew rate in the inductor. The first switching cycle is terminated upon reaching the 270mV (VLD • 0.18) level at
CS. The circuit is further reaching its steady-state
within 3–4 switching cycles regardless of the switching
frequency.
Due to the fast open-loop response of the averagemode, current-control loop of the HV9861A, the PWM
dimming performance nearly matches that of the
HV9910B. The inductor current waveform comparison
is shown in Figure 3-4.
FIGURE 3-4:
TYPICAL PWM DIMMING
RESPONSE OF AN
HV9861A LED DRIVER
CH2 (red): PWMD
CH4 (green): Inductor Current
CH3 (blue): Same as HV9910B, for comparison
FIGURE 3-5:
FUNCTIONAL BLOCK DIAGRAM
Regulator
VIN
VDD
+
-
UVLO
POR
0.15/0.20V
LD
+
-
min (VLD • 0.18, 0.27V)
GATE
Auto-REF
CS
Average Current
Control Logic
Latch
Enable
Blanking
IN
OUT
PWMD
GND
0.45V
+
-
11μA
R Q
S Q
CLK
HV9861A
DS20005333A-page 8
650μs
TOFF
Timer
i
Current
Mirror
RT
2014 Microchip Technology Inc.
HV9861A
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
8-lead SOIC
XXXXXXXX
XX e3 YYWW
NNN
16-lead SOIC
XXXXXXXXXXX
XXXXXXXXX e3
YYWWNNN
Legend: XX...X
Y
YY
WW
NNN
*
Note:
Example
HV9861A
LG e3 1447
343
Example
HV9861ANG e3
1447343
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 (
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.
2014 Microchip Technology Inc.
DS20005333A-page 9
HV9861A
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
DS20005333A-page 10
2014 Microchip Technology Inc.
HV9861A
16-Lead SOIC (Narrow Body) Package Outline (NG)
9.90x3.90mm body, 1.75mm height (max), 1.27mm pitch
D
16
θ1
E1 E
Note 1
(Index Area
D/2 x E1/2)
L2
1
L
Top View
View B
View
B
A
h
A A2
h
Seating
Plane
e
A1
Seating
Plane
θ
L1
Gauge
Plane
Note 1
b
Side View
View A-A
A
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
Note:
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DPROGHGPDUNLGHQWL¿HUDQHPEHGGHGPHWDOPDUNHURUDSULQWHGLQGLFDWRU
Symbol
MIN
Dimension
(mm)
A
A1
A2
b
D
1.35*
0.10
1.25
0.31
9.80*
NOM
-
-
-
-
MAX
1.75
0.25
1.65*
0.51
9.90
E
E1
e
5.80* 3.80*
6.00
3.90
10.00* 6.20* 4.00*
1.27
BSC
h
L
0.25
0.40
-
-
0.50
1.27
L1
L2
1.04 0.25
REF BSC
ș
ș
0O
5O
-
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8O
15O
JEDEC Registration MS-012, Variation AC, Issue E, Sept. 2005.
7KLVGLPHQVLRQLVQRWVSHFL¿HGLQWKH-('(&GUDZLQJ
Drawings are not to scale.
2014 Microchip Technology Inc.
DS20005333A-page 11
HV9861A
APPENDIX A:
REVISION HISTORY
Revision A (December 2014)
• Original Release of this Document.
DS20005333A-page 12
2014 Microchip Technology Inc.
HV9861A
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
Device:
Package:
-
XX
X
-
Package Environmental
Options
X
Media
Type
Examples:
a)
HV9861ALG-G:
8-lead SOIC package,
2500/Reel.
b)
HV9861ANG-G
16-lead SOIC package,
45/Tube
HV9861A= LED Driver with Average-Mode Constant
Current Control
LG
= 8-lead SOIC
NG
= 16-lead SOIC
Environmental
G
= Lead (Pb)-free/ROHS-compliant package
Media Type:
(blank)
= Reel for LG package, Tube for NG package
2014 Microchip Technology Inc.
DS20005333A-page 13
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
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
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MICROCHIP MAKES NO REPRESENTATIONS OR
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© 2014, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
ISBN: 978-1-63276-871-1
QUALITYMANAGEMENTSYSTEM
CERTIFIEDBYDNV
== ISO/TS16949==
DS20005333A-page 14
Microchip received ISO/TS-16949:2009 certification for its worldwide
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Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
2014 Microchip Technology Inc.
Worldwide Sales and Service
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DS20005333A-page 15
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Fax: 63-2-634-9069
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Fax: 34-91-708-08-91
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Fax: 886-2-2508-0102
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Fax: 66-2-694-1350
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Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
03/25/14
2014 Microchip Technology Inc.