HV9861A
LED Driver with Average-Mode Constant Current Control
Features
• 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
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%.
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 (V
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.
) for the HV9861A is 7.5V.
DD
2014 Microchip Technology Inc. DS20005333A-page 1
HV9861A
8-Lead SOIC
16-Lead SOIC
See Ta bl e 2 -1 for pin information
PWMD
VDD
LD
GATE
CS
RT
VIN
HV9861A
15VDC to
450VDC
Sets
LED
Current
LED
Load
GND
R
CS
R
T
Package Types
1
VIN
2
CS
3
GND
4
GATE
Typical Application Circuit
8
7
6
5
RT
LD
VDD
PWMD
VIN
NC
NC
CS
GND
NC
NC
GATE
16
15
14
13
12
11
10
9
NC
NC
RT
LD
VDD
NC
NC
PWMD
1
2
3
4
5
6
7
8
DS20005333A-page 2 2014 Microchip Technology Inc.
1.0 ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
VIN to GND...................................................... -0.5V to +470V
V
to GND.......................................................................12V
DD
LD, PWMD, GATE to GND.....................-0.3V to (V
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 (T
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.
= +25°C)
A
1.1 ELECTRICAL SPECIFICATIONS
+ 0.3V)
DD
HV9861A
TABLE 1-1: ELECTRICAL CHARACTERISTICS (SHEET 1 OF 2)
1
Symbol Parameter Note Min Typ Max Units Conditions
Input
V
I
INSD
INDC
Input DC supply voltage
2
range
Shut-down mode supply
current
3
15 - 450 V DC input voltage
3
- 0.5 1.1 mA Pin PWMD to GND
Internal Regulator
V
DD
V
DD
, load Load regulation of V
V
DD
UVLO
UVLO
V
DD(UV)VDD
I
IN,MAX
Internally regulated voltage - 7.25 7.50 8.20 V 500pF at GATE; RT = 226k
= 15 - 450V,
V
, line Line regulation of V
V
under-voltage lockout
DD
threshold
under-voltage lockout
V
DD
hysteresis
voltage margin
Maximum input current
(limited by UVLO)
DD
DD
---1V
---100mV
3
6.45 - - V VIN rising
--500-mVV
3
500 - - mV V
4
3.5 - -
4
1.5 - - VIN = 15V, TA = 125°C
mA
IN
500pF at GATE; RT = 226k
I
DD(ext)
500pF at GATE; RT = 226k
falling
IN
DD(UV)
VIN = 15V, TA = 25°C
PWM Dimming
V
V
EN(lo)
EN(hi)
I
EN
PWMD input low voltage
PWMD input high voltage
Internal pull-down current at
PWMD
3
3
-8.5-13.5AV
--0.8VV
IN
2.2 - - V VIN = 15 - 450V
PWMD
= 15 - 450V
= 0 - 1mA,
= VDD - UVLO
= 0.8V
2014 Microchip Technology Inc. DS20005333A-page 3
HV9861A
TABLE 1-1: ELECTRICAL CHARACTERISTICS (CONTINUED) (SHEET 2 OF 2)
Symbol Parameter Note Min Typ Max Units Conditions
Average Current Sense Logic
V
CS
A
V(LD)
A
V
V
LD(OFFSET)
V
CS(TEMP)
V
LD(OFF)
V
LD(OFF)
T
BLANK
T
ON(min)
D
MAX
Short Circuit Protection
V
CS
T
DELAY
T
HICCUP
T
ON(min)
TOFF Timer
T
OFF
GATE Driver
I
SOURCE
I
SINK
t
RISE
t
FALL
Over-Temperature Protection
T
SD
T
1 Specifications are T
2 Also limited by package-power dissipation limit; Whichever is lower.
3 Applies over the full operating ambient temperature range of -40°C < T
4 For design guidance only
Current sense reference
voltage
- 262 - 280 mV
LD-to-CS voltage ratio - 0.175 - 0.182 -
•
LD-to-CS voltage offset - -10 - 10 mV
CS threshold temp regulation
4
--5mV
Offset = V
VLD = 1.2V
LD input voltage, shutdown - - 150 - mV VLD falling
LD input voltage, enable - - 200 - mV VLD rising
Current sense blanking
interval
3
140 - 290 ns
Minimum on-time - - - 760 ns CS = VCS + 30mV
Maximum steady-state duty
cycle
Hiccup threshold voltage
Current limit delay CS-toGATE
3
80 - - %
3
410 - 510 mV
---150nsCS = V
Reduction in output LED current may occur beyond this
duty cycle
Short circuit hiccup time - 400 - 850 s
Minimum on-time (short circuit) - - - 430 ns C S = 4V
Off-time
-324048
- 8 10 12 R
s
R
Sourcing current - 0.165 - - A V
Sinking current - 0.165 - - A V
Output rise time - - 30 50 ns C
Output fall time - - 30 50 ns C
Shut-down temperature
Hysteresis
SD
= 25°C, VIN = 15V, VLD = VDD, PWMD = VDD unless otherwise noted.
A
4
128 140 - °C ---
4
- 20 - °C ---
< +125°C.
A
CS
= 1M
T
= 226k
T
= 0V, VDD = 7.5V
GATE
= VDD, VDD = 7.5V
GATE
= 500pF, VDD = 7.5V
GATE
= 500pF, VDD = 7.5V
GATE
1
- (A
CS
+ 30mV
V(LD)
• VLD);
TABLE 1-2: THERMAL RESISTANCE
Package θja
8-Lead SOIC 101°C/W
16-Lead SOIC 83°C/W
DS20005333A-page 4 2014 Microchip Technology Inc.
2.0 PIN DESCRIPTION
The locations of the pins are listed in Package Types.
TABLE 2-1: PIN DESCRIPTION
Pin #
8-Lead SOIC 16-Lead SOIC
1 1 VIN Input of a 15 - 450V linear regulator.
24CS
35GND
4 8 GATE Output GATE driver for an external N-channel power MOSFET.
59PWMD
612VDD
713LD
814RT
-
2, 3, 6, 7, 10,
11, 15, 16
Function Description
Current sense pin used to sense the FET current by means of an
external sense resistor.
Ground return for all internal circuitry. This pin must be electrically
connected to the ground of the power train.
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.
Power supply pin for all internal circuits. It must be bypassed with a
low ESR capacitor to GND (at least 0.1F).
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.
A resistor connected between this pin and GND programs the
GATE off-time.
NC
No connection.
HV9861A
2014 Microchip Technology Inc. DS20005333A-page 5
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