HV9803
LED Driver IC with Average-Mode Constant Current Control
Features
General Description
• Fast Average Current Control
• Correction for Propagation Delay and Offset
Voltage
• Fixed Offtime Switching Mode
• Linear Dimming Input
• PWM Dimming Input
• Output Short-Circuit Protection with
Programmable Skip Mode
• Input Undervoltage Shutdown
The HV9803 is an open-loop, Average-mode current
control LED driver IC operating in a constant Offtime
mode. The IC features ±2% current accuracy and tight
line and load regulation of the LED current without any
need for loop compensation or high-side current
sensing. Its auto-zero circuit cancels the effect of both
the input offset voltage and the propagation delay in the
current sense comparator.
The HV9803 can be powered from a 7V to 13.2V
supply. The IC features fast PWM dimming response.
The linear dimming input LD can accept a reference
voltage of up to 2.5V.
Applications
• Backlighting of LCD Panels
• General Lighting
The IC is equipped with a current limit comparator for
Hiccup-mode output short-circuit protection. It also
features a programmable input undervoltage
shutdown.
Package Type
8-lead SOIC
(Top view)
CS
1
8
LD
VDD
2
7
UVLO
GND
3
6
PWMD
GATE
4
5
RT
See Table 2-1 for pin information.
2018 Microchip Technology Inc.
DS20005641A-page 1
HV9803
Functional Block Diagram
i
+
-
IRT(LIM)
VDD
6.2V/6.7V
1.08V/1.23V
Reset
+
-
+
VLD
LD
250mV
Auto-REF
xAV(LD)
POR
6.0mV
CS
L/E
Blanking
IN
SKIP
Average-Mode
Control Logic
GATE
OUT
VLIM
GND
SKIP
PWMD
+
Q
DS20005641A-page 2
R
Q
S
Q
S
R
HV9803
UVLO
Reset
TOFF
Timer
i
Current
Mirror
RT
2018 Microchip Technology Inc.
HV9803
Typical Application Circuit
+VIN
7V-13.2V
CDD
R1
DIM
CIN
D1
L1
VDD
PWMD
Q1
GATE
HV9803
REF
LD
CS
UVLO
RT
RCS
CSKIP
GND
RT
R2
2018 Microchip Technology Inc.
DS20005641A-page 3
HV9803
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
VDD, GATE, CS ........................................................................................................................................ –0.3V to +14V
LD, RT, PWMD, UVLO ............................................................................................................................... –0.3V to +6V
Junction Temperature, TJ .................................................................................................................... –40°C to +150°C
Storage Temperature, TS ..................................................................................................................... –65°C to +150°C
Power Dissipation (at 25 °C):
8-lead SOIC ............................................................................................................................................ 650 mW
† 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.
DC ELECTRICAL CHARACTERISTICS
Electrical Specifications: Specifications apply over the full operating ambient temperature range, TA = –40°C to
+125°C. Unless otherwise noted, TA = 25°C, VDD = 12V and VPWMD = 5V.
Parameter
Sym.
Min.
Typ.
Max
Unit
Conditions
Input DC Supply Voltage Range
VDD
—
—
13.2
V
Quiescent VDD Supply Current
IDD
—
1.5
2.5
mA
VDD Undervoltage Lockout Upper
Threshold
VDDUV,R
6.45
6.7
6.95
V
VDD Rising
VDD Undervoltage Lockout Hysteresis
∆VDDUV
—
500
—
mV
VDD Falling
PWMD Input Low Voltage
VPWMD(LO)
—
—
1
V
PWMD Input High Voltage
VPWMD(HI)
2.6
—
—
V
RPWMD
50
100
150
kΩ
External Reference Voltage
VLD
0
—
3
V
CS Threshold Voltage
VCST
LD to CS Voltage Ratio
INPUT
DC input voltage
VCS = 0V
VDD UNDERVOLTAGE LOCKOUT
PWM DIMMING
Internal Pull-Down Resistance at
PWMD
CURRENT SENSE COMPARATOR
762
778
794
955
975
995
AV(LD)
—
0.49
—
—
Current Sense Blanking Interval
TBLANK
150
—
280
ns
Minimum On-Time
TON(MIN)
—
—
760
ns
VCS = 0.5 VLD + 30 mV
Reduction in output LED
current may occur beyond this
duty cycle.
mV
DMAX
80
—
—
%
Current Limit Threshold Voltage
VLIM
1.57
1.75
1.93
V
Current Limit Delay CS-to-GATE
TDELAY
—
—
150
ns
UVLO Skip Timer Reset Switch
Resistance
RUVRST
—
—
500
Ω
Maximum Steady State Duty Cycle
VLD = 1.6V
VLD = 2V
SHORT-CIRCUIT PROTECTION
DS20005641A-page 4
VCS = VLIM + 30 mV
2018 Microchip Technology Inc.
HV9803
DC ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Specifications apply over the full operating ambient temperature range, TA = –40°C to
+125°C. Unless otherwise noted, TA = 25°C, VDD = 12V and VPWMD = 5V.
Parameter
Sym.
Min.
Typ.
Max
Unit
Conditions
UVLO Skip Timer Reset Voltage
VUVRST
200
—
300
mV
Minimum On-Time
(Short Circuit)
TON(MIN)
—
—
430
ns
VCS = VLIM + 30 mV
6.7
9
11.3
μs
RT = 250 kΩ
0.8
1
1.2
μs
RT = 25 kΩ
IRT(LIM)
—
2.8
—
mA
ISOURCE
0.165
—
—
A
VGATE = 0V
Gate Sinking Current
ISINK
0.165
—
—
A
VGATE = VDD
GATE Output Rise Time
tRISE
—
30
50
ns
CGATE = 500 pF
GATE Output Fall Time
tFALL
—
30
50
ns
CGATE = 500 pF
Undervoltage Upper Threshold Voltage
VUVLO,R
1.17
1.23
1.29
V
VUVLO rising
Undervoltage Threshold Voltage
Hysteresis
∆VUVLO
—
150
—
mV
VUVLO falling
Sym.
Min.
Typ.
Max.
Unit
TOFF TIMER
Offtime
TOFF
RT Overcurrent Threshold
GATE DRIVER
Gate Sourcing Current
UVLO
TEMPERATURE SPECIFICATIONS
Parameter
Conditions
TEMPERATURE RANGE
Operating Ambient Temperature
TA
–40
—
+125
°C
Maximum Junction Temperature
TJ
—
—
+150
°C
Storage Temperature
TS
–65
—
+150
°C
JA
—
101
—
°C/W
PACKAGE THERMAL RESISTANCE
8-lead SOIC
2018 Microchip Technology Inc.
DS20005641A-page 5
HV9803
2.0
PIN DESCRIPTION
The details on the pins of HV9803 are listed in
Table 2-1. See location of pins in Package Type.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
CS
2
VDD
This is the power supply input for the GATE output and input of the low-voltage regulator powering the internal logic. It must be bypassed with a low-ESR capacitor to
GND (at least 0.1 μF).
3
GND
Ground return for all internal circuitry. This pin must be electrically connected to the
ground of the power train.
4
GATE
This pin is the output of gate driver for an external N-channel power MOSFET.
5
RT
6
PWMD
This is the 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.
7
UVLO
This pin is the undervoltage comparator input. It is also used to program a
short-circuit protection skip delay.
8
LD
DS20005641A-page 6
Description
This pin is the current sense pin used to detect the MOSFET source current by
means of an external sense resistor.
A resistor connected between RT and GND programs the GATE offtime.
This pin is the reference voltage input for programming the LED current.
2018 Microchip Technology Inc.
HV9803
3.0
FUNCTIONAL DESCRIPTION
3.1
General
The peak-current control of a buck converter is the
most economical and simplest way to regulate its
output current. However, it suffers accuracy and
regulation
problems
that
arise
from
the
peak-to-average current error due to the current ripple
in the output inductor and the propagation delay in the
current sense comparator. The full inductor current
signal is unavailable for switch current sensing with
current-sensing resistor in the ground path between the
low-side switch and ground in a buck converter with
low-side main switch configuration when the switch is
turned-on. 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
current sense signal from the positive input supply rail.
While this is practical for relatively low-input voltage,
this type of average-current control may become
excessively complex and expensive in the case of input
voltages above 100V.
The HV9803 uses a control scheme that senses only
the switch current to quickly and accurately control the
average current in the buck inductor. No compensation
of the current control loop is required. The inductor
current ripple amplitude does not affect this control
scheme significantly. The LED current is independent
of the variation in inductance, switching frequency and
output voltage. Constant offtime control of the buck
converter is used for stability and to improve the LED
current regulation over a wide range of input voltages.
The IC features excellent PWM dimming response.
3.2
OFF Timer
In the HV9803, the timing resistor connected at the RT
pin determines the offtime of the gate driver, and the
resistor must be wired to GND. The equation governing
the offtime of the GATE output is derived with
Equation 3-1.
EQUATION 3-1:
EQUATION 3-2:
1
T 2 n = --- T 1 n + T 1 n – 1
2
Where T1,n and T1,n-1 are the times to the CS
threshold in any two consecutive switching cycles.
This iterative control law is needed for damping
sub-harmonic oscillation. Note that the control law is
only valid up to a maximum switching duty cycle,
DMAX = 0.8. Exceeding DMAX will cause a reduction in
the LED current.
Propagation delay in the current sense comparator is
one of the most significant contributors to the LED
current error. It must be noted that the control scheme
described above does not improve this deficiency of
the peak-current control scheme by itself. Moreover, it
samples the propagation delay during T1 and replicates
it during T2, essentially doubling the error introduced by
this delay. To eliminate this error, the reference voltage
is corrected by an auto-zero circuit. In essence, the
HV9803 samples its CS signal when the current sense
comparator triggers and detects the difference
between the sampled CS level and the reference input
of the current sense comparator. The resulting
difference is subtracted from the reference level to
generate a new reference in the next switching cycle.
3.4
GATE Output
The GATE output of the HV9803 is used to drive an
external MOSFET. It is recommended that the gate
charge QG of the external MOSFET should be less
than 25 nC for switching frequencies ≤100 kHz and
less than 15 nC for switching frequencies >100 kHz.
The resulting LED current is calculated using
Equation 3-3.
EQUATION 3-3:
0.49 V LD – 6mV
I LED = -------------------------------------------R CS
T OFF = R T 40pF
The RT input is protected from short circuit.
Overcurrent condition at RT inhibits the IC.
3.3
Current Sense Comparator and
Timer Circuits
The function of the HV9803’s current sense
comparator is similar to that of a peak current
controller. However, the GATE pulse is not terminated
immediately as the CS threshold is met. The GATE
turn-off in the nth cycle is delayed by a time T2,n
determined by a timer circuit as shown in Equation 3-2.
2018 Microchip Technology Inc.
DS20005641A-page 7
HV9803
3.5
Short-Circuit Protection
The HV9803 is equipped with a short-circuit protection
comparator having another CS threshold VLIM. When
this second threshold is triggered, the GATE output
shuts off for the duration of a restart delay, determined
by the RC constant set at UVLO pin. Meanwhile, the
capacitor CSKIP is discharged below 200 mV. The
restart delay due to charging CSKIP to the UVLO upper
threshold is calculated as shown in Equation 3-4.
EQUATION 3-4:
k V IN – 0.30V
T SKIP = k R 1 C SKIP In --------------------------------------
k V IN – 1.17V
Where:
3.6
Undervoltage Shutdown
Undervoltage comparator input is provided to disable
the IC when the UVLO input is below the UVLO lower
threshold. Hysteresis is provided to avoid oscillation.
3.7
Failure Modes and Effects
Analysis (FMEA)
The HV9803 is designed to withstand short circuit
between its adjacent pins without damage. Table 3-1
describes the effect of such incidental short-circuit
conditions.
R2
k = -----------------R1 + R2
TABLE 3-1:
SHORT-CIRCUIT MODES AND EFFECTS
Short-Circuit Mode
Effect
CS to VDD
The IC triggers the short-circuit protection and operates in the Auto-restart mode continuously.
VDD to GND
Short circuit across the 12V should cause the external bias supply overcurrent protection.
GND to GATE
This should cause the external bias supply overcurrent protection. The power MOSFET Q1 is
off.
Case 1–PWMD = Lo: The RT pin sources its maximum current.
GATE = 0V and Q1 is off.
RT to PWMD
Case 2–PWMD = Hi: The RT pin is pulled up, shutting off the timer.
GATE is off.
PWMD to UVLO
This overdrives the undervoltage threshold. However, since the VIN UV condition is harmless
to the IC, there is no effect.
UVLO to LD
LD overdrives the UVLO. If LD is lower than the UVLO lower threshold, the IC shuts off. No
effect otherwise.
DS20005641A-page 8
2018 Microchip Technology Inc.
HV9803
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
8-lead SOIC
Example
XXXXXXXX
e3 YYWW
NNN
HV9803LG
e3 1815
891
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.
2018 Microchip Technology Inc.
DS20005641A-page 9
HV9803
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
DS20005641A-page 10
2018 Microchip Technology Inc.
HV9803
APPENDIX A:
REVISION HISTORY
Revision A (August 2018)
• Converted Supertex Doc# DSFP-HV9803 to
Microchip DS20005641A
• Changed the packaging quantity for the 8-lead
SOIC LG package from 2500/Reel to 3300/Reel
• Added a maximum junction temperature to the
Temperature Specifications Table
• Made minor text changes throughout the document
2018 Microchip Technology Inc.
DS20005641A-page 11
HV9803
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
PART NO.
Device
XX
-
Package
Options
X
-
Environmental
X
Media Type
Device:
HV9803
=
LED Driver IC with Average-Mode Constant
Current Control
Package:
LG
=
8-lead SOIC
Environmental:
G
=
Lead (Pb)-free/RoHS-compliant Package
Media Type:
(blank)
=
3300/Reel for an LG Package
DS20005641A-page 12
Example:
a) HV9803LG-G:
LED Driver IC with Average-Mode
Constant Current Control, 8-lead
SOIC Package, 3300/Reel
2018 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
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
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conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
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SQTP is a service mark of Microchip Technology Incorporated in
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CERTIFIED BY DNV
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© 2018, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-3476-4
== ISO/TS 16949 ==
2018 Microchip Technology Inc.
DS20005641A-page 13
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DS20005641A-page 14
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2018 Microchip Technology Inc.
08/15/18
