HV9803B
LED Driver IC with Average-Mode Constant Current Control
Features
General Description
• Fast Average Current Control
• Correction for Propagation Delay and Offset
Voltage
• Fixed Off-time Switching Mode
• Linear Dimming Input
• PWM Dimming Input
• Output Short-circuit Protection with
Programmable Skip Mode
• Input Undervoltage Shutdown
The HV9803B is an open-loop, Average-mode current
control LED driver IC operating in a constant Off-time
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 HV9803B can be powered from a 7V to 16V
supply. The IC features fast PWM dimming response.
The linear dimming input LD can accept a reference
voltage from 0V to 3V.
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.
2017 Microchip Technology Inc.
DS20005642A-page 1
HV9803B
Functional Block Diagram
i
+
-
IRT(LIM)
VDD
UVLO1
+
-
Reset
VLD
LD
+
250mV
Auto-REF
xAV(LD)
POR
10mV
CS
UVLO2
L/E
Blanking
IN
SKIP
Average-Mode
Control Logic
GATE
OUT
VLIM
GND
SKIP
PWMD
+
Q
DS20005642A-page 2
R
Q
S
Q
S
R
HV9803B
UVLO
Reset
TOFF
Timer
i
Current
Mirror
RT
2017 Microchip Technology Inc.
HV9803B
Typical Application Circuit
+VIN
7.0~16V
CDD
R1
DIM
CIN
D1
L1
VDD
PWMD
Q1
GATE
HV9803B
REF
LD
CS
UVLO
RT
RCS
CSKIP
GND
RT
R2
2017 Microchip Technology Inc.
DS20005642A-page 3
HV9803B
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
VDD, Gate, CS ...........................................................................................................................................–0.3V to +17V
LD, RT, PWMD, UVLO ............................................................................................................................... –0.3V to +6V
Operating Junction Temperature Range, TJ ........................................................................................ –40°C to +125°C
Storage Temperature Range, 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.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = TJ = +25°C, VDD = 12V and PWMD = 5V.
Parameter
Sym.
Min.
Typ.
Max.
Unit
Conditions
Input DC Supply Voltage Range
VDD
—
—
16
V
Quiescent VDD Supply Current
IDD
—
1.5
2.5
mA
VCS = 0V (Note 1)
VDD Undervoltage Lockout Threshold
VDD(UV)
6.45
6.7
6.95
V
VDD rising (Note 1)
VDD Undervoltage Lockout Hysteresis
∆VDD(UV)
—
500
—
mV
INPUT
DC input voltage (Note 1)
VDD UNDERVOLTAGE LOCKOUT
VDD falling
PWM DIMMING
PWMD Input Low Voltage
VEN(LO)
—
—
1
V
Note 1
PWMD Input High Voltage
VEN(HI)
2.6
—
—
V
Note 1
REN
50
100
150
kΩ
V
Internal Pull-down Resistance at PWMD
CURRENT SENSE COMPARATOR
External Reference Voltage
VLD
0
—
3
284
—
296
866
—
902
0.495
—
mV
VLD = 0.6V (Note 1)
CS Reference Voltage
VCS
LD to CS Voltage Ratio
AV(LD)
—
Current Sense Blanking Interval
TBLANK
150
—
280
ns
Note 1
Minimum On-time
TON(MIN)
—
—
760
ns
VCS = 0.5 VLD + 30 mV
DMAX
85
—
—
%
Reduction in output LED
current may occur beyond this
duty cycle. (Note 1)
VLIM
1.57
—
1.93
V
Current Limit Delay CS-to-Gate
TDELAY
—
—
150
ns
UVLO Skip Timer Reset Switch
Resistance
RUVLO(R)
—
—
500
Ω
UVLO Skip Timer Reset Voltage
VUVLO(R)
200
—
300
mV
Minimum On-time
(Short Circuit)
TON(MIN)
—
—
430
ns
Maximum Steady State Duty Cycle
VLD = 1.8V (Note 1)
—
SHORT-CIRCUIT PROTECTION
Internal Current Reference
Note 1:
VCS = VLIM + 30 mV
VCS = VLIM + 30 mV
Applies over the full operating temperature range of –40°C < TA (= TJ) < +125°C
DS20005642A-page 4
2017 Microchip Technology Inc.
HV9803B
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, TA = TJ = +25°C, VDD = 12V and PWMD = 5V.
Parameter
Sym.
Min.
Typ.
Max.
Unit
Conditions
6.7
9
11.3
μs
RT = 250 kΩ
0.8
1
1.2
μs
RT = 25 kΩ
IRT(LIM)
—
2.8
—
mA
TOFF TIMER
Off-time
TOFF
RT Overcurrent Threshold
GATE DRIVER
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 Threshold Voltage
UVLO
1.17
—
1.29
V
VUVLO rising (Note 1)
Undervoltage Threshold Voltage
Hysteresis
∆UVLO
—
150
—
mV
Gate Sourcing Current
UVLO
Note 1:
VUVLO falling
Applies over the full operating temperature range of –40°C < TA (= TJ) < +125°C
TEMPERATURE SPECIFICATIONS
Parameter
Sym.
Min.
Typ.
Max.
Unit
Operating Junction Temperature
TJ
–40
—
+125
°C
Storage Temperature
TS
–65
—
+150
°C
JA
—
101
—
°C/W
Conditions
TEMPERATURE RANGE
PACKAGE THERMAL RESISTANCE
8-lead SOIC
2017 Microchip Technology Inc.
DS20005642A-page 5
HV9803B
2.0
PIN DESCRIPTION
The details on the pins of HV9803B are listed on
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 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 form a short-circuit
protection skip delay.
8
LD
DS20005642A-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 off-time
This pin is the reference voltage input for programming the LED current.
2017 Microchip Technology Inc.
HV9803B
3.0
FUNCTIONAL DESCRIPTION
3.1
General
The peak-current control of a buck converter is an
economical and simple 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 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 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 HV9803B uses a control scheme that achieves
fast and highly accurate control of average current in
the buck inductor by only sensing the switch current.
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
off-time 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 HV9803B, the timing resistor connected at the RT
pin determines the off-time of the gate driver, and the
resistor must be wired to GND. The equation governing
the off-time of the gate output is derived with
Equation 3-1.
EQUATION 3-1:
T OFF = R T 40pF
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 LD
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 = 0.85. 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
HV9803B 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 HV9803B is used to drive an
external MOSFET. It is recommended that the gate
charge QG of the external MOSFET 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:
0.495 V LD – 7mV
I LED = ----------------------------------------------R CS
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 HV9803B’s current sense
comparator is similar to that of a peak-current
controller. However, the gate pulse is not terminated
immediately as the LD 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.
2017 Microchip Technology Inc.
DS20005642A-page 7
HV9803B
3.5
Short-circuit Protection
The HV9803B is equipped with a protection
comparator having a 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 at UVLO. The capacitor CSKIP is discharged
below 200 mV. A restart delay due to charging CSKIP to
the UVLO start threshold is calculated as shown in
Equation 3-4.
EQUATION 3-4:
k VIN – 0.30V
T SKIP = k R 1 C SKIP In --------------------------------------
k VIN – 1.17V
Where:
3.6
Undervoltage Shutdown
Undervoltage comparator input is provided to disable
the IC when the UVLO input is below a threshold.
Hysteresis is provided to avoid oscillation.
3.7
Failure Modes and Effects
Analysis (FMEA)
The HV9803B 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:
FAILURE MODES AND ANALYSIS
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
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 will overdrive 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 threshold, the IC shuts off. No effect
otherwise.
DS20005642A-page 8
2017 Microchip Technology Inc.
HV9803B
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
8-lead SOIC
Example
XXXXXXXX
XX e3 YYWW
NNN
HV9803B
LG e3 1723
491
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
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.
2017 Microchip Technology Inc.
DS20005642A-page 9
HV9803B
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
DS20005642A-page 10
2017 Microchip Technology Inc.
HV9803B
APPENDIX A:
REVISION HISTORY
Revision A (February 2017)
• Converted Supertex Doc# DSFP-HV9803B to
Microchip DS20005642A
• Changed the packaging quantity for the 8-lead
SOIC LG package from 2500/Reel to 3300/Reel
• Made minor text changes throughout the document
2017 Microchip Technology Inc.
DS20005642A-page 11
HV9803B
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.
Device
-
Package
Options
X
-
Environmental
X
Media Type
Device:
HV9803B
=
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
DS20005642A-page 12
Example:
a) HV9803BLG-G: LED Driver IC with Average-Mode
Constant Current Control, 8-lead
SOIC Package, 3300/Reel
2017 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.
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OTHERWISE, RELATED TO THE INFORMATION,
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© 2017, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-1355-4
== ISO/TS 16949 ==
2017 Microchip Technology Inc.
DS20005642A-page 13
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DS20005642A-page 14
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Tel: 886-3-5778-366
Fax: 886-3-5770-955
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Tel: 886-7-213-7830
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
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Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Poland - Warsaw
Tel: 48-22-3325737
Romania - Bucharest
Tel: 40-21-407-87-50
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Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
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Tel: 46-31-704-60-40
Sweden - Stockholm
Tel: 46-8-5090-4654
UK - Wokingham
Tel: 44-118-921-5800
Fax: 44-118-921-5820
2017 Microchip Technology Inc.
11/07/16
