HV9911
Switch-Mode LED Driver IC with High Current Accuracy
Features
• Switch-mode Controller for Single-switch Drivers:
- Buck
- Boost
- Buck-boost
- SEPIC
• Works with High-side Current Sensing
• Closed-loop Control of Output Current
• High Pulse-Width Modulation (PWM) Dimming
Ratio
• Internal 250V Linear Regulator (can be extended
using external Zener Diodes)
• Internal 2% Voltage Reference (0°C < T
A
< 85°C)
• Constant Frequency or Constant Off-time
Operation
• Programmable Slope Compensation
• Logic Input for Enable and PWM Dimming
• +0.2A/-0.4A Gate Driver
• Output Short-circuit Protection
• Output Overvoltage Protection
• Synchronization Capability
• Programmable Metal-Oxide Semiconductor
Field-Effect Transistor (MOSFET) Current Limit
General Description
The HV9911 is an LED driver IC designed to control
single-switch PWM converters (buck, boost,
buck-boost and SEPIC) in a Constant Frequency or
Constant Off-time mode. The controller uses a peak
current control scheme with programmable slope
compensation
and
includes
an
internal
transconductance amplifier to control the output current
in closed loop, enabling high output current accuracy.
In the Constant Frequency mode, multiple HV9911s
can be synchronized with each other or with an
external clock using the sync pin. Programmable
MOSFET current limit enables current limiting during
Input Undervoltage and Output Overload conditions.
The IC also includes a 0.2A source and 0.4A sink gate
driver for high-power applications. An internal
9V–250V linear regulator powers the IC, eliminating the
need for a separate power supply. The HV9911
provides a TTL-compatible PWM dimming input that
can accept an external control signal with a duty ratio
of 0%–100% and a frequency of up to a few kilohertz.
The IC also provides a FAULT output which, can be
used to disconnect the LEDs in case of a Fault
condition, using an external disconnect FET.
The HV9911-based LED driver is ideal for RGB
backlight applications with DC inputs. HV9911-based
LED lamp drivers can achieve efficiency in excess of
90% for buck and boost applications.
Applications
• RGB Backlight Applications
• Battery-powered LED Lamps
• Other DC/DC LED Drivers
Package Type
16-lead SOIC
(Top view)
VIN
1
VDD
2
GATE
3
GND
4
CS
5
SC
6
RT
7
SYNC
8
16
15
14
13
12
11
10
9
FDBK
IREF
COMP
PWMD
OVP
FAULT
REF
CLIM
See
Table 2-1
for pin information.
2017 Microchip Technology Inc.
DS20005580A-page 1
HV9911
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
V
IN
to GND................................................................................................................................................ –0.5 to +250V
V
DD
to GND............................................................................................................................................ –0.3V to +13.5V
CS to GND ...................................................................................................................................... –0.3V to (V
DD
+0.3V)
PWMD to GND................................................................................................................................ –0.3V to (V
DD
+0.3V)
Gate to GND ................................................................................................................................... –0.3V to (V
DD
+0.3V)
All Other Pins to GND ..................................................................................................................... –0.3V to (V
DD
+0.3V)
Continuous Power Dissipation (T
A
= +25°C; Derate 10 mW/°C above +25°C) ................................................ 1000 mW
Operating Ambient Temperature, T
A
.......................................................................................................–40°C to +85°C
Maximum Junction Temperature, T
J(MAX)
...........................................................................................................+125°C
Storage Temperature, T
S
......................................................................................................................–65°C to +150°C
† 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:
T
A
= 25°C and V
IN
= 24V unless otherwise specified.
Parameter
INPUT
Input DC Supply Voltage Range
Shutdown Mode Supply Current
INTERNAL REGULATOR
Internally Regulated Voltage
V
DD
Undervoltage Lockout
Threshold
V
DD
Undervoltage Lockout
Hysteresis
Steady State External Voltage that
can be applied at the V
DD
Pin
REFERENCE
V
DD
UVLO
∆UVLO
V
DD(EXT)
7.25
6.65
—
—
7.75
6.9
500
—
8.25
7.2
—
12
V
V
mV
V
Note 3
V
IN
= 9V–250V, I
DD(EXT)
= 0,
PWMD connected to GND
(Note
1)
V
DD
Rising
Sym.
V
INDC
I
INSD
Min.
Note 2
—
Typ.
—
1
Max.
250
1.5
Unit
V
mA
Conditions
DC input voltage (Note
1)
PWMD connected to GND,
V
IN
= 24V (Note
1)
REF bypassed with a 0.1 µF
REF Pin Voltage
1.225 1.25 1.275
V
capacitor to GND, I
REF
= 0,
V
REF
V
DD
= 7.75V, PWMD = GND
(Note
1)
REF bypassed with a 0.1 µF
Line Regulation of Reference
capacitor to GND, I
REF
= 0,
V
REFLINE
0
—
20
mV
Voltage
V
DD
= 7.25V–12V,
PWMD = GND
Note 1:
Denotes specifications which apply over the full operating ambient temperature range of
–40°C < T
A
< +85°C
2:
See
Section 3.3 “Minimum Input Voltage at VIN Pin”
for minimum input voltage.
3:
Parameters might not be within specifications if the external V
DD
voltage is greater than V
DD(EXT)
or if V
DD
is less than 7.25V.
4:
For design guidance only
2017 Microchip Technology Inc.
DS20005580A-page 5
FPGA/CPLD
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