Microchip HV9911 Manual de Usario

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2017 Microchip Technology Inc. DS20005580A-page 1
HV9911
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
Applications
RGB Backlight Applications
Battery-powered LED Lamps
Other DC/DC LED Drivers
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.
Package Type
VIN
VDD
GATE
GND
CS
SC
RT
SYNC
FDBK
IREF
COMP
PWMD
OVP
FAULT
REF
CLIM
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
16-lead SOIC
(Top view)
See Table 2-1 for pin information.
Switch-Mode LED Driver IC with High Current Accuracy
HV9911
DS20005580A-page 2 2017 Microchip Technology Inc.
Functional Block Diagram
Vbg
VIN
VDD
REF
GATE
+
_
+
_ 13R
R
FDBK
IREF
COMP
GND PWMD
POR
RT
SYNC
S
R Q
Gm
+
_
CLIM
100ns
Blanking
+
_
2
CS
DIS
SC
+
_
ramp
1:2
DIS
+
_
VBG
OVP
R
S
Q
FAULT
POR
DIS
Q
One Shot
Linear
Regulator
2017 Microchip Technology Inc. DS20005580A-page 3
HV9911
Typical Application Circuit
6
7
10
9
15 8
13
14
16
11
12
5
3
1
2
4
C
IN
C
DD
C
REF
R
R2
R
R1
R
L1
R
L2
R
T
R
SLOPE
R
SC
SC
R
CS
R
OVP1
R
OVP2
C
O
D1
Q1
L1
Q2
C
C
R
S
VIN
VDD
GND
SC
RT
REF
CLIM
IREF SYNC
PWMD
COMP
FDBK
FAULT
OVP
CS
GATE
HV9911
(Boost)
Typical Application Circuit
L1
6
7
10
9
15 8
13
16
14
5
3
11
12
1
2
4
CC
C
IN
C
DD
C
REF
R
R2
R
R1
R
L1
R
L2
R
T
R
SLOPE
R
SC
R
CS
C
O
D1
Q1
R
S
HV7800
VIN
VDD
GND
SC
RT
REF
CLIM
IREF SYNC
PWMD
COMP
FDBK
FAULT
GATE
CS
OVP
HV9911
(Buck)

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: HV9911

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