Microchip HV9912 Bedienungsanleitung
Microchip
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HV9912
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2016 Microchip Technology Inc. DS20005583A-page 1
HV9912
Features
• Switch-mode Controller for Single-switch Drivers:
-Buck
- Boost
- Buck-boost
- SEPIC
• Works with High-side Current Sensors
• Closed-loop Control of Output Current
• High Pulse-Width Modulation (PWM) Dimming
Ratio
• Internal 90V Linear Regulator (can be extended
usin
g external Zener Diodes)
• Internal 2% Voltage Reference (0°C < T
A
< 85°C)
• Constant Frequency or Constant Off-time
Operation
• Programmable Slope Compensation
• Linear and PWM Dimming
• +0.2A/–0.4A Gate Driver
• Hiccup Mode Protection for both Short-circuit and
Op
en-circuit Conditions
• Output Overvoltage Protection
• Synchronization Capability
• Pin Compatible with HV9911
Applications
• RGB Backlight Applications
• General LED Lighting Applications
• Battery-powered LED Lamps
General Description
HV9912 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 Mode 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 case of buck and buck-boost converters, the
output current can be sensed using a high-side current
sensor like the HV7800. In the Constant Frequency
mode, multiple HV9912 ICs can be synchronized with
ea
ch 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 that makes the
HV9912 suitable for high-power applications. An
in
ternal 90V linear regulator powers the IC, eliminating
the need for a separate power supply for the IC. 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. HV9912 also provides a
T
TL-compatible, low-frequency 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 HV9912 includes hiccup protection from both short
an
d open circuits, with automatic recovery after the
Fault condition is cleared.
The HV9912 is a pin-compatible replacement for
HV9911. It can be used with existing HV9911 designs,
which have input voltages of less than 90V, by
changing R
OVP1
, R
OVP
, and R
T
.
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
and Hiccup Mode Protection
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | HV9912 |
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