HV9912 Datasheet, PDF (1/20 Pages) Supertex, Inc – Switch-mode LED Driver IC With High Current Accuracy and Hiccup Mode Protection

HV9912
Switch-Mode LED Driver IC with High Current Accuracy
and Hiccup Mode Protection
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
using 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
Open-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
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 that makes the
HV9912 suitable for high-power applications. An
internal 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
TTL-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
and 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
16-lead SOIC
(Top View)
See Table 2-1 for pin information.
VIN 1
VDD 2
GATE 3
GND 4
CS 5
SC 6
RT 7
SYNC 8
16 FDBK
15 IREF
14 COMP
13 PWMD
12 OVP
11 FAULT
10 REF
9 _CLIM
 2016 Microchip Technology Inc.
DS20005583A-page 1