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PDF HV9912 Data sheet ( Hoja de datos )
| Número de pieza | HV9912 | |
| Descripción | Switch-mode LED Driver IC | |
| Fabricantes | Supertex | |
| Logotipo |  |
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HV9912
Switch-mode LED Driver IC
Preliminary
With High Current Accuracy and Hiccup Mode Protection
Features
► Switch mode controller for single switch
drivers
♦ Buck
♦ Boost
♦ Buck-boost and SEPIC
► Works with high side current sensors
www.DataShee►t4U.cComlosed loop control of output current
► High PWM dimming ratio
► Internal 90V linear regulator (can be
extended using external zener diodes)
► Internal 2% voltage reference
(0°C < TA < 85°C)
► Constant frequency operation
► Programmable slope compensation
► Linear & PWM dimming
► +0.2A/-0.4A gate drive
► Hiccup Mode Protection for both short circuit
and open circuit conditions
► Synchronization capability
► Pin compatible with HV9911
Applications
► LED backlight applications
► General LED lighting applications
► Battery powered LED lamps
General Description
The HV9912 is a current mode control LED driver IC designed
to control single switch PWM converters (buck, boost, buck-boost
or SEPIC) in a constant frequency 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 by synchronized to each other or to an external clock using
the SYNC pin. Programmable MOSFET current limit enables
current limiting during input under voltage 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 to Supertex’s HV9911.
It is compatible with existing HV9911 designs which have an input
voltage of less than 90V by changing ROVP1, ROVP, and RT.
Typical Application Circuit - Boost
VIN
CIN
CDD
1 VIN
2 VDD
D2
L1
Q1
GATE 3
CS 5
RSC
CREF
RSLOPE
RT
4 GND
OVP 12
6 SC
7 RT
FAULT 11
HV9912
FDBK 16
10 REF
COMP 14
Cc
RL1
9 CLIM
RL2
RR1
15 IREF
RR2
PWMD 13
SYNC 8
D1
ROVP1
CO
RCS
ROVP2
Q2
Rs
1 page  
Functional Block Diagram
HV9912
Preliminary
VIN
VDD
CLIM
www.DataSheet4U.com
CS
1:2
Linear Regulator
5.60/6.10V
+_
Blanking
TBLANK
_
+
ramp
SC
COMP
FDBK
IREF
POR OVD SCD
Hiccup/Dimming
Block
PWMD
SS
13R
R
_
+GM
2
Vbg REF
POR
SS
Q
R
S
SS
GATE
FAULT
TBLANK,SC
PWMD
OVPD
5V rising
4.5V falling
OVP
SCD
One Shot
SYNC
RT
Functional Description
PWMD
GND
Power Topology
The HV9912 is a switch-mode converter LED driver de-
signed to control a continuous conduction mode buck or
boost in a constant frequency (or constant off-time) mode.
The IC includes an internal linear regulator, which operates
from input voltages up to 90V eliminating the need for an
external power supply for the IC. The IC includes features
typically required in LED drivers like open LED protection,
output short circuit protection, linear and PWM dimming,
programmable input current limiting and accurate control of
the LED current. A high current gate drive output enables the
controller to be used in high power converters.
The HV9912 is an enhanced version of the HV9911 with
hysteretic over-voltage protection and hiccup mode short
circuit protection. The IC includes a blanking network con-
trolled by the PWMD input to prevent the short circuit protec-
tion from triggering prematurely during PWM dimming due
to the parasitic capacitance of the LED string. It also allows
the IREF pin to be pulled all the way down to GND without
triggering the short circuit protection. It is a pin compatible
replacement to the HV9911.
Linear Regulator
The HV9912 can be powered directly from its VIN pin that
withstands a voltage up to 90V. When a voltage is applied at
the VIN pin, the HV9912 tries to maintain a constant 7.75V
(typ) at the VDD pin. The regulator also has a built in under-
5
5 Page 
HV9912
Preliminary
Pin Description
Pin #
1
2
3
4
Pin
VIN
VDD
GATE
GND
5 CS
www.DataShee6t4U.com SC
Description
This pin is the input of a 90V high voltage regulator.
This is a power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor to
GND (at least 0.1µF).
This pin is the output gate driver for an external N-channel power MOSFET.
Ground return for all the low power analog internal circuitry. This pin must be connected to the return
path from the input.
This pin is used to sense the source current of the external power FET. It includes a built-in 100ns
(min) blanking time.
This pin is used to set the slope compensation.
7
RT
This pin sets the frequency of the power circuit. A resistor between RT and GND will program the
circuit in constant frequency mode.
8
SYNC
This I/O pin may be connected to the SYNC pin of other HV9912 circuits and will cause the oscillators
to lock to the highest frequency oscillator.
9
CLIM
This pin provides a programmable input current limit for the converter. The current limit can be set
by using a resistor divider from the REF pin.
10
REF
This pin provides 2% accurate reference voltage. It must be bypassed with a 0.01μF – 0.1μF
capacitor to GND.
This pin is pulled to ground when there is an output short circuit condition or output over voltage
11 FAULT condition. This pin can be used to drive an external MOSFET in the case of boost converters to
disconnect the load from the source.
This pin provides the over voltage protection for the converter. When the voltage at this pin exceeds
12 OVP 5V, the gate output of the HV9912 is turned off and FLT goes low. The IC will turn on when the
voltage at the pin goes below 4.5V.
13
PWMD
When this pin is pulled to GND (or left open), switching of the HV9912 is disabled. When an external
TTL high level is applied to it, switching will resume.
14
COMP
Stable Closed loop control can be accomplished by connecting a compensation network between
COMP and GND. This capacitor also controls the hiccup time.
15
IREF
The voltage at this pin sets the output current level. The current reference can be set using a resistor
divider from the REF pin.
16 FDBK This pin provides output current feedback to the HV9912 by using a current sense resistor.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HV9912.PDF ] | |
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