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PDF HV9964NG-G Data sheet ( Hoja de datos )
| Número de pieza | HV9964NG-G | |
| Descripción | CCM Boost LED Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Supertex inc.
HV9964
CCM Boost LED Driver with Sub-Microsecond
PWM Dimming and Open Loop Protection
Features
General Description
► Switch-mode controller for single switch converters The HV9964 is a current mode control LED driver IC designed to
● Boost
● SEPIC
control single switch PWM converters (boost or SEPIC) in a constant
frequency mode. The controller uses a peak current-mode control
► Current loop closed with sub-microsecond PWM scheme (with programmable slope compensation) and includes an
dimming pulses supports PWM dimming >20kHz internal transconductance amplifier to accurately control the output
► High PWM dimming ratio (>10,000:1)
current over all line and load conditions. The IC also provides a load
► Internal 40V linear regulator
switch gate drive output, which can be used to disconnect the LEDs
► Internal ±2% voltage reference
► Programmable constant frequency operation
► Programmable slope compensation
► Programmable soft start
in case of a fault condition using an external load switch. The 10V
external FET drivers allow the use of standard level FETs. The low
voltage 5V AVDD is used to power the internal logic and also acts
as a reference voltage to set the current level.
► 10V, +0.25A/-0.5A MOSFET gate drivers
The HV9964 features Supertex’ proprietary PWM dimming control
► Hiccup mode protection for both short circuit and algorithm achieving a dimming pulse of a few hundred nanoseconds
open circuit conditions
from a continuous conduction mode (CCM) or discontinuous-
► Latching protection from open loop
conduction mode (DCM) boost converter, while maintaining the
► Active-Low, open-drain output to indicate a fault instantaneous LED constant current determined by the reference
condition
voltage input. This feature permits dimming frequency outside of
Applications
► LED backlights for LCD Displays
the audible range. The feature can also yield a wide dimming ratio
in excess of 10,000:1 at low dimming frequency.
The HV9964 provides a full protection feature set, including output-
short and open-circuit protection with auto-restart, and latching
open-loop protection with an open-drain flag output.
The HV9964 is powered by a built-in 40V linear regulator.
Typical Boost Application Circuit
CIN L1
Q1 D1
CPVDD
RSC
RCS
ROVP1
CO
ROVP2
RT
PVDD VIN GT CS
RT
GND
OVP
FLT HV9964 DIS
PWMD
HCP SS COMP AVDD
IREF FB
CHCP
CSS
CC
CAVRDDR1
RR2
Q2
RS
Doc.# DSFP-HV9964
A100112
Supertex inc.
www.supertex.com
1 page  
HV9964
Electrical Characteristics (cont.)
(The
at TA
*
=
denotes the
25OC. VIN =
specifications which apply over the full
24V, CPVDD = 1.0μF, CAVDD = 1.0μF, CGT
=op1e.0rantFin, gCRaTm=b1ie.0nnt Fte,mCpDeISr=at3u3re0praFnugneleosfs-4o0thOeCrw<isTeA
< +125OC,
noted.)
otherwise
the
specifications
are
Sym Description
Min Typ Max Unit Conditions
Output Short Circuit
GSC
VOMIN
Gain for short circuit comparator
Minimum output voltage of the
gain stage
- 1.8 2.0 2.2
* 0.14 0.20 0.26
- ---
V IREF = GND
TOFF
Propagation time for short circuit
detection
-
-
PWMD = VDD, IREF = 400mV;
-
250
ns
FB step from 0 to 900mV;
FLT goes from high to low;
no capacitance at DIS pin
TRISE,DIS DIS output rise time
TFALL,DIS DIS output fall time
TBLANK,SC Blanking time
Fault Monitor
VFLT(LOW) FLT low voltage
Open Loop Detection
VFB(TH) FB threshold voltage
VCOMP (TH) COMP threshold voltage
--
--
* 500
-
-
-
-0
-
- 85
-
AVDD
-0.3
-
-
100 ns 330pF capacitance at DIS pin
100 ns 330pF capacitance at DIS pin
700 ns ---
0.3 V IFLT = 1.0mA
115 mV ---
- V ---
Doc.# DSFP-HV9964
A100112
Supertex inc.
5 www.supertex.com
5 Page 
HV9964
Pin Description (16-Lead SOIC)
Pin # Name Description
1
AVDD
This is a power supply pin for all internal control circuits. This voltage is also used as the reference volt-
age both internally and externally. It must be bypassed with a low ESR capacitor to GND (at least 0.1μF).
2 VIN This pin is the input of a 40V high voltage regulator.
3
DIS
This pin is used to drive an external load switch which disconnects the load from the circuit during a
fault condition or during PWM dimming to achieve a very high dimming ratio.
4
PVDD
This pin is a regulated 10V supply for the two gate drivers (DIS and GT). It must be bypassed with a low
ESR capacitor to GND (at least 1.0μF).
5 GT This is the gate driver output for the switching FET.
6
GND
Ground return for all the low power analog internal circuitry as well as the gate drivers. This pin must be
connected to the return path from the input.
7
CS
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 sets the frequency of the power circuit. A resistor between RT and GND will program the circuit
8 RT in constant frequency mode. The switching frequency is synchronized to the PWMD input and oscillator
will turn on once PWMD goes high. This pin must be bypassed to AVDD using a 1.0nF capacitor.
9
SS
This pin is used to provide soft start upon turn-on of the IC. A capacitor at this pin programs the soft start
time.
10
COMP
Stable Closed loop control can be accomplished by connecting a compensation network between COMP
and GND.
The voltage at this pin sets the output current level. The current reference can be set using a resistor
11 IREF divider from the AVDD pin. Connecting a voltage greater than 1.25V at this pin will disable the short
circuit comparator.
12 FB This pin provides output current feedback to the HV9964 by using a current sense resistor.
13
PWMD
When this pin is pulled to GND (or left open), switching of the HV9964 is disabled. When an external TTL
high level is applied to it, switching will resume.
This pin provides the over voltage protection for the converter. When the voltage at this pin exceeds
14 OVP 1.25V, the gate output of the HV9964 is turned off and DIS goes low. The IC will turn on when the voltage
at the pin goes below 1.125V.
15 HCP This pin provides the hiccup timer in case of a fault. A capacitor at this pin programs the hiccup time.
16 FLT This open-drain, active-low output indicates the presence of a fault condition.
Doc.# DSFP-HV9964
A100112
Supertex inc.
11 www.supertex.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HV9964NG-G.PDF ] | |
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