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PDF HV9963 Data sheet ( Hoja de datos )
| Número de pieza | HV9963 | |
| Descripción | Closed Loop LED Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Supertex inc.
Closed Loop LED Driver
with Enhanced PWM Dimming
HV9963
Features
► Switch-mode controller for single switch converters
● Buck
● Boost
● Buck-boost and SEPIC
► High output current accuracy
► High PWM dimming ratio (>5000:1)
► Internal 40V linear regulator
► Internal ±2% voltage reference
► Constant frequency operation with sync capability
► Programmable soft start
► 10V GATE drivers
► Hiccup mode protection for both short circuit and
open circuit conditions
General Description
The HV9963 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 accurately control the output current over all line and
load conditions. Multiple HV9963s can be synchronized to each
other or to an external clock using the SYNC pin. The IC also
provides a disconnect switch gate drive output, which can be
used to disconnect the LEDs in case of a fault condition using an
external disconnect FET. The 10V external FET drivers allow the
use of standard level FETs. The low voltage 5.0V AVDD is used to
power the internal logic and also acts as a reference voltage to set
the current level.
Applications
► RGB or white LED backlighting
► Battery powered LED lamps
► Other DC/DC LED drivers
The HV9963 includes an enhanced PWM dimming logic (patent
pending) that enables very high PWM dimming ratios.
HV9963 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 tens of kilohertz.
Typical Application Circuit
CIN
CPVDD
D2 (optional)
D1
Q1
CSC
RCS
ROVP1
CO
ROVP2
PVDD GT
VIN
CS
GND
PWMD
HCP SYNC
HV9963
SS COMP RT
OVP
FLT
FB
IREF
AVDD
RREF1
CHCP
CSS
CC RT
CAVDD
RREF2
Q2
RS
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
1 page  
HV9963
Electrical Characteristics (cont.)
(The
at TA
*
=
denotes the
25OC. VIN =
specifications which apply over the full operating
24V, CPVDD = 1.0μF, CAVDD = 1.0μF, CGATE = 2.0nF,
ambient temperature range of -40OC <
CFLT = 330pF unless otherwise noted.)
TA
<
+125OC,
otherwise
the
specifications
are
Sym
Description
Min Typ
Max Units Conditions
Output Short Circuit
GSC
VDISABLE
Gain for short circuit comparator - 1.8
Voltage at IREF pin to disable the
short circuit comparator
-
1.19
2.0
1.25
2.4
1.31
- ---
V
PWMD = VDD; FB = 3.2V;
FLT is HIGH
VOMIN
Minimum output voltage of the
gain stage
* 0.14 0.20
0.30
V IREF = GND
PWMD = VDD, IREF = 400mV;
TOFF
Propagation time for short circuit
detection
-
-
-
250
ns
FB step from 0 to 900mV;
FLT goes from high to low;
no capacitance at FLT pin
TRISE,FAULT Fault output rise time
--
-
500 ns ---
TFALL,FAULT Fault output fall time
--
-
300 ns ---
TBLANK,SC Blanking time
* 400
-
800 ns ---
Note:
* Denotes the specifications which apply over the full operating ambient temperature range of -40°C < TA < +125°C.
Functional Block Diagram
VIN
PVDD GATE GND
REF
10V Regulator
AVDD
5.0V Regulator
POR
SYNC
RT
CS
IRT
CLK
DIM
K*IRT
Blanking
SC
SQ
R Q SC
+
- Enhanced
DIM PWMD
Logic
FC
DIM
OVP
+
/12
1.25V/
1.125V
-
FT
HCP
11µA
FT
0.1V
2.1V
+
-
QS
R
FC
DIS
POR
FC
DIM
11µA
DIS
DIS
+
-
200mV
2
Blanking
DIM
HV9963
FLT
PWMD
SS
COMP
IREF
FB
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
5 Page 
HV9963
When the load is disconnected in a boost converter, the
output voltage rises as the output capacitor starts charging.
When the output voltage reaches the OVP rising threshold,
the HV9963 detects an over voltage condition and turns off
the converter. The converter is turned back on only when the
output voltage falls below the falling OVP threshold (which
is 10% lower than the rising threshold). This time is mostly
dictated by the R-C time constant of the output capacitor CO
and the resistor network used to sense over voltage (ROVP1
+ ROVP2). In case of a persistent open circuit condition, this
cycle keeps repeating; maintaining the output voltage within
a 10% band.
In most designs, the lower threshold voltage of the over volt-
age protection (VOVP – 10%) -- the point at which the HV9963
attempts to restart-- will be more than the LED string voltage.
Thus, when the LED load is reconnected to the output of the
converter, the voltage differential between the actual output
voltage and the LED string voltage will cause a spike in the
output current. This causes a short circuit to be detected and
the HV9963 will trigger short circuit protection. This behavior
continues until the output voltage becomes lower than the
LED string voltage at which point, no fault will be detected
and normal operation of the circuit will commence.
Pin Description
Pin # Name Description
1
VIN
This pin is the input of a 40V high voltage regulator, and should not be left unconnected. If a voltage at
PVDD is being applied from an external power supply, the VIN and PVDD pins should be shorted.
2
PVDD
This pin is a regulated 10V supply for the two gate drivers (FLT and GATE). It must be bypassed with a
low ESR capacitor to GND (at least 1.0μF).
3 GATE This is the GATE driver output for the switching FET.
4
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.
5
CS
This pin is used to sense the source current of the external power FET. It includes a built-in 100ns (min)
blanking time.
6 HCP This pin provides the hiccup timer in case of a fault. A capacitor at this pin programs the hiccup time.
This pin sets the frequency of the power circuit. A resistor between RT and GND will program the circuit
7 RT in constant frequency mode. The switching frequency is synchronized to the PWMD input and oscillator
will turn on once PWMD goes high.
8
SYNC
This I/O pin may be connected to the SYNC pin of other HV9963 circuits and will cause the oscillators to
lock to the highest frequency oscillator.
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.
This is a power supply pin for all internal control circuits. This voltage is also used as the reference
10 AVDD voltage both internally and externally. It must be bypassed with a low ESR capacitor to GND (at least
0.1μF).
11
FLT
This pin is used to drive an external disconnect FET which disconnects the load from the circuit during
a fault condition or during PWM dimming to achieve a very high dimming ratio.
This pin provides the over voltage protection for the converter. When the voltage at this pin exceeds
12 OVP 1.25V, the gate output of the HV9963 is turned off and FLT goes low. The IC will turn on when the voltage
at the pin goes below 1.125V.
13
PWMD
When this pin is pulled to GND (or left open), switching of the HV9963 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.
The voltage at this pin sets the output current level. The current reference can be set using a resistor
15 IREF divider from the AVDD pin. Connecting a voltage greater than 1.25V at this pin will disable the short
circuit comparator.
16 FB This pin provides output current feedback to the HV9963 by using a current sense resistor.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HV9963.PDF ] | |
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