Supertex inc.
CCM Boost LED Driver with Sub-Microsecond
PWM Dimming and Open Loop Protection
Features
►
Switch-mode controller for single switch converters
●
Boost
●
SEPIC
►
Current loop closed with sub-microsecond PWM
dimming pulses supports PWM dimming >20kHz
►
High PWM dimming ratio (>10,000:1)
►
Internal 40V linear regulator
►
Internal ±2% voltage reference
►
Programmable constant frequency operation
►
Programmable slope compensation
►
Programmable soft start
►
10V, +0.25A/-0.5A MOSFET gate drivers
►
Hiccup mode protection for both short circuit and
open circuit conditions
►
Latching protection from open loop
►
Active-Low, open-drain output to indicate a fault
condition
HV9964
General Description
The HV9964 is a current mode control LED driver IC designed to
control single switch PWM converters (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. The IC also provides a load
switch gate drive output, which can be used to disconnect the LEDs
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.
The HV9964 features Supertex’ proprietary PWM dimming control
algorithm achieving a dimming pulse of a few hundred nanoseconds
from a continuous conduction mode (CCM) or discontinuous-
conduction mode (DCM) boost converter, while maintaining the
instantaneous LED constant current determined by the reference
voltage input. This feature permits dimming frequency outside of
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.
Applications
►
LED backlights for LCD Displays
Typical Boost Application Circuit
C
IN
L
1
Q
1
D
1
R
OVP1
C
O
C
PVDD
R
SC
R
CS
R
OVP2
R
T
PVDD
RT
FLT
PWMD
HCP
VIN
GT
CS
GND
OVP
DIS
IREF
FB
Q
2
HV9964
SS COMP AVDD
R
C
AVDDR1
C
HCP
C
SS
C
C
R
S
R
R2
Doc.# DSFP-HV9964
A100112
Supertex inc.
www.supertex.com
HV9964
Ordering Information
Part Number
HV9964NG-G
HV9964NG-G M934
Package Options
16-Lead SOIC
16-Lead SOIC
Packing
45/Tube
2500/Reel
Pin Description
AVDD
1
VIN
2
DIS
3
PVDD
4
GT
5
GND
6
CS
7
RT
8
16
FLT
15
HCP
14
OVP
13
PWMD
12
FB
11
IREF
10
COMP
9
SS
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter
VIN to GND
PVDD to GND
GT, DIS to GND
AVDD to GND
IREF to GND
All other pins to GND
Junction temperature
Storage ambient temperature range
Continuous power dissipation
(T
A
= +25°C)
Value
-0.5V to +45V
-0.3V to +12V
-0.3V to (PVDD +0.3V)
-0.3V to 6.0V
-0.3V to 3.0V
-0.3V to (AV
DD
+0.3V)
+150°C
-65°C to +150°C
1000mW
16-Lead SOIC (NG)
Top Marking
YWW
HV9964NG
LLLLLLLL
Bottom Marking
CCCCCCCCC AAA
Y = Last Digit of Year Sealed
WW = Week Sealed
L = Lot Number
C = Country of Origin*
A = Assembler ID*
= “Green” Packaging
*May be part of top marking
Package may or may not include the following marks: Si or
16-Lead SOIC (NG)
Typical Thermal Resistance
Package
16-Lead SOIC
θ
ja
83
O
C/W
Stresses beyond those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
Sym
Description
(The * denotes the specifications which apply over the full operating ambient temperature range of -40
O
C < T
A
< +125
O
C, otherwise the specifications are
at T
A
= 25
O
C. V
IN
= 24V, C
PVDD
= 1.0μF, C
AVDD
= 1.0μF, C
GT
= 1.0nF, C
RT
= 1.0nF, C
DIS
= 330pF unless otherwise noted.)
Min
-
-
9.0
-
Typ
-
-
Max
40
1.5
Unit
V
mA
Conditions
DC input voltage
PWMD = GND
V
IN
= 12 - 40V, f
S
= 500kHz,
PWMD = V
DD
PV
DD
rising
PV
DD
falling
V
IN
= 9.0V, PWMD = V
DD
,
f
S
= 500kHz, C
GT
= 2.0nF
Input
V
INDC
I
INSD
Input DC supply voltage range
Shut-down mode supply current
Internal Regulator for Gate Drivers
PV
DD
UVLO
RISE
UVLO
HYST
PV
DD,MIN
Internally regulated voltage
V
DD
under voltage lockout threshold
V
DD
under voltage hysteresis
Minimum V
DD
voltage
-
*
-
*
9.5
6.65
-
8.0
10
-
500
-
10.5
7.20
-
-
V
V
mV
V
Doc.# DSFP-HV9964
A100112
2
Supertex inc.
www.supertex.com
HV9964
Electrical Characteristics
(cont.)
Sym
AV
DD
I
AVDD_ext
V
PWMD(lo)
V
PWMD(hi)
t
d
R
PWMD
I
SOURCE
I
SINK
T
RISE
T
FALL
V
OVP,rising
V
OVP,HYST
Description
Internally regulated voltage
External current draw
PWMD input low voltage
PWMD input high voltage
Latching delay time
PWMD pull down resistor
Short circuit current, sourcing
Sinking current
Output rise time
Output fall time
Over voltage rising trip point
Over voltage hysteresis
*
-
*
*
-
-
-
-
-
-
*
-
(The * denotes the specifications which apply over the full operating ambient temperature range of -40
O
C < T
A
< +125
O
C, otherwise the specifications are
at T
A
= 25
O
C. V
IN
= 24V, C
PVDD
= 1.0μF, C
AVDD
= 1.0μF, C
GT
= 1.0nF, C
RT
= 1.0nF, C
DIS
= 330pF unless otherwise noted.)
Min
4.9
0
-
2.0
-
50
0.25
0.50
-
-
1.94
-
Typ
5.0
-
-
-
100
100
-
-
34
13
2.00
0.20
Max
5.1
500
0.8
-
-
150
-
-
-
-
2.06
-
Unit
V
μA
V
V
ns
kΩ
A
A
ns
ns
V
V
Conditions
V
IN
= 9 - 40V, PWMD = V
DD
---
---
---
---
V
PWMD
= 3.3V
V
GT
= 0V
V
GT
= 10V
PVDD = 10V
PVDD = 10V
OVP rising
OVP falling
C
HCP
= 10nF – 100nF;
10μA current @ 100kHz
switching frequency
C
HCP
= 10nF – 100nF;
15μA current @ 100kHz
switching frequency
---
---
---
V
TMR
= 5.0V
C
SS
= 1nF - 10nF; 10μA
current @ 100kHz switching
frequency
V
SS
= 5.0V
Internal Low Voltage Regulator
PWM Dimming
GT Output
Over Voltage Protection
Hiccup Timer
K
HCP+
K
HCP-
V
FC
V
DLY
V
RST
I
DIS
Multiplier for charging current
Multiplier for discharging current
Voltage level to start gate driver
Voltage level for open loop detection
Voltage level restart HCP timer
Discharging current (pull down FET)
-
-
-
-
-
-
-
-
-
-
-
10
0.50
0.75
1.8
2.0
0.1
-
-
-
-
-
-
-
-
-
V
V
V
mA
Soft Start
K
SS+
I
SS-
Multiplier for charging current
Discharging current
-
-
-
1.0
0.5
-
-
-
-
mA
Note:
# Denotes specifications guaranteed by design
Doc.# DSFP-HV9964
A100112
3
Supertex inc.
www.supertex.com
HV9964
Electrical Characteristics
(cont.)
Sym
I
SLOPE
T
SETTLING
T
BLANK
T
DELAY1
R
div
V
OFFSET
GB
A
V
V
CM
V
COMP
G
m
V
OFFSET
I
COMP+
I
COMP-
I
BIAS
I
COMP,DIS
Description
Peak current out of CS pin
Settling time for current sourced
Leading edge blanking
Delay to output of output
comparator
Internal resistor divider ratio –
COMP to CS
Comparator offset voltage
Gain-bandwidth product
Open loop DC gain
Input common-mode range
Output voltage range
Transconductance
Input offset voltage
COMP sink current
COMP source current
Input bias current
Discharging current
Oscillator frequency
Oscillator frequency
Output frequency range
Maximum duty cycle
-
-
*
-
#
-
#
-
#
#
-
*
#
#
#
-
*
*
#
*
((The * denotes the specifications which apply over the full operating ambient temperature range of -40
O
C < T
A
< +125
O
C, otherwise the specifications
are at T
A
= 25
O
C. V
IN
= 24V, C
PVDD
= 1.0μF, C
AVDD
= 1.0μF, C
GT
= 1.0nF, C
RT
= 1.0nF, C
DIS
= 330pF unless otherwise noted.)
Min
150
-
100
-
-
-10
-
65
-0.3
0.7
-
-3.0
-
-
-
10
88
440
88
87
Typ
180
-
-
-
1/12
-
1.0
-
-
-
1.5
-
0.2
0.2
0.5
-
100
500
-
-
Max
216
800
250
200
-
+10
-
-
3.0
AV
DD
-0.7
-
3.0
-
-
1.0
-
112
560
560
93
Unit
μA
ns
ns
ns
-
mV
MHz
dB
V
V
mA/V
mV
mA
mA
nA
mA
kHz
kHz
kHz
%
Conditions
---
---
---
COMP = AV
DD
,
50mV overdrive at CS
---
---
75pF capacitance at COMP pin
Output open
---
A
V
> 50dB
---
---
V
FB
= AVDD, V
IREF
= 0,
V
COMP
= 0
V
FB
= 0V, V
IREF
= AVDD,
V
COMP
= AVDD -0.7V
---
V
COMP
= 5.0V
RT = 193kΩ
RT = 39kΩ
---
---
Slope Compensation
Current Sense
Internal Transconductance Opamp
Oscillator
f
OSC1
f
OSC2
F
OSC
D
MAX
Note:
# Denotes specifications guaranteed by design
Doc.# DSFP-HV9964
A100112
4
Supertex inc.
www.supertex.com
HV9964
Electrical Characteristics
(cont.)
Sym
G
SC
V
OMIN
T
OFF
T
RISE,DIS
T
FALL,DIS
T
BLANK,SC
V
FLT(LOW)
V
FB(TH)
V
COMP (TH)
Description
Gain for short circuit comparator
Minimum output voltage of the
gain stage
Propagation time for short circuit
detection
DIS output rise time
DIS output fall time
Blanking time
FLT low voltage
FB threshold voltage
COMP threshold voltage
-
*
(The * denotes the specifications which apply over the full operating ambient temperature range of -40
O
C < T
A
< +125
O
C, otherwise the specifications are
at T
A
= 25
O
C. V
IN
= 24V, C
PVDD
= 1.0μF, C
AVDD
= 1.0μF, C
GT
= 1.0nF, C
RT
= 1.0nF, C
DIS
= 330pF unless otherwise noted.)
Min
1.8
0.14
Typ
2.0
0.20
Max
2.2
0.26
Unit
-
V
Conditions
---
I
REF
= GND
PWMD = V
DD,
I
REF
= 400mV;
FB step from 0 to 900mV;
FLT goes from high to low;
no capacitance at DIS pin
330pF capacitance at DIS pin
330pF capacitance at DIS pin
---
I
FLT
= 1.0mA
---
---
Output Short Circuit
-
-
-
*
-
-
-
-
-
-
500
0
85
AVDD
-0.3
-
-
-
-
-
-
-
250
100
100
700
0.3
115
-
ns
ns
ns
ns
V
mV
V
Fault Monitor
Open Loop Detection
Doc.# DSFP-HV9964
A100112
5
Supertex inc.
www.supertex.com
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