Supertex inc.
Boost LED Driver with
Low-side LED Wiring Fault Detection
Features
►
Switch mode controller for boost LED driver
►
High output current accuracy
►
Constant frequency operation
►
Hiccup mode protection for both short circuit
and open circuit conditions
►
LED wiring fault detection
HV9966
General Description
Applications
The HV9966 is a current mode control LED driver IC designed to control a
boost LED driver in 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 disconnect switch gate drive output, which can be used to achieve good
PWM rise and fall times for the LED current using an external disconnect
FET.
The HV9966 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 HV9966 includes LED wiring fault detection function which turns off
the boost converter and sends a shutdown signal to the external power
supply in case the cathode of the LED string (or any tap in the LED string)
is shorted to ground. A dedicated power supply input keeps the wiring fault
detection circuitry armed even in the absence of the V
CC
supply.
►
RGB or white LED backlighting
Typical Boost Application Circuit
VBST
C
IN
L
1
R
IN
ZD
1
R
SC
R
CS
R
OVP2
R
2
VIN GT
VCC
CS
GND
OVP
DR
R
3
Q
1
D
1
C
O
R
OVP1
R
1
C
VIN
12V
C
VCC
PWMD
FLAG
RT
HV9966
DUTY COMP
VDD
R
C
DD R1
REF
DIS
FB
Q
2
R
T
C
C
R
S
R
R2
Doc.# DSFP-HV9966
A051412
Supertex inc.
www.supertex.com
HV9966
Ordering Information
Part Number
HV9966NG-G
HV9966NG-G M934
Package Option
Packing
16-Lead SOIC (Narrow Body) 45/Tube
16-Lead SOIC (Narrow Body) 2500/Reel
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter
VDD to GND
GATE, DIS to GND
VDD to GND
VIN to GND
DR, RT, FLAG to GND
REF to GND
All other pins to GND
Junction temperature
Storage ambient temperature range
Continuous power dissipation
(T
A
= +25°C)
Value
-0.5V to +16V
-0.3V to (V
CC
+0.3V)
-0.3V to +3.8V
-0.3V to +3.8V
-0.3V to (V
IN
+0.3V)
-0.3V to +1.5V
-0.3V to (V
DD
+0.3V)
+150°C
-65°C to +150°C
1000mW
Pin Description
DR
1
DUTY
2
RT
3
CS
4
GND
5
GATE
6
VCC
7
DIS
8
16
FLAG
15
VIN
14
PWMD
13
FB
12
REF
11
COMP
10
OVP
9
VDD
16-Lead SOIC (NG)
(top view)
Product Marking
Top Marking
YWW
HV9966NG
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.
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
Typical Thermal Resistance
Package
16-Lead SOIC
θ
j-a
83
O
C/W
Package may or may not include the following marks: Si or
16-Lead SOIC (NG)
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
CC
= 12V, C
VCC
= 1.0μF, C
DD
= 1.0μF, C
GATE
= 1.0nF, C
FLT
= 500pF, R
T
= 374kΩ, DUTY = GND unless otherwise noted.)
Min
-
-
*
-
10
-
9.0
-
Typ
12
-
-
1.0
Max
14
1.5
9.5
-
Unit
V
mA
V
V
Conditions
DC input voltage
PWMD to GND
V
CC
rising
V
CC
falling
PWMD = V
DD
; f
s
= 300kHz;
I
VDD_EXT
= 0 -500μA
V
CC
rising
V
CC
falling
Input
V
CCDC
I
CCSD
UVLO
RISE,VCC
UVLO
HYST,VCC
Input DC supply voltage range
Shut-down mode supply current
V
CC
under-voltage lockout threshold
V
CC
under-voltage hysteresis
Internal Low Voltage Regulator
V
DD
UVLO
RISE,VDD
UVLO
HYST,VDD
Internally regulated voltage
V
DD
under-voltage lockout threshold
V
DD
under-voltage hysteresis
-
*
-
3.23
3.03
-
3.30
3.10
0.20
3.37
3.17
-
V
V
V
Note:
# Denotes specifications guaranteed by design
Doc.# DSFP-HV9966
A051412
2
Supertex inc.
www.supertex.com
HV9966
Electrical Characteristics
(cont.)
Sym
V
PWMD(lo)
V
PWMD(hi)
R
PWMD
I
SOURCE
I
SINK
T
RISE
T
FALL
I
SOURCE,DIS
I
SINK,DIS
T
RISE,DIS
T
FALL,DIS
Description
PWMD input low voltage
PWMD input high voltage
PWMD pull down resistor
GATE short circuit current, sourcing
GATE sinking current
GATE output rise time
GATE output fall time
GATE short circuit current, sourcing
GATE sinking current
GATE output rise time
GATE output fall time
Oscillator frequency
Oscillator frequency
Output frequency range
Maximum duty cycle at GATE output
*
*
-
*
*
-
-
*
*
-
-
-
-
#
*
-
*
-
#
#
*
*
-
-
(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
CC
= 12V, C
VCC
= 1.0μF, C
DD
= 1.0μF, C
GATE
= 1.0nF, C
FLT
= 500pF, R
T
= 374kΩ, DUTY = GND unless otherwise noted.)
Min
-
2.0
50
0.25
0.50
-
-
0.02
0.04
-
-
88
220
80
87
67
100
-
-
-10
-
1.94
-
-
Typ
-
-
100
-
-
-
-
-
-
-
-
100
250
-
-
-
-
-
0.167
-
-
2.00
0.2
-
Max
1.0
-
100
-
-
70
35
-
-
300
150
112
280
300
93
73
250
200
-
10
100
2.06
-
200
Unit
V
V
kΩ
A
A
ns
ns
A
A
ns
ns
kHz
kHz
kHz
%
%
ns
ns
-
mV
Ω
V
V
ns
Conditions
---
---
V
PWMD
= V
DD
V
GATE
= 0V
V
GATE
= V
CC
---
---
V
GATE
= 0V
V
GATE
= V
CC
---
---
R
T
= 374kΩ
R
T
= 249kΩ
---
DUTY = GND
DUTY = V
DD
---
COMP = V
DD
;
50mV overdrive at CS
---
---
---
OVP rising
OVP falling
50mV overdrive
PWM Dimming
Boost FET Driver
Disconnect FET Driver
Oscillator
f
OSC1
f
OSC2
F
OSC
D
MAX
Current Sense
T
BLANK
T
PROP_DELAY1
R
DIV
V
OFFSET
R
PULLDOWN
V
OVP,RISING
V
OVP,HYST
T
PROP_DELAY
Leading edge blanking
Delay to Gate falling
Internal resistor divider ratio – COMP
to CS
Comparator offset voltage
Pull down FET resistance
Over voltage rising trip point
Over voltage hysteresis
Propagation delay time
Over Voltage Protection
Note:
# Denotes specifications guaranteed by design
Doc.# DSFP-HV9966
A051412
3
Supertex inc.
www.supertex.com
HV9966
Electrical Characteristics
(cont.)
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
CC
= 12V, C
VCC
= 1.0μF, C
DD
= 1.0μF, C
GATE
= 1.0nF, C
FLT
= 500pF, R
T
= 374kΩ, DUTY = GND unless otherwise noted.)
Min
Typ
Max
Unit
Conditions
75pF capacitance at COMP
pin
Output open
---
A
V
≥ 65dB
---
---
---
PWMD = GND;
COMP = 2.0V
---
V
IN
rising
V
IN
falling
---
V
DR
= V
REF
+0.1V
Current into DR pin = 50μA
Current into DR pin = 1mA
FLAG = GND
FLAG = GND
C
FLAG
= 500pF
C
FLAG
= 500pF
---
---
50mV overdrive
V
COMP
= 2.0V
Internal Transconductance Opamp
GB
A
V
V
CM
V
O
G
m
V
OFFSET
I
BIAS
I
COMP,DIS
I
COMP,LKG
GB
BUFFER
Gain-bandwidth product
Open loop DC gain
Input common-mode range
Output voltage range
Transconductance
Input offset voltage
Input bias current
Discharging current with pull down FET
COMP leakage current
Gain-bandwidth of the buffer
V
IN
under voltage lockout threshold
V
IN
under voltage hysteresis
Comparator reference voltage
Propagation delay time
Clamp Voltage at DR pin
Source current from FLAG pin
Sink current into FLAG pin
GATE output rise time
GATE output fall time
COMP rail comparator detect threshold
FB low comparator threshold
Propagation delay time
Multiplication factor for over-current
protection
Minimum voltage at output of gain stage
Blanking time for OCP
Propagation delay time
#
-
#
#
-
*
#
-
*
#
*
-
*
-
*
V
CLAMP,DR
I
SOURCE,FLAG
I
SINK,FLAG
T
RISE,FLAG
T
FALL,FLAG
V
REF1
V
REF2
T
PROP_DELAY
K
OCP
V
OCP
T
BLANK,OCP
T
PROP_DELAY
*
-
-
-
-
-
-
-
-
65
-0.3
0.7
-
-3.0
-
10
-
20
2.62
-
1.58
-
2.00
2.75
10
10
-
-
-
-
-
1.0
-
-
-
500
-
0.5
-
-
-
2.76
0.20
1.75
-
-
-
-
-
-
-
V
DD
-0.3
0.1
-
-
-
1.5
V
DD
-0.7
-
3.0
1.0
-
10
-
2.90
-
1.92
200
2.50
3.20
-
-
40
40
-
-
200
MHz
dB
V
V
μA/V
mV
nA
mA
nA
kHz
V
V
V
ns
V
V
mA
mA
ns
ns
V
V
ns
VIN Pin
UV
LO_RISE,VIN
UV
LO_HYST,VIN
V
REF
T
PROP_DELAY
DR and FLAG pins
Wiring Fault Detection (PWMD high)
Over Current Protection
*
*
*
*
1.95
0.22
500
-
2.00
-
-
-
2.05
0.24
900
200
-
V
ns
ns
---
REF = GND
---
50mV overdrive
Note:
# Denotes specifications guaranteed by design
Doc.# DSFP-HV9966
A051412
4
Supertex inc.
www.supertex.com
HV9966
Functional Block Diagram
GT
DIS
VIN
2.76V/2.56V
2.0V
DR
VCC
+
Regulator
9.25V/
8.25V
GTB
+
+
-
-
FLAG
FLAG
POR2
DIM
n16
OLD
POR2
CLR
-
POR1
S
R
Q
VDD
3.1V/
2.9V
+
-
n16
S
R
Q
EN
4 bit
Counter
n16
CLK/4
/4
CLK
Clock
Sync
DIM
RT
CLK
S
Q
FLAG
Monoshot
DIM
Monoshot
POR2
CS
Blanking
+
-
R
Q
CLK/4
OL1
GTB
GND
1
Monoshot
DIM FLT
CLR1
FLT
OL2
CLR
EN
8 bit
Counter
n256
RST
COMP
FLT
DIM
VDD - 0.3V
+
-
+
-
OL1
DIM
SC
RST
OLD
OL2
OC
OV
CLR1
0.1V
REF
FB
+
-
2
min
S
Q
POR1
DIM
RST
Fault
Latch
Q
FLT
Monoshot
R
DIM
Latch
S
R
+
-
OC
Monoshot
POR1
OV
+
-
OVP
2.0V/1.8V
PWMD
Note:
Circuit in shaded area is powered off the VIN pin; rest of the circuit is powered off the VDD regulator (powered off VCC for the gate drivers)
Doc.# DSFP-HV9966
A051412
5
Supertex inc.
www.supertex.com
嵌入式系统
