Supertex inc.
Single Channel Boost LED Driver
with LED Wiring Fault Detection
Features
►
Switch mode controller for boost and flyback
converters
►
Discontinuous conduction mode of operation
►
High output current accuracy
►
Internal ±2% voltage reference (0
O
C < T
A
< 125
O
C)
►
Internally fixed 100kHz switching frequency
►
Hiccup mode protection for both short circuit and
open circuit conditions
►
LED wiring fault detection to detect short
cathode to ground condition
HV9860
General Description
The HV9860 is a current mode control LED driver IC designed
to control a boost or flyback LED driver in constant frequency
mode. The controller uses a peak current-mode control scheme
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 HV9860 also has a DUTY pin which can be used to set the
maximum duty cycle to either 90%(typ) or 75%(typ). The 75%
duty cycle limit can be used for flyback applications.
It 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. It includes a
wiring fault detection function that sends a flag to the boost input
power supply in case of an LED to wiring fault.
Applications
►
DC/DC LED driver applications
►
RGB or white LED backlight applications
►
Flat panel display backlighting
Typical Application Circuit
VIN
CIN
RL1
L1
D1
Q1
RO1
CO
RO2
RL2
RCS
12V
VCC
CDD
VDD
PWMI
GND
3.3V/5.0V
R
PULL-UP
FLAG
LINE
GATE
CS
OVP
DUTY
Q2
HV9860
REF
FBP
PWMO
FBN
COMP
CC
RR2
RS
CR
RR1
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
HV9860
Ordering Information
Package Option
Device
HV9860
9.90x3.90mm body
1.75mm height (max) 1.27mm pitch
16-Lead SOIC
HV9860NG-G
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter
VCC to GND
VDD to GND
GATE, PWMO to GND
REF to GND
All other pins to GND
Continuous power dissipation
(T
A
= +25°C)
16-Lead SOIC
Junction temperature
Storage temperature range
Value
-0.5V to +45V
-0.5V to +13V
-0.3V to (V
DD
+ 0.3V)
-0.3V to +6.0V
-0.3V to
(REF + 0.3V)
1000mW
+150°C
-65°C to +150°C
Pin Configuration
VDD
1
VCC
2
GATE
3
CS
4
LINE
5
NC
6
FLAG
7
PWMI
8
(top view)
16
15
14
13
12
11
10
9
DUTY
GND
OVP
REF
FBP
FBN
COMP
PWMO
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.
16-Lead SOIC (NG)
Thermal Resistance
Package
16-Lead SOIC (NG)
θ
ja
82
O
C/W
Product Marking
Top Marking
YWW
HV9860NG
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)
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
2
Tel: 408-222-8888
www.supertex.com
HV9860
Electrical Characteristics
Sym
Description
Input DC supply voltage range
Shut-down mode supply current
*
-
(The * denotes the specifications which apply over the full operating ambient temperature range of 0
O
C < T
A
< +125
O
C, otherwise the specifications are at
T
A
= 25
O
C. V
CC
= 12V, C
DD
= 1.0μF, C
R
= 0.1μF, C
GATE
= 1.0nF, C
PWMO
= 500pF, DUTY = GND, PWMI = REF unless otherwise noted.)
Min
10.0
-
Typ
-
-
Max
40.0
1
Unit
V
mA
Conditions
DC input voltage
PWMD = GND
V
CC
= 10.0 – 40.0V,
PWMI = REF
V
DD
rising
V
DD
falling
PWMI = REF;
I
REF_EXT
= 0 - 500µA
REF rising
REF falling
---
---
PWMI = 3.3V
V
GATE
= 0V
V
GATE
= 10V
---
---
Input
V
CC
I
INSD
V
DD
UVLO
RISE
UVLO
HYST
REF
UVLO
RISE1
UVLO
HYST1
V
PWM(LO)
V
PWM(HI)
R
PWMI
I
SOURCE
I
SINK
T
RISE
T
FALL
D
MAX
Internal Regulator
Internally regulated voltage
VDD under voltage lockout threshold
VDD under voltage lockout hysteresis
*
*
-
9.5
8
-
10.0
-
500
10.5
9
-
V
V
mV
Reference Voltage
Internally regulated voltage
REF under voltage lockout threshold
REF under voltage hysteresis
PWMD input low voltage
PWMD input high voltage
Internal pull down resistance at PWMD
GATE short circuit current, sourcing
GATE sinking current
GATE output rise time
GATE output fall time
Maximum duty cycle at GATE output
*
#
#
*
*
-
*
*
-
-
*
*
*
*
-
-
4.9
4.2
-
-
2
50
0.2
0.3
-
-
88
70
0.02
0.04
-
-
5.0
-
500
-
-
100
-
-
-
-
-
-
-
-
-
-
5.1
4.8
-
0.8
-
150
-
-
100
70
94
76
-
-
250
150
V
V
mV
V
V
kΩ
A
A
ns
ns
%
PWM Dimming
Boost FET Driver
---
DUTY = REF
V
PWMD
= 0V
V
PWMD
= 10V
---
---
Disconnect FET Driver
I
SOURCE,PWMO
I
SINK,PWMO
T
RISE,PWMO
T
FALL,PWMO
PWMO short circuit current, sourcing
PWMO sinking current
PWMO output rise time
PWMO output fall time
A
A
ns
ns
Oscillator
f
Osc
Oscillator frequency
*
85
100
115
kHz
---
Notes:
* Denotes specifications guaranteed by design and characterization over the full operating ambient temperature range of 0
O
C < T
A
< +125
O
C.
# Denotes specifications which are guaranteed by design.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
3
Tel: 408-222-8888
www.supertex.com
HV9860
Electrical Characteristics
(cont.)
Sym
T
BLANK
T
PROP_DELAY1
R
DIV
V
OFFSET
V
OVP,RISING
V
OVP,HYST
GB
A
V
V
CM
V
O
G
M
V
OFFSET
I
BIAS
I
COMP,DIS
T
BLANK,OCP
G
SC
V
OMIN
Description
Leading edge blanking
Delay to GATE
Internal resistor divider ratio
(COMP to CS)
Comparator offset voltage
Over voltage rising trip point
Over voltage hysteresis
*
-
#
#
*
-
Min
100
-
-
-10
1.95
-
Typ
-
-
0.083
-
2.05
0.2
Max
250
200
-
10
2.15
-
Unit
ns
ns
-
mV
V
V
Conditions
---
COMP = REF ;
50mV overdrive at CS
---
---
OVP rising
OVP falling
75pF capacitance at
COMP pin
Output open
---
A
V
≥ 60dB
---
---
---
V
COMP
= 5.0V
---
---
FBP = GND
PWMI = REF;
BP = 400mV;
FBN step from 0 to
900mV; PWMO goes
from high to low; no
capacitance at PWMO pin
---
REF = 5.0V
---
LINE voltage rising
---
Current Sense
Over Voltage Protection
Internal Transconductance Opamp
Gain-bandwidth product
Open loop DC gain
Input common-mode range
Output voltage range
Transconductance
Input offset voltage
Input bias current
Discharging current
Blanking time for OCP
Gain for short circuit comparator
Minimum output voltage of the gain
stage
#
-
#
#
-
*
#
-
*
-
*
-
60
-0.3
0.7
500
-3
-
1
500
1.8
0.14
1
-
-
-
720
-
0.5
-
-
2.0
0.20
-
-
1.5
REF-0.7
900
3
1.0
-
900
2.2
0.30
MHz
dB
V
V
μA/V
mV
nA
mA
ns
-
V
Over Current Protection
T
OFF
Propagation time to PWMO and GATE
for short circuit detection
-
-
-
300
ns
T
HCP
V
REF1
V
REF2
V
LINE
V
LINE, HYS
Internal hiccup time
COMP over-voltage threshold
FB under-voltage threshold
LINE under-voltage reset threshold
LINE threshold hysteresis
#
*
*
*
-
2.22
4.60
0.1
1.95
-
2.56
-
-
2.05
0.15
2.91
-
0.2
2.15
-
ms
V
V
V
V
Short Cathode Detect (PWMD high)
Notes:
* Specifications guaranteed by design and characterization over the full operating ambient temperature range of 0
O
C < T
A
< +125
O
C.
# Specifications which are guaranteed by design.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
4
Tel: 408-222-8888
www.supertex.com
HV9860
Power-On Sequence
For the IC to work as intended, the following power-on sequence is critical.
1. VCC to the IC
2. 3.3 or 5.0V to the pull-up resistor at FLAG
3. VIN for the boost or flyback converter
Note that 1 and 2 can be interchanged but item 3 should always occur after items 1 and 2.
Functional Block Diagram
VDD
GATE
PWMO
VCC
10V
Regulator
5.0V
Regulator
+
-
+
-
LINE
2.0V/1.8V
POR
REF
8.5/8.0V
4.5/4.0V
DUTY
+
-
100 KHz
Oscillator
SYNC
DIM
DIM
S
Q
DIM
CLK
CS
T
BLANK
+
-
R
Q
UVLO
GND
REF
POR
DIM
-
FC
Fault Logic
FLAG
FLAG
COMP
FLT
0.1V
500ns
PWMI
BLNK
FBP
FBN
BLNK
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
5
Tel: 408-222-8888
+
-
DIM
+
-
2
min
+
-
+
+
-
REF
-0.3V
LOP
OVOC
OVP
2.0V/1.8V
www.supertex.com
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