HV9989 Datasheet PDF - Microchip

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HV9989
Microchip

Part Number HV9989
Description Three-Channel CCM/DCM Boost LED Driver
Page 22 Pages


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HV9989
Three-Channel CCM/DCM Boost LED Driver
with Sub-Microsecond PWM Dimming
Features
• Three out-of-phase constant-current boost
converters
• Current loop closed, with sub-microsecond PWM-
dimming pulses, supports PWM dimming >20 kHz
• Internal 40V linear regulator
• External clock input
• External individual reference inputs
• Individual PWM dimming inputs
• Programmable slope compensation
• +0.2A/-0.4A gate drivers
• Independent short circuit protection with hiccup
for each channel
• Latching output open-circuit protection
Applications
• LCD panel back-lighting
Description
HV9989 is a three-channel peak current mode PWM
controller designed to drive single switch converters in
a constant-output current mode. It can be used for driv-
ing either RGB LEDs or multiple channels of white
LEDs.
HV9989 features a proprietary PWM-dimming control
algorithm that achieves a dimming pulse of a few hun-
dred nanoseconds from a Continuous-Conduction
Mode (CCM) or Discontinuous-Conduction Mode
(DCM) boost converter, while maintaining the instanta-
neous LED constant current determined by the external
reference voltage input. This feature permits a dimming
frequency outside of the audible range, and can also
yield a wide dimming ratio in excess of 10,000:1 at low
dimming frequency. Each of the three channels fea-
tures individual PWM-dimming and reference voltage
inputs.
The switching frequencies of the three converters are
controlled by an external clock signal, such that the
channels operate at a switching frequency of 1/12th the
external clock frequency, and are positioned 120° out-
of-phase to reduce the input current ripple.
HV9989 provides a full protection feature set, including
output-short and open-circuit protection, for each indi-
vidual channel that is independent from the other chan-
nels.
HV9989 is powered by a built-in 40V linear regulator.
2014 Microchip Technology Inc.
DS20005296B-page 1



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HV9989
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DS20005296B-page 2
2014 Microchip Technology Inc.



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Pin Diagram
HV9989
VDD1
40
1
FLT1
CS1
COMP1
FDBK1
REF1
OVP1
VIN
VDD
EN 10
11
GND
31
30
VDD3
FLT3
CS3
COMP3
FDBK3
REF3
OVP3
CLK
FLG
21
20
VIN_SNS
Typical Application Circuit
40-Lead QFN
VIN
VIN_SNS
FLG
VDD
VDD1
VDD2
VDD3
PWMD1
PWMD2
PWMD3
REF1 HV9989
REF2
REF3
EN
CLK
GND
COMP1
COMP2
COMP3 SKIP
SC
GATE1
CS1
GND1
OVP1
FLT1
FDBK1
GATE2
CS2
GND2
OVP2
FLT2
FDBK2
GATE3
CS3
GND3
OVP3
FLT3
FDBK3
2014 Microchip Technology Inc.
DS20005296B-page 3



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HV9989
1.0 ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS †
VIN to GND ........................................................ -0.5V to +45V
VDD to GND, VDD 1-3 to GND ..........................--0.3V to +10V
All other pins to GND ......................... ....-0.3V to (VDD + 0.3V)
Operating temperature ....................................-40°C to +85°C
Storage temperature .....................................-65°C to +150°C
Continuous power dissipation (TA = +25°C).............4000 mW
† Notice: Stresses above those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at those or any other conditions, above those indi-
cated in the operational listings of this specification, is not
implied. Exposure to maximum rating conditions for extended
periods may affect device reliability.
1.1 ELECTRICAL SPECIFICATIONS
TABLE 1-1: ELECTRICAL CHARACTERISTICS (SHEET 1 OF 3)1
Symbol Parameter
Note Min Typ Max Units Conditions
Input
VINDC
IINSD
IIN
Input DC supply voltage
Shut-down mode supply
current
Supply current
Internal Regulator
1 10 — 40 V DC input voltage
1 — — 500 μA EN = 0.8V
4.5
mA
EN 2.0V; PWMD1 = PWMD2
= PWMD3 = GND
VDD
VDD
Internally regulated voltage
Load regulation
1
UVLO
VDD under voltage lockout
threshold
UVLOHYST
VDD under voltage hystere-
sis
7.0
8.1
V
VIN= 11V; EN = GND;
External IDD = 30mA
VIN= 11V; EN = GND;
80
mV
External IDD(A) = 10mA,
IDD(B) = 30mA
VDD = VDD(A) - VDD(B)
5.9 — 6.4 V VDD falling
- 500 - mV VDD rising
PWM Dimming (PWMD1, PWMD2 and PWMD3)
VPWMD(lo) PWMD input low voltage
1 — — 0.8 V
VPWMD(hi) PWMD input high voltage
1
2.0 —
V
RPWMD PWMD pull down resistor
— 80 — 160 kVPWMD = 5.0V
Td Delay time to PWMD latch 2 50 — 150 ns
TDP DMAX inhibit delay
2
— 400 —
ns
Note 1: Applies over the full operating ambient temperature range of 0°C < TA < +85°C.
2: For design guidance only.
DS20005296B-page 4
2014 Microchip Technology Inc.



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