UBA3077HN Datasheet PDF - NXP Semiconductors

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UBA3077HN
NXP Semiconductors

Part Number UBA3077HN
Description Three-channel switched-mode LED driver
Page 25 Pages


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UBA3077HN
Three-channel switched-mode LED driver
Rev. 1 — 8 February 2011
Objective data sheet
1. General description
The UBA3077HN is a high efficiency LED driver in an HVQFN40 package for general LED
lighting or backlighting LCD displays.
Operating from a supply of 10 V to 42 V, it can drive up to 3 strings of 20 LEDs each. The
low voltage circuitry is powered by an external 5 V voltage supply.
The chip can operate autonomously or be controlled via a 400 kHz I2C-bus.
The peak current in each string is fixed by an external resistor. Three independent
Pulse-Width Modulated (PWM) signals are available for dimming purposes. These PWM
signals are delivered either directly by the graphic processor (direct control mode) to the
pins PWM1, PWM2 and PWM3, or generated on-board based on data sent via the
I2C-bus interface.
Each LED string is supplied by its own boost converter delivering an output voltage from
VIN up to 75 V. The switching frequency is 500 kHz.
A power saving mode is entered when all PWM signals stay LOW for a period longer than
1 s.
Several protection mechanisms are available: overvoltage, short-circuit and open LED,
overcurrent, UnderVoltage LockOut (UVLO) and overtemperature with an advanced
adaptive protection. An error self-recovery (hiccup) mechanism is available with
programmable delay time via an external capacitor.
2. Features and benefits
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„ Three-channel LED backlight driver
„ Up to 150 mA per channel
„ ±2 % absolute LED current accuracy „ Peak LED current programmable with
and channel-to-channel matching
external resistor
„ External power supply voltage from 10 V „ Three boost converters from VIN up to
to 42 V and 5 V for low voltage circuitry 75 V output voltage
„ Constant 500 kHz frequency peak
„ High efficiency up to 90 %
current mode control
„ Low value output capacitor (2 μF)
„ 14-bit PWM dimming (either defined by
system-generated PWMs, or internally
generated) from 2.0 kHz to 24 kHz (duty
cycle from 0.1 % to 100 %)
„ Accurate internal oscillator
„ All power FETs integrated



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NXP Semiconductors
UBA3077HN
Three-channel switched-mode LED driver
„ Possible control by I2C-bus with 2-bit
address plus a common address for
simultaneous configuration of several
devices
„ OverVoltage Protection (OVP)
„ Adaptive thermal protection
„ Power-On-Reset (POR)
„ Open LED detection
„ LX slope limited at 4 V/ns
„ Hiccup delay programmable via an
external capacitor
„ Dedicated reference voltage input for
host interface signals
„ 2.5 A coil current limitation
„ UVLO
„ Short-circuit protection
„ OverCurrent Protection (OCP) if
external resistor value is wrong
„ Programmable LED current rise time
limitation (250 ns or 500 ns)
„ Automatic low-power mode switching if
PWM LOW period is too long
3. Applications
„ General LED lighting
„ Display LED backlight for TV/computing applications: Content Active Backlight Control
(CABC)
4. Quick reference data
Table 1. Quick reference data
VDD(24V) = 24 V; VDD(5V) = 5 V; VDD(IO) = 5 V; Tamb = 0° C to 80° C, unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ
VDD(24V)
VDD(5V)
VDD(IO)
IDD(24V)
IDD(5V)
supply voltage (24 V)
supply voltage (5 V)
input/output supply voltage
supply current (24 V)
pin VIN
pin VDD with IDD < 35 mA
pin VDD(IO) with IDD(IO) < 1 mA
10
4.5
1.62
-
supply current (5 V)
Sleep mode; internal CCO on -
Active mode; internal CCO on;
150 mA ILED; 100 % PWM
duty cycle; all 3 channels
active
-
24
5
-
100
2
21
IDD(IO)
Vref(IREF)
input/output supply current 24 kHz PWM
reference voltage on pin
IREF
pin IREF
--
0.98 1.00
VO output voltage
pins VOUT1, VOUT2 and VOUT3 VDD(24V)
-
VFB
voltage on pin FB
PWM on; static with 100 % -
0.9
PWM duty cycle
ILED LED current
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pin FB; RIREF = 2667 Ω; RIREF 147
accuracy = 0.1 %;
PWMn = HIGH
150
tw(PWM)H
HIGH level PWM pulse
width
internal PWM generator;
external PWM signal
417
-
RDSon
drain-source on-state
resistance
- 0.5
UBA3077HN
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 8 February 2011
Max Unit
42 V
5.5 V
5.5 V
- μA
2.8 mA
- mA
100 μA
1.02 V
75 V
1.2 V
153 mA
- ns
1Ω
© NXP B.V. 2011. All rights reserved.
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NXP Semiconductors
UBA3077HN
Three-channel switched-mode LED driver
Table 1. Quick reference data
VDD(24V) = 24 V; VDD(5V) = 5 V; VDD(IO) = 5 V; Tamb = 0° C to 80° C, unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ
fsw
δmax
Vth(ovp)
switching frequency
maximum duty cycle
overvoltage protection
threshold voltage
DC-to-DC
DC-to-DC
pins VOUT1, VOUT2, VOUT3
400
-
75
500
-
77
Tamb
Tth(otp)
ambient temperature
operating
overtemperature protection die junction temperature
threshold temperature
0
-
-
150
5. Ordering information
Max Unit
600 kHz
80 %
85 V
80 °C
- °C
Table 2. Ordering information
Type number
Package
Name
Description
UBA3077HN
HVQFN40 plastic thermal enhanced very thin quad flat package; no leads;
40 terminals; body 6 × 6 × 0.85 mm
Version
SOT618-1
www.DataSheet4U.com
UBA3077HN
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 8 February 2011
© NXP B.V. 2011. All rights reserved.
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6. Block diagram
UBA3077HN
Three-channel switched-mode LED driver
VIN 19
VDD 18
HICCUP 36
INT 6
BANDGAP
REFERENCE
UVLO
SHORT/OPEN
LED
VDD
Ipeak_th
POR
VDD
CLK (500 kHz)
PWM channel 1
DIGITAL BOOST
CONTROLLER
FAULT
MANAGEMENT
ADC
9 LX1
11 PGND11
12 VOUT1
SDA 21
SCL 22
VSYNC 4
PWM1 14
PWM2 15
PWM3 16
VDD(IO) 13
LEVEL
SHIFTER
VDD
l2C-BUS
INTERFACE
CLOCK AND
MODE
MANAGEMENT
PWM
GENERATOR
CH1
PWM
CTRL CH2
CH3
32 MHz
CLK
(500 kHz)
PWM
channel 1
PWM
channel 2
PWM
channel 3
+1 V
OCP
VDD
20
IREF
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ADC
7 FB1
TEMPERATURE
SENSOR
PWM
channel 1
3 PGND12
UBA3077HN
001aan130
Only channel 1 is shown.
Fig 1. UBA3077HN block diagram
UBA3077HN
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 8 February 2011
© NXP B.V. 2011. All rights reserved.
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