LED7707 Monolithic DC/DC Converter for LED Driving
The new LED7707 is a monolithic DC/DC converter for LED driving specifically designed for LCD
backlighting and general lighting. It consists of a highly-efficient boost converter integrating a power
MOSFET and six controlled-current generators (ROWs). The device can manage an output voltage up
to 36V (example is 10 white LEDs x row). The boost section is based on a constant switching
frequency, peak current-mode architecture. The boost output voltage is controlled so that the lowest
voltage of the ROW, referred to SGND, is equal to an internal reference voltage (700 mV typical). The
input voltage range is from 4.5V up to 36V. In addition, the LED7707 has an internal 5V LDO regulator
that supplies the internal circuitry of the device and is capable of delivering up to 40 mA. The input of
the LDO is the main input voltage (VBATT). The boost section switching frequency can be externally
adjusted from 200 kHz to 1 MHz. It also has an internal fixed value of 660 kHz (typical), which eliminates
the need for a resistor, an important feature in minimum component-count applications. The frequency
pin (FSW) can also be used as the synchronization input, allowing the LED7707 to operate both as the
master or the slave. The generators can be externally programmed to sink from 16 mA up to 85 mA and
can be dimmed via a PWM signal (1 percent dimming duty-cycle at 1 kHz can be managed). For high-
current LEDs, it is possible to parallel the outputs to get the maximum output current value of 510 mA
(6 ROWs x 85 mA). The device is able to detect and manage open- and shorted-LED faults. If some
ROWs are not used, during the start up, the device is able to self-detect and automatically disconnect
the ROWs without any fault detection. Output over-voltage, internal power MOSFET over-current, and
thermal shutdown are provided as protection.
• Constant-frequency, peak, current control mode
• Internal power MOSFET
• External sync for multi-device applications
• Pulse-skip power saving mode at light load
• Programmable soft-start and over
voltage protection
• Ceramic output capacitor
• Six ROWs with 85 mA maximum current
capability (adjustable)
• Parallelable rows up to 510 mA
(6 ROWs x 85 mA)
• Up to 36V output voltage (example 10 white
LED per row)
• 2% current matching between ROWs
• LED failure (open- and short-circuit) detection
• Housed in VQFPN-24L space-saving package
Benefits
• High efficiency thanks to
adaptive-output voltage
• High-performance 36V
rated current generators
• 1% dimming duty-cycle at
1 KHz can be managed
• Keeps externals tiny
• Demo board and
application notes available
Applications
• Backlighting in LCD panels
for battery/AC adapter
supplied equipment such as:
- GPS navigator backlighting
- LCD monitor backlighting
• General lighting
Features
1.888.9LIGHT1 http://lighting.arrow.com
Product Specifications
Part Number Type Dimming
Type
Number
of LEDs/
String
Number
of Strings Configuration Input
Voltage
(VDC)
Output
Voltage
(VDC)
Output
Current
(mA)
Peak
Efficiency
(%)
Diagnostic
Capabilities Interface Markets
LED7707 Boost converter PWM 36V (example 10 white LEDs) 6 Series/parallel 4.5-36 Adaptive to 36V 6 ROWs x 85 >90 Short/open —
MMAARRKKEETTSS LLEEGGEENNDD
COMMERCIAL LIGHTING FLASHLIGHTS TRANSPORTATION BACKLIGHTING SIGNAGE
32 LED DRIVERS: ICs
LED7707 demo board
LED7707 application schematic
Arrow Electronics Lighting Group
L E D D R I V E R S : ICs 3 3
24-Bit Constant-Current LED Sink Driver
with Output Error Detection
The STP24DP05 is a monolithic, low-voltage, low current-power 24-bit shift register designed for
LED panel displays. The 24-bit are grouped into three sets of 8-bit for RGB control to simplify PCB
layout in parallel to achieve high resolution video display. In the output stage, 24 regulated current
sources were designed to provide 5 mA to 80 mA constant current to drive the LEDs. The 8 x 3 shift
registers data flow sequence order can be managed with two dedicated pins. The STP24DP05 has
a dedicated pin to activate the outputs with a sequential delay that will prevent in-rush current during
outputs turn-on. The device detection circuit checks three different conditions that can occur on the
output line: short-to-GND, short-to-VO, or open line. The data detection results are loaded in the shift
registers and shifted out via the serial line output. The detection functionality is activated with a
dedicated pin, or as an alternative, through a logic sequence that allows the user to enter or exit
from detection mode. Through three external resistors, users can adjust the output current for each
8-channel group, controlling the light intensity of LEDs.
• 20V output driving capability
• 25 MHz clock frequency
• 3.3V and 5V supply voltage range
• Up to 80 mA drive capability
per channel
• Thermal shutdown
• Thermal error flag
• Gradual outputs delay
• Short- and open-LED detection
• Controlled in-rush current
• TQFP-48 exposed pad, high thermal
efficiency package
Benefits
• Superior display quality
• Finer brightness control
through three independent
external resistors
• Accurate color balance
and white points
• Remote diagnostics
Applications
• Full-motion RGB video wall display
• Monochrome LED signs
• Billboards and scoreboards
• Large-panel LCD backlighting units
• Traffic display
• Gaming machine
• Channel letter signs
Features
Product Specifications
Part Number Type Dimming Type Number
of LEDs/
String
Number of
Strings Configuration Input
Voltage
(VDC)
Output
Voltage
(VDC)
Output
Current
(mA)
Peak
Efficiency
(%) Diagnostic Capabilities Interface Markets
STP24DP05 Linear SW/PWM signaling 20V (example 6 green LEDs) 24 Series/parallel 3.3-5 20 80 — Open/short LED detection SPI
MMAARRKKEETTSS LLEEGGEENNDD
COMMERCIAL LIGHTING FLASHLIGHTS TRANSPORTATION BACKLIGHTING SIGNAGE
Arrow Electronics Lighting Group
1.888.9LIGHT1 http://lighting.arrow.com
STP24DP05 typical application circuit
STP24DP05 evaluation board
34 LED DRIVERS: ICs
4-Bit Constant-Current Power-LED Sink Driver
STMicroelectronics has introduced the STP04CM05, a monolithic 4-bit shift register designed to supply
high-power RGGB LEDs achieving high precision color control. Each channel provides a controlled
current ranging from 80 mA to 400 mA. The device has 1 percent precision among the channels and
6 percent chip-to-chip. The STP04CM05 guarantee 20V output driving capability, allowing users to
connect more LEDs in series. The high clock frequency, 30 MHz, makes the device suitable for high data
transmission. The 3.3V voltage supply is useful in applications that interface with 3.3V microcontroller.
• 20V output driving capability
• 30 MHz clock frequency
• 3.3V and 5V supply voltage range
• Controlled in-rush current
• Thermal shutdown
• Available in SO, TSSOP, and TSSOP
exposed pad
• Adjustable output current through
one external resistor
Benefits
• Constant voltage and
constant current
• Adjustable current limit
• Simple to implement
• Over-voltage protection
• High efficiency
Applications
• Architectural lighting
• Special illumination
• Ambient lights
• Automotive interior lighting
• Light indicator for white goods
Features
Product Specifications
Part Number Type Dimming
Type Number of LEDs/String Number
of Strings Configuration Input Voltage
(VDC)
Output
Voltage
(VDC)
Output
Current
(mA)
Peak
Efficiency
(%)
Diagnostic
Capabilities* Interface Markets
STP04CM05 Linear SW/PWM signaling 20V (example 5 green LEDs) 4 Series/parallel 3.3-5.5 20 400 — TSD SPI
MMAARRKKEETTSS LLEEGGEENNDD
COMMERCIAL LIGHTING FLASHLIGHTS TRANSPORTATION BACKLIGHTING SIGNAGE
*Diagnostic capabilities: TSD: Thermal shutdown
Arrow Electronics Lighting Group
1.888.9LIGHT1 http://lighting.arrow.com
STP04CM05 evaluation board
STP04CM05 typical application diagram
L E D D R I V E R S : ICs 3 5
15W TRIAC Dimmable LED Driver Based on L6562A
The L6562A is the latest proposal for power factor correction. The application note AN2711 presents
a 15W driver for LEDs, based on single stage fly-back PFC, that is compatible with TRIAC phase-
control dimmers. The design gives luminaire manufacturers a low-cost, commonly available dimming
option for home fixtures. An additional benefit is that when not wired to a dimmer, the unit’s power
factor is over 0.9. This solution is scalable up to 60W.
• High efficiency >87%
• No large electrolytic capacitor
• Able to meet FCC class B
• High power factor >0.9
Benefits
• Solution compatible with
common TRIAC dimmers
• Small form factor
• Scalable up to 60W
Applications
• Downlight
• Dimmable ballast replacement
• Chandelier
Features
Product Specifications
Part Number Type Dimming
Type
Number
of LEDs/
String
Number of
Strings Configuration Input
Voltage
(VDC)
Output
Voltage
(VDC)
Output
Current
(mA)
Peak
Efficiency
(%)
Diagnostic
Capabilities Interface Markets
STEVAL-ILL016V1 Evaluation board TRIAC dimmable 8 (1W) 2 Series/parallel 120 VAC 36V 350 87 — —
MMAARRKKEETTSS LLEEGGEENNDD
COMMERCIAL LIGHTING FLASHLIGHTS TRANSPORTATION BACKLIGHTING SIGNAGE
Arrow Electronics Lighting Group
1.888.9LIGHT1 http://lighting.arrow.com
STEVAL-ILL016V1 evaluation board
ST LED Evaluation Boards
ST Board Order Code LED Board Description
STEVAL-ILL001V1 Dimmable driver for HB power LEDs with Viper22A (DALI connector)
STEVAL-ILL002V3 HB-LED with diagnostic (40 LED) based on STP08DP05
STEVAL-ILL002V4 HB-LED with diagnostic (40 LED) based on STP08DP05
STEVAL-ILL003V1 HB-LED without diagnostic (32 LED) based on STP16CP596
STEVAL-ILL003V2 HB-LED without diagnostic (32 LED) based on STP16CP05
STEVAL-ILL005V1 VIPer12A offline, constant-current driver for high-intensity LEDs
STEVAL-ILL006V1 VIPer22A offline, constant-current driver for high-intensity LEDs
STEVAL-ILL007V1 High intensity LED driver for MR-16 format based on L5973D
STEVAL-ILL008V1 LED flashlight demo
STEVAL-ILL009V3 OSTAR projection module
STEVAL-ILL009V4 OSRAM DRAGON LEDs module
STEVAL-ILL009V5 New RGB color control board based on STP04CM05 and ST1S10
STEVAL-ILL010V1 High-intensity LED dimming driver based on L6902
STEVAL-ILL014V1 Constant-current controller for high brightness LEDs based on STCS1
STEVAL-ILL015V1 HB-LED driver with diagnostic based on STP24DP05 and STM32
STEVAL-ILL016V1 15W offline TRIAC dimmable LED driver based on L6562AD and TSM1052 (USA Market-115V)
STEVAL-ILL018V1 OSRAM Golden DRAGON white LED module (LUW W5AM)
STEVAL-ILL018V2 OSRAM Golden DRAGON warm white LED module (LCW W5AM)
STEVAL-ILL018V3 OSRAM Golden DRAGON amber (red) LED module (LA W55M)
STEVAL-ILL018V4 OSRAM Golden DRAGON blue LED module (LB W55M)
STEVAL-TLL001V1 White LED controller based on STLD40D
STEVAL-TLL002V1 Flash driver based on STCF01
STEVAL-TLL003V1 Power Flash driver based on STCF02
STEVAL-TLL004V1 Power Flash driver based on STCF03
STEVAL-TLL005V1 Power Flash evaluation board based on STCF03 and ST7 MCU (include the STEVAL-TLL004V1)
