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PDF PM6600 Data sheet ( Hoja de datos )
| Número de pieza | PM6600 | |
| Descripción | 6-rows 30 mA LEDs driver | |
| Fabricantes | STMicroelectronics | |
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PM6600
6-rows 30 mA LEDs driver with boost regulator
for LCD panels backlight
Features
■ Boost section
www.DataSheet4U.com– 4.7 V to 28 V input voltage range
– Internal power MOSFET
– Internal +5 V LDO for device supply
– Up to 36 V output voltage
– Constant frequency peak current-mode
control
– 200 kHz to 1 MHz adjustable switching
frequency
– External synchronization for multi-device
application
– Pulse-skip power saving mode at light load
– Programmable soft-start
– Programmable OVP protection
– Stable with ceramic output capacitors
– Thermal shutdown
■ Backlight driver section
– Six rows with 30 mA maximum current
capability (adjustable)
– Up to 10 WLEDs per row
– Unused rows detection
– 500 ns minimum dimming time (1 %
minimum dimming duty-cycle at 20 kHz)
– ±2.1 % current accuracy
– ±2 % current matching between rows
– LED failure (open and short circuit)
detection
VFQFPN-24 4x4
Description
The PM6600 consists of a high efficiency
monolithic boost converter and six controlled
current generators (ROWs), specifically designed
to supply LEDs arrays used in the backlight of
LCD panels. The device can manage a nominal
output voltage up to 36 V (i.e. 10 White-LEDs per
ROW). The generators can be externally
programmed to sink up to 30 mA and they can be
dimmed via a PWM signal (1% dimming duty-
cycle at 20 kHz can be managed). The device
allows to detect and manage the open and
shorted LED faults and to let unused ROWs
floating. Basic protections (Output Over-Voltage,
internal MOSFET Over-Current and Thermal
Shutdown) are provided.
Applications
■ Notebook monitors backlight
■ UMPC backlight
Table 1. Device summary
Part number
PM6600
PM6600TR
Package
VFQFPN-24 4x4 (exposed pad)
Packaging
Tube
Tape and reel
January 2008
Rev 2
1/43
www.st.com
1 page  
PM6600
2 Pin settings
2.1 Connections
Figure 2. Pin connection (through top view)
www.DataSheet4U.com
Pin settings
2.2
Pin description
Table 2. Pin functions
N° Pin
Function
1
COMP
Error amplifier output. A simple RC series between this pin and ground is
needed to compensate the loop of the boost regulator.
2
RILIM
Output generators current limit setting. The output current of the ROWs can
be programmed connecting a resistor to SGND.
3
BILIM
Boost converter current limit setting. The internal MOSFET current limit can
be programmed connecting a resistor to SGND.
Switching frequency selection and external sync input. A resistor to SGND
4
FSW
is used to set the desired switching frequency. The pin can also be used as
external synchronization input. See section 1.3 for details.
5
MODE
Current generators fault management selector. It allows to detect and
manage LEDs failures. See section 3.2 for details.
6
AVCC
+5 V analog supply. Connect to LDO5 through a simple RC filter.
Internal +5 V LDO output and power section supply. Bypass to SGND with a
7
LDO5
1 µF ceramic capacitor.
8 VIN Input voltage. Connect to the main supply rail.
5/43
5 Page 
PM6600
Electrical characteristics
Table 6. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Values
Unit
Min Typ Max
Soft start and power management
www.DataSheet4U.com
EN, Turn-On level threshold
EN, Turn-Off level threshold
DIM, high level threshold
DIM, low level threshold
EN, Pull-up current
SS, charge current
SS, End-Of-Startup threshold
SS, Reduced switching frequency
Release threshold
Current generators section
TDIM-ON,min
KR
∆IROWx
VIFB
VTH,FAULT
Minimum dimming On-Time
ROWs current coefficient
accuracy
ROWs current mismatch(1)
Feedback regulation voltage
Shorted LED fault detection
threshold
VFAULT,LOW FAULT pin low-level voltage
Thermal shutdown
RRILIM = 51 kΩ
RRILIM = 51 kΩ
RRILIM = 51 kΩ
No LEDs mismatch
IFAULT,SINK = 4 mA
TSHDN
Thermal shutdown
Turn-off temperature
1.6 V
0.8
1.3
0.8
2.5 µA
45 6
2 2.4 2.8 V
0.8
500 ns
998 ±21 V
±2 %
400 mV
8.2 V
350 mV
150 °C
Note:
The Current Mismatch is the maximum current difference among the ROWs of one device.
11/43
11 Page | ||
| Páginas | Total 43 Páginas | |
| PDF Descargar | [ Datasheet PM6600.PDF ] | |
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