|Description||White Led Power Supply|
|Company||ST Microelectronics, Inc.|
|Datasheet||Download STLD20D datasheet
FEATURES High efficiency above 80% Can drive to 4 LEDs in series from 2.8V supply Constant LED current regulation Integrated LED disconnect switch that cuts the LEDs branch in shutdown mode Constant switching frequency Stable current regulation across the total input voltage range Supply voltage rejection Inherent soft start by limiting the peak inductor current Peak inductor current adjustability (STLD20DC8 only) Shutdown pin with possibility of PWM dimming control Over voltage and over temperature protection with automatic restart Low shutdown current < 1µA Small external inductor (10µH, height < 2mm) Tiny ceramic external capacitor Can be supplied by a Li-ion battery - VIN range: to 5Vdc Figure 1: Basic connection
APPLICATION White Led supply for LCD backlight Mobile phone PDA and organizers Any handsets powered from to 4.2V DESCRIPTION The is a constant switching frequency boost regulator with specific features to supply to 4 white LEDs in series. A stable LED current regulation, from 4.2V, is achieved by sensing the LED current through a low ohmic shunt resistor RLED (see figure 1). The device also includes a supply rejection circuit that prevent any kind of flickering effect on the display during dynamic supply voltage variation. A LED disconnect switch cut the LED branch to reduce the current consumption in shutdown mode. The maximum peak inductor current can be programmed. The STLD20D includes often numerous features and innovative design circuit that allows getting an efficiency above 80% across the total supply voltage range. Figure 2: Efficiency versus input voltage (ILED=20mA; Tamb=25°C)Table 1: Order Codes Part Number Marking STLD20D-DEF L2D
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.- Exposed pad is not connected to the ground of the dice. - Connect exposed pad to pin one.
OTP OSCILLATOR RAMP OSCILLATOR COMPENSATION POWER FAULT ENABLE VIN OVP
Table 2: External Components Pproposal (note 1) - Referred basic connection (figure 1) Symbol RLED CIN COUT L Parameter LED current resistance Input filtering capacitor Output capacitance Boost inductor (height < 2mm) Inductance Resistance at 500kHz Isat (RSET = 100k) VRRM IF (peak forward current) = 15V Ceramic type Test Conditions Value Unit Min. Typ. Max. µH mA Vdc µA µF
Note 1: the external components proposal should be considered as a design reference guide. The performances mentioned in the electrical characteristics table are not guaranteed for all the possible electrical parameters of the components included in this list. On an other hand the operation STLD20D is not limited with the use of components included in this list.
Table 3: Absolute Maximum Ratings Symbol VIN VESD TOP Tstg BVDS SHDN Parameter Supply voltage range ESD ratings Operating temperature Storage temperature Breakdown voltage at pin SW and TSS and VOUT Maximum voltage applied on SHDN pin HBM MIL STD 883C Test conditions Value Unit Min. Typ. Max. 5 V VIN °C V
|Related products with the same datasheet|
|Some Part number from the same manufacture ST Microelectronics, Inc.|
|STLD20D-C8 White Led Power Supply|
|STLIB4HDS Development Environment For St16 And St19 Smartcard MCU Families|
|STLV3243EB 15KV Esd Protected 2.3 to 5.5V, 400KBPS, RS-232 Transceiver With Auto-powerdown|
|STLVD111 Programmable Low Voltage 1:10 Differential LVDS Clock Driver|
|STLVD111B Programmable Low Voltage 1:10 Differential Clock Driver|
|STLVD112 High Speed Protection Switch|
|STLVD210 Differential LVDS Clock Driver|
|STLVDS050 High Speed Differential Line Drivers And Receivers|
|STLVDS104 4-port LVDS And 4-port Ttl-to LVDS Repeaters|
|STLVDS104B 4-PORT LVDS And 4-PORT TTL to LVDS Repeaters|
|STLVDS105 4-port LVDS And 4-port Ttl-to LVDS Repeaters|
|STLVDS105B 4-PORT LVDS And 4-PORT TTL to LVDS Repeaters|
|STLVDS31 High Speed Differential Line Drivers|
|STLVDS31B High Speed Differential Line Drivers|
|STLVDS32 High Speed Differential Line Receivers|
74VCX16374 : CMOS/BiCMOS->LVC/ALVC/VCX Family->Low Voltage. Low-voltage 1.8/2.5/3.3v 16-bit D-type Flip-flop With 3.6v-tolerant Inputs And Outputs (3-state, Non-inverting).
BS62LV4003 : SRAM. Very low operation voltage ~ 3.6V Very low power consumption Vcc = 3.0V C-grade: 20mA (Max.) operating current I -grade: 25mA (Max.) operating current 0.25uA (Typ.) CMOS standby current High speed access time -70 70ns (Max.) at Vcc -10 100ns (Max.) at Vcc = 3.0V Automatic power down when chip is deselected Three state outputs and TTL compatible Fully.
CXP81952M : CMOS 8-bit Single Chip Microcomputer. The is a CMOS 8-bit microcomputer which consists of A/D converter, serial interface, timer/counter, time base timer, vector interruption, high precision timing pattern generation circuit, PWM generator, PWM for tuner, 32kHz timer/event counter, remote control reception circuit, and FRC capture unit, as well as basic configurations like 8-bit CPU, ROM,.
LNW4B3YF4 : Point-Lighting LEDs. Brightness = High Brightness ;; Type 1 = Round Type ;; Type 2 = Ingaalp ;; Outline (mm) = Roundoval 5.0 ;; Lighting Color = Amber ;; Lens Color = Amber Diffused ;; Remarks = ;; Package =.
CA3162_02 : A/D Converters for 3-digit Display. The CA3162E and CA3162AE are I2L monolithic A/D converters that provide a 3 digit multiplexed BCD output. They are used with the CA3161E BCD-to-Seven-Segment Decoder/Driver and a minimum of external parts to implement a complete 3-digit display. The CA3162AE is identical to the CA3162E except for an extended operating temperature range. The CA3161E.
WP2060YD : 1.8mm Solid State LAMP. z 1.8mm DIAMETER SMALL SIZE LED LAMP. z ULTRA BRIGHTNESS IS AVAILABLE. z RELIABLE AND RUGGED. z VERSATILE MOUNTING ON P.C. BOARD OR PANEL. z AVAILABLE IN DIFFUSED LENS. z RoHS COMPLIANT. The Yellow source color devices are made with Gallium Arsenide Phosphide on Gallium Phosphide Yellow Light Emitting Diode. Notes: 1. All dimensions are in millimeters.
DPM4S22K-F : Polypropylene Film Capacitors Great for High Frequency Switching Power Supplies.
3590P-2-102L : Precision Potentiometer. Bushing mount Optional AR pin feature Plastic or metal shaft and bushings Wirewound Solder lugs or PC pins Sealable (Full body seal) Standard Resistance 100 K ohms Total Resistance Tolerance.±5 % Independent Linearity.±0.25 % Effective Electrical Angle.3600 Absolute Minimum Resistance.1 ohm 0.1 % maximum (whichever is greater) Noise.100 ohms ENR maximum.
HA5352/883 : Fast Acquisition Dual Sample and Hold Amplifier. S IGN EW N ter /tsc DE 5340 uppo il.com l S ers ME HAOM SEE hnica w.int NO ER nta 88 1 Fast Acquisition Dual Sample and Hold Amplifier This Circuit is Processed in Accordance to MIL-STD883 and is Fully Conformant Under the Provisions of Paragraph 1.2.1. Fast Acquisition 0.01%. 70ns (Max) Low Offset Error.±2mV (Max) Low Pedestal Error.±8mV (Max) Low Droop.
B2312BA1 : Female Header Profile : 5.0mm Straight.
AM3XF7 : Battery Pack Battery Product; BATTERY PK 10.5V AA SIZ ALKALINE. s: Battery Cell Size: AA ; Number of Cells: 7 ; Voltage - Rated: 10.5V ; Capacity: - ; Structure: Side to Side, 1 Row x 7 Cells ; Rechargeability: No ; Termination Style: Solder Tab ; Battery Chemistry: Alkaline ; Weight: 0.35 lb (158.76g) ; Lead Free Status: Lead Free ; RoHS Status: RoHS.
65802 SL002 : Multi-Conductor Cable 18AWG 2C UNSHLD 500ft SPOOL GRAY. s: Manufacturer: Alpha Wire ; Product Category: Multi-Conductor Cable ; RoHS: Details ; Number of Conductors: 2 ; Conductor Size: 18 ; Conductor Strand: 19 x 30 ; Shielding: Unshielded ; Length: 500 ft ; Jacket Material: Polyvinyl Chloride (PVC), Oil Resistant ; Voltage Rating: 600 V ; Outside.
AB050027083300 : CABLE CLAMP, AB05, SIZE 8-33. s: Series: Mil-C-26482 ; Accessory Type: Strain Relief Clamp ; For Use With: AB05 Series Circular Connectors ; No. of Positions: 3 ; Strain Relief Material: -.
1792906 : Free Hanging (In-Line) Terminal Block - Headers, Plug And Socket Connectors, Interconnect Plug, Female Sockets; CONN TERM BLCK PLUG 17POS 5.08MM. s: Terminal Block Type: Plug, Female Sockets ; Positions Per Level: 17 ; Pitch: 0.200" (5.08mm) ; Number of Levels: 1 ; Header Orientation: - ; Plug Wire Entry: 270° ; Termination: Screw ; Wire Gauge: 12-30.
MCS04020D6492BE100 : 64.9K Ohm 0.063W, 1/16W Chip Resistor - Surface Mount; RES 64.9K OHM 1/16W .1% SMD 0402. s: Resistance (Ohms): 64.9K ; Power (Watts): 0.063W, 1/16W ; Tolerance: ±0.1% ; Packaging: Tape & Reel (TR) ; Composition: Thin Film ; Temperature Coefficient: ±25ppm/°C ; Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant.
ST3TA102 : Ohm Trimmer Potentiometers, Variable Resistors Top Adjustment Single Turn; TRIMMER 1K OHM 0.125W SMD. s: Resistance (Ohms): 1K ; Power (Watts): 0.125W, 1/8W ; Number of Turns: Single ; Adjustment Type: Top Adjustment ; Tolerance: ±20% ; Mounting Type: Surface Mount ; Temperature Coefficient: ±100ppm/°C ; Resistive Material: Cermet ; Packaging: Cut Tape.
9-435626-0 : Dip Switch Rocker; SWITCH DIP SPST 6POS SEALED GOLD. s: Actuator Type: Rocker ; Orientation: Top Actuated ; Number of Positions: 6 ; Circuit: SPST ; Actuator Level: Flush ; Mounting Type: Through Hole ; Contact Rating @ Voltage: 0.1A @ 5VDC ; Washable: Yes ; Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant.
FRN91-24BB : DPST-NC Rocker Switch On-Mom 20A (DC); SWITCH ROCKER DPST-NC 20A 12V. s: Circuit: DPST-NC ; Switch Function: On-Mom ; Current Rating: 20A (DC) ; Voltage Rating - AC: - ; Voltage Rating - DC: 12V ; Actuator Style: Concave (Curved) ; Color - Actuator/Cap: Black ; Actuator Marking: No Marking ; Illumination Type, Color: - ; Illumination Voltage (Nominal):.
ATCA-07-101M-H : FIXED IND 100UH 5A 36 MOHM TH. s: Family: Fixed Inductors ; Manufacturer: Abracon LLC ; Series: ATCA ; Packaging: Tray ; Part Status: Active ; Type: Toroidal ; Material - Core: Powdered Iron ; Inductance: 100ÂµH ; Tolerance: Â±20% ; Current Rating: 5A ; Current - Saturation: - ; Shielding: Unshielded ; DC Resistance (DCR): 36 mOhm Max ; Q @ Freq:.