1LT1510 LT1510 Constant Voltage

Constant - Current Battery

Description

Niveau: Secondaire, Lycée, Terminale
1LT1510/LT1510-5 Constant-Voltage/ Constant-Current Battery Charger Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%) * NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1). TYPICAL APPLICATIONS U , LTC and LT are registered trademarks of Linear Technology Corporation. plest, most efficient solution to fast-charge modern re- chargeable batteries including lithium-ion (Li-Ion), nickel- metal-hydride (NiMH)* and nickel-cadmium (NiCd)* that require constant-current and/or constant-voltage charg- ing. The internal switch is capable of delivering 1.5A DC current (2A peak current). The 0.1? onboard current sense resistor makes the charging current programming very simple. One resistor (or a programming current from a DAC) is required to set the full charging current (1.5A) to within 5% accuracy. The LT1510 with 0.5% reference voltage accuracy meets the critical constant-voltage charg- ing requirement for lithium cells. The LT1510 can charge batteries ranging from 2V to 20V. Ground sensing of current is not required and the battery's negative terminal can be tied directly to ground. A saturat- ing switch running at 200kHz (500kHz for LT1510-5) gives high charging efficiency and small inductor size.

• vcc ≤


• vc pin


• vcc


• input voltage


• maximum duty


• reference voltage


• µa


• current

Sujets

• Première
• Régulation
• Linear Technology
• Battery
• Current

Informations

• Publié par: profil-zyan-2012
• Nombre de lectures: 28
• Langue: English

Extrait

1 gureFiChar 2. L tiiggnB taihmu (esriteencifiEf.1 ta yc%78 > A3) OCPMET:  2 ON 2N22 -IONHIUMLITLETE 4R %52.0 k042 3R +  V 3 † % Q 250. k00  1 NIORAM D * T KOAMICSURRCONCER ON,RETAHCREGREQRREUINAMIONTI E V CC  PROG V C  BAT .338 1 k V1TO82 + V S OB W TSO DNG SNES

LT1510/LT1510-5 Constant-Voltage/ Constant-Current Battery Charger

4 OVP + C OUT  22mF T 3D 1  5N18 D 9 2 N119 F 1 1m mF k 1 0W30

FEATURES n Charges NiCd, NiMH and Lithium-Ion Batteries –– Only One 1 / 10 W Resistor Is Needed to Program Charging Current n High Efficiency Current Mode PWM with 1.5A Internal Switch and Sense Resistor n 3% Typical Charging Current Accuracy n Precision 0.5% Voltage Reference for Voltage Mode   Charging or Overvoltage Protection n Current Sensing Can Be at Either Terminal of the Battery n Low Reverse Battery Drain Current: 3 m A n Charging Current Soft Start n Shutdown Control n 500kHz Version Uses Small Inductor APPLICATIO N S n Chargers for NiCd, NiMH and Lithium Batteries n Step-Down Switching Regulator with Precision Adjustable Current Limit DESCRIPTIO N With switching frequency as high as 500kHz, The LT ® 1510 current mode PWM battery charger is the smallest, sim-

TYPICAL APPLICATIO N S C1  D1  MBRM D 1 3  20T3 0.22 m F MBRM120T3  8.2V TO 20V SW V CC   + C IN * + 10 m F – BOOST PROG  1 m F 300 W L1**  6.19k 10 m H LT1510-5 D2 MMBD914L GND  V C  0.1 m F 1k OVP SENSE BAT + + C 2 O 2 U m T F ***  4.2V  Q3 †   2N7002 NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED  R3 * TOKINORMARCONCERAMICSURFACEMOUNT  7 0. 0 2 .6 5 k %    ** COILTRONICS TP3-100, 10 µ H, 2.2mm HEIGHT (0.8A CHARGING CURRENT)  R4  COILTRONICS TP1 SERIES, 10 µ H, 1.8mm HEIGHT (< 0.5A CHARGING CURRENT)  100k *** PANASONIC EEFCD1B220  0.25%  † OPTIONAL, SEE APPLICATIONS INFORMATION 1510 F01 Figure 1. 500kHz Smallest Li-Ion Cell Phone Charger (0.8A)

plest, most efficient solution to fast-charge modern re- chargeable batteries including lithium-ion (Li-Ion), nickel- metal-hydride (NiMH)* and nickel-cadmium (NiCd)* that require constant-current and/or constant-voltage charg- ing. The internal switch is capable of delivering 1.5A DC current (2A peak current). The 0.1 W  onboard current sense resistor makes the charging current programming very simple. One resistor (or a programming current from a DAC) is required to set the full charging current (1.5A) to within 5% accuracy. The LT1510 with 0.5% reference voltage accuracy meets the critical constant-voltage charg- ing requirement for lithium cells. The LT1510 can charge batteries ranging from 2V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturat- ing switch running at 200kHz (500kHz for LT1510-5) gives high charging efficiency and small inductor size. A block- ing diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3 m A when the wall adaptor is unplugged. Soft start and shutdown features are also provided. The LT1510 is available in a 16-pin fused lead power SO package with a thermal resistance of 50 ∼ C/W, an 8-pin SO and a 16-pin PDIP. , LTC and LT are registered trademarks of Linear Technology Corporation. * NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1).

4 TNA 4 V2. + V2. .0 – + m2 C F0  2. 20 1C 01F  ON 15 MATINFORNSI 9185N1 1D 0151TLH3m  3 **L1 mF10 * IN SCCXT33IOTLORIN NT  ** C FACEMOU CILPOITAES,PAETIOPALON  -2 †   