|
|
PDF DS2715 Data sheet ( Hoja de datos )
| Número de pieza | DS2715 | |
| Descripción | NiMH Battery Pack Charge Controller | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de DS2715 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
DS2715
NiMH Battery Pack Charge Controller
www.maxim-ic.com
DESCRIPTION
The DS2715 is well suited for cost-sensitive charger
applications where the battery is either internal or in a
unique battery pack. It has been optimized for safe
reliable charging of 1 to10 NiMH cells in series. The
DS2715 has an internal gain block that can be
selected as either a comparator or transconductance
amplifier for charge current regulation. The DS2715 is
configurable as a switched DC charger, a linear
current regulator, or a switchmode current source.
The DS2715 pre-conditions severely depleted cells
are pre-conditioned before entering full charge mode.
The DS2715 terminates full charge using the dT/dt
technique. It requires an external thermistor for dT/dt
detection. Over-temperature, under-temperature, and
over-voltage detection prevents charging under
unsafe environmental conditions. A user selectable
charge timer allows charge rates from 0.15C to 2C.
Fast-charge, top-off and charge done modes are
included for highly reliable, safe charging of NiMH
cells. Discharge mode allows the DS2715 to enter a
low power sleep state while the cell pack is being
discharged.
FEATURES
§ Charges 1 to 10 NiMH Cells
§ Fast Charges up to a 2C Rate
§ Pre-Charge and Top-Off Charge Modes Help Cell
Conditioning
§ Load Detection Allows the DS2715 to Enter Low
Power Sleep Mode (Less than 10µA) while the
Cell Pack is Discharged
§ dT/dt Charge Termination Eliminates Cell Charge
Stress
§ Monitors Voltage, Temperature, and Time for
Safety and Secondary Termination
§ Regulates Current through Either Linear Control
or Switch-Mode Control
§ LED Outputs Display Charge State
§ Small 16-Pin SO Package
PIN CONFIGURATION
CCBCIA1S
CVCC2H
LEVDS1S
LVESDS1
LLEEDD22
CSOVUSTS
VCNTG1
VCNTG0
1
2
3
4
5
6
7
8
16 VVBPAT2T
15 TVHPM1
14 RTTHM2
13 VTDHD M1
12 SVNDSD-
11 STNMSR+
10 DCIVTST
9 MDOMDSEEL
16 SO
See Table 1 for Ordering Information.
Table 1. ORDERING INFORMATION
PART
MARKING
DS2715Z+
DS2715+
DS2715Z+T&R DS2715+
+ Denotes lead-free package.
PIN-PACKAGE
16 SO
16 SO Tape-and-Reel
OPERATIONAL DIAGRAM
CHARGE
SOURCE/LOAD
GROUND
Vch
Vdd Vbatt
DS2715
THM
+-
Divide by n
n Cells
Sense
APPLICATIONS
Portable DVD Players
Portable Television Sets
Handheld Gaming
Test Equipment
Handheld POS Terminals
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 12
042605
1 page  
Figure 1. BLOCK DIAGRAM
DS2715: NiMH Cell Pack Charge Controller
DS2715
Cbias
VDD
HV
Div
Regulator
Pwr
R
E
F
VUVLO
Disable during
discharge
UVLO
State Machine
Oscillator
Pre-Charge
Low Cells
LED1
LED2
HV
HV
Fast Charge
Exit on Full
Or Timeout
Pwr
Rt start-up test
Rt
Rt
Charge
Timer
25% Top-Off Charge
(Set by Timer)
Done, Waiting for event
to start charging
M Vbatt
U Th
Ref X THM
A
D
C
Mode
Ref
Vsns
Ref
121mV,
33mV,
10mV
Disch. Detect
@-0.01V
+ Ref
- SNS+
AMP
or
Comp
-
+
R
-
+
SNS+
SNS-
Vch
RS Latch
Latch is set until
Vsns negative WRT Vss
VSS
VSS
5 of 12
5 Page 
DS2715: NiMH Cell Pack Charge Controller
TEMPERATURE SENSE
Accurate temperature sensing is needed to determine end of charge by dT/dt and to detect over temperature fault
conditions. Connecting an external 10kW NTC thermistor between THM and VSS, and a 10kW bias resistor between
Div and THM allows the DS2715 to sense temperature. To sense the temperature of the cell pack, locate the
thermistor close to the body of a cell, preferably in the middle of the cell pack. Several recommended 10kW
thermistors are shown in Table 2.
Min, Max Temperature Compare
The voltage thresholds of the THM input (VTHM-MIN, VTHM-MAX) are set to allow charging to start if 0°C < TCELL < 45°C
when using the recommended 10kW bias and 10kW thermistor. If pre-charging is in progress, and the voltage on
THM reaches VTHM-STOP, pre-charging stops and a fault condition is generated. If the voltage on THM reaches VTHM-
STOP during fast charge or top-off, charging stops and the DS2715 enters the DONE state. Fast charging will
complete normally and top-off will begin if the voltage change on THM exceeds TTERM ºC per minute (dT/dt charge
termination).
Table 2. THM1, THM2 THRESHOLDS
THM
THRESHOLD
MIN
MAX
STOP
RATIO
OF VCBIAS
0.73
0.33
0.29
THERMISTOR
RESISTANCE
(W)
27.04k
4.925k
4.085k
Semitec
103AT-2
0°C
45°C
50°C
TEMPERATURE (°C)
Fenwal
197-103LAG-A01
173-103LAF-301
4°C
42°C
47°C
Used with a 10k resistor the Semitec 103AT-2 provides about 0.9% full scale per degree sensitivity. This linearity is
shown in the curve in Figure 4. The left axis is the ratio of the sensed voltage to the divider’s input voltage (VCbias).
Figure 4. RATIO OF THM PIN TO CBIAS PIN OVER TEMPERATURE
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0
Divider Output
10 20 30 40
Degrees Centigrade
50
11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS2715.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS2710 | Single-Cell NiMH Charger |  Maxim Integrated |
| DS2711 | (DS2711 / DS2712) Loose Cell NiMH Chargers |  Maxim Integrated Products |
| DS2712 | (DS2711 / DS2712) Loose Cell NiMH Chargers | Maxim Integrated Products |
| DS2714 | Quad Loose Cell NiMH Charger | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |