|
|
PDF RT9534 Data sheet ( Hoja de datos )
| Número de pieza | RT9534 | |
| Descripción | High Efficiency Switching Mode Battery Charger | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RT9534 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
RT9534
High Efficiency Switching Mode Battery Charger
General Description
The RT9534 is a PWM switch mode battery charger
controller to fast charge single or multiple Li-Ion, NiMH
and NiCd batteries, using constant current or constant
voltage control. Maximum current can be easily
programmed by external resistor. The constant voltage
output can support up to 22V with 0.5% accuracy.
A third control loop limits the input current drawing from
the adapter during charging. This allows simultaneous
operation of the equipment and fast battery charging
without over loading to the adapter.
The RT9534 can charge batteries from 2.5V to 22V
with dropout voltage as low as 0.4V. A diode is not
required in series with the battery because the charger
automatically enters a 10μA sleep mode when the
adapter is unplugged. A logic output indicates Li-Ion full
charge when current drops to 20% of the full-scale
programmed charge current.
The RT9534 is available in WQFN-24L 4x4 Package.
Features
Fast Charging for Li-Ion, NiMH and NiCd Batteries
Adjustable Battery Voltages from 2.5V to 22V
High Efficiency : Up to 95%
Charging Current Programmed by Resistor
Precision 0.5% Charging Voltage Accuracy
Provide 5% Charging Current Accuracy
Input Current Limit Maximizes Charging Rate
Synchronous Converter with 400kHz Switching
Frequency
Flag Indicates Li-Ion Charge Completion
Auto Shutdown with Adapter Removal
Applications
Notebook Computers
Portable Instruments
Chargers for Li-lon, NiMH, NiCd and Lead Acid
Rechargeable Batteries
Simplified Application Circuit
VIN
M1
SI 4435
RS4
CIN
R1
S1
R2
C1
R3
R4 R5
C5
C3
C4
200
C2
V5V
ACN
ACP
ACDRV
BOOT
TG
EN
VIN
ISET
VC
SW
RT9534
BG
PGND
SGND
FBR
VFB
MODE
NTC
STATUS
SS
C7
R6
D2
MMSD4148T1G
D3
MMSD4148T1G
To VHH Pin
M2
SI4412
C8
L1
RF2
VBATT = 2.5 1+ RF1+200
RS1 BATT
M3
SI4412
RS3
RS2
SGND
S2 V5V
RF2
RF1
CBATT
Css C9
R9
RNTC
R 10
C6 C11
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9534-00 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
The RT9534 is a current mode PWM step-down
switching charger controller. The battery DC charge
current is programmed by a resistor R4 at the ISET pin
and the ratio of sense resistor RS2 over RS1 in the
typical application circuit. Amplifier CA converts the
charge current through RS1 to a much lower sampled
current ICHG (ICHG = IBATT x RS1 / RS2) fed into the
ISET pin. Amplifier EA compares the output of CA with
2.5V reference voltage and drives the PWM loop to
force them to be equal. Note that ICHG has both AC
and DC components. High DC accuracy is achieved
with averaging filter R3 and C3 at ISET pin. ICHG is
mirrored to go through R4 and generates a ramp signal
that is fed to the PWM control comparator, forming the
current mode inner loop. An internal LDO generates a
5V to power topside FET gate driver. For batteries like
lithium that require both constant current and constant
voltage charging, the 0.5% 2.5V reference and the
voltage amplifier VA reduce the charge current when
battery voltage reaches the normal charge voltage level.
For NiMH and NiCd, VA can be used for over voltage
protection.
RT9534
CL Amplifier
The amplifier CL monitors and limits the input current,
normally from the AC adapter, to a preset level (100mV
/ RS4). At input current limit, CL will supply the
programming current at ISET pin, thus reducing battery
charging current.
Charge STATUS
When the charger is in voltage mode and the charge
current level is reduced to 20%, STATUS pin will turn to
logic high. This charge completion signal can be used
to start a timer for charge termination. A 0.1F
capacitor from STATUS to ground is needed to filter the
sampled charging current ripple.
ACDRV Driver
The ACDRV pin drives an external P-MOSFET to avoid
reverse current from battery to input supply. When
input supply is removed, the RT9534 goes into a low
current, 10A maximum, sleep mode as VIN drops
below the battery voltage.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9534-00 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT9534
110
108
106
104
102
100
98
96
94
92
90
-50
VICHG vs. Temperature
VIN = 4.5V
VIN = 12V
VIN = 28V
-25 0 25 50 75 100 125
Temperature (°C)
Feedback Voltage vs. Temperature
2.6
2.55
2.5
2.45
2.4
2.35
2.3
-50 -25
VIN = 4.5V
VIN = 12V
VIN = 28V
0 25 50 75 100 125
Temperature (°C)
Switching Frequency vs. Input Voltage
400
395
390
385
380
375
370
3 6 9 12 15 18 21 24 27 30
Input Voltage (V)
BATT Bias Current vs.Temperature
14
12
10
8
6
4
2
0
-50
-25
0 25 50 75 100 125
Temperature (℃)
Charge Enable
Charge Enable
VBATT
(5V/Div)
SW-GND
(10V/Div)
EN
(2V/Div)
IBATT
(1A/Div)
VIN = 16V, VBATT = 12V, IBATT = 2A
Time (2.5ms/Div)
EN
(2V/Div)
VBATT
(5V/Div)
SW-GND
(10V/Div)
IBATT
(1A/Div)
VIN = 16V
VBATT = 12V
IBATT = 2A
Time (2.5ms/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9534-00 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT9534.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RT9531 | High Efficiency Switching Mode Battery Charger |  Richtek |
| RT9534 | High Efficiency Switching Mode Battery Charger | Richtek Technology |
| RT9535 | High Efficiency Switching Mode Battery Charger | Richtek Technology |
| RT9535A | High Efficiency Switching Mode Battery Charger | Richtek Technology |
| 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 |