参数资料
型号: LT1512CN8#TR
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8
封装: 0.300 INCH, PLASTIC, DIP-8
文件页数: 8/12页
文件大小: 143K
代理商: LT1512CN8#TR
LT1512
5
1512fa
PIN FUNCTIONS
IFB: The current feedback pin is used to sense charging
current. It is the input to a current sense amplier that
controls charging current when the battery voltage is below
the programmed voltage. During constant-current opera-
tion, the IFB pin regulates at –100mV. Input resistance of
this pin is 5kΩ, so lter resistance (R4, Figure 1) should be
less than 50Ω. The 24Ω, 0.22μF lter shown in Figure 1 is
used to convert the pulsating current in the sense resistor
to a smooth DC current feedback signal.
S/S: This pin can be used for shutdown and/or synchro-
nization. It is logic level compatible, but can be tied to VIN
if desired. It defaults to a high ON state when oated. A
logic low state will shut down the charger to a micropower
state. Driving the S/S pin with a continuous logic signal of
600kHz to 800kHz will synchronize switching frequency
to the external signal. Shutdown is avoided in this mode
with an internal timer.
VIN: The input supply pin should be bypassed with a
low ESR capacitor located right next to the IC chip. The
grounded end of the capacitor must be connected directly
to the ground plane to which the GND pin is connected.
GND S, GND: The LT1512 uses separate ground pins for
switch current (GND) and the control circuitry (GND S).
This isolates the control ground from any induced volt-
age created by fast switch currents. Both pins should be
tied directly to the ground plane, but the external control
circuit components such as the voltage divider, frequency
compensation network and IFB bypass capacitor should be
connected directly to the GND S pin or to the ground plane
close to the point where the GND S pin is connected.
VSW: The switch pin is the collector of the power switch,
carrying up to 1.5A of current with fast rise and fall times.
Keep the traces on this pin as short as possible to mini-
mize radiation and voltage spikes. In particular, the path
in Figure 1 which includes SW to C2, D1, C1 and around
to the LT1512 ground pin should be as short as possible
to minimize voltage spikes at switch turn-off.
BLOCK DIAGRAM
+
IFBA
IFB
S/S
FB
5k
62k
0.08Ω
+
EA
VC
VIN
GND
1512 F02
GND S
1.245V
REF
500kHz
OSC
SYNC
SHUTDOWN
DELAY AND RESET
LOW DROPOUT
2.3V REG
ANTI-SAT
LOGIC
DRIVER
SW
SWITCH
+
IA
AV ≈ 6
COMP
Figure 2
相关PDF资料
PDF描述
LT1512IN8#TR 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8
LT1512CN8#TRPBF 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8
LT1512IN8#TRPBF 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8
LT1681CSW SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
LT1681CSW#TR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
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LT1512CS8PBF 制造商:Linear Technology 功能描述:LT1512CS8PBF