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参数资料
| 型号： | TPS65562RGTT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 16/17页 |
| 文件大小： | 632K |
| 代理商： | TPS65562RGTT |
www.ti.com
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4
OFF
ON
OFF
0[V]
SW
VSW
0[V]
VBAT
VZERO
VOUT
VA
0[A]
ISW
IPEAK
0[A]
IOUT
IPEAK /NTRUN
ti
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e
3
ti
m
e
2
ti
m
e
1
L
o
g
ic
I
V
I
T
ti
m
e
5
OFF
ON
OFF
0[V]
SW
VSW
0[V]
VBAT
VOUT
VA
ISW
IPEAK
IOUT
IPEAK /NTRUN
I
V
I
T
~~
CHG
XFULL
ON
OFF
VFULL
~~
VOUT
VA
VSW
VBAT
~~
0[A]
~~
0[A]
~~
ISW
~~
IOUT
~~
Control Charging
T
ON
I
PEAK
V
BAT
=
L
(1)
SLVS775 – JUNE 2007
PRINCIPLES OF OPERATION (continued)
Figure 5. Timing Diagram at One Switching
Figure 6. Timing Diagram at Beginning/Ending
The TPS65562 provides three comparators to control charging. Figure 2 shows the block diagram of TPS65562,
and Figure 5 shows a timing diagram of one switch cycle. Note that emphasis is placed on Time1 and Time3 of
the waveform in Figure 5.
While SW is ON (Time1 to Time2 in Figure 5), U3 monitors current flow through the integrated power switch
from SW pin to GND. When I(SW) exceeds I(PEAK), SW turns OFF (Time2 in Figure 5).
When SW turns OFF (Time2 in Figure 5), the magnetic energy in the transformer starts discharging. Meanwhile,
U2 monitors the kickback voltage at the SW terminal. As the energy is discharging, the kickback voltage is
increasing according to the increase of VO (Time2 to Time3 in Figure 5). When almost all energy is discharged,
the system cannot continue rectification via the diode, and the charging current of IO goes to zero (Times3 in
Figure 5). After rectification stops, the small amount of energy left in the transformer is released via parasitic
paths, and the kickback voltage reaches zero (Time3 to Time4 in Figure 5). During this period, U2 makes SW
turn ON when (V(SW) - VBAT) dips from V(ZERO) (Time5 in Figure 5). In the actual circuit, the period between
Time4 and Time5 in Figure 5 is small or does not appear dependent on the delay time of the U2 detection to SW
ON.
U1 also monitors the kickback voltage. When (V(SW) - VBAT) exceeds V(FULL), the TPS65562 stops charging
(see Figure 6).
In Figure 5 and Figure 6, ON time is always the same period in every switch cycle. The ON time is calculated by
The OFF time is dependant on output voltage. As the output voltage gets higher, the OFF time gets shorter (see
8
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| TPS65563ARGTTG4 | 功能描述:功率驱动器IC Integ Photo Flash Charger & IGBT Drvr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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