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参数资料
| 型号： | IP1206TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A/15A LGA |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 750 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 或 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 7.5 V ~ 14.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 30A，15A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BFLGA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 36-LGA（9.25x15.5） |
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i P1206PbF
Current Share Mode
This feature allows the connection of both outputs
V in
Master Phase
IL1
together to increase current handling capability of
L1
R L1
the converter to support a common load. In current
sharing mode, error amplifier 1 becomes the master
Q2
+
R1
V L1 (s) -
C1
which regulates the common output voltage and the
error amplifier 2 performs the current sharing
+ V C1 (s) -
function, Fig. 9 shows the configuration of error
amplifiers. See Fig 25a for a typical application.
In this mode iP1206 makes sure the master channel
starts first followed by slave channel to prevent any
glitch during start up. This is done by clamping the
VP2
FB2
V OUT
output of slave’s error amplifier until the master
channel generates the first PWM signal.
At no load condition the slave channel may be kept
V in
Q3
R2
C2
off depending on the offset of error amplifier.
Q4
L2
R L2
V RL 1 ( s ) = ( V in ? V out ) *
R L 1
If : R 1 1 =
L 1
Lossless Inductor Current Sensing
The iP1206 uses a lossless current sensing
technique for current share purposes. The inductor
current is sensed by connecting a series resistor
and a capacitor network in parallel with the inductor
and measuring the voltage across the capacitor,
this voltage is proportional to the inductor current.
As shown in Fig. 9 the voltage across the inductor’s
DCR can be expressed by:
- - - - ( 1 )
R L 1 + sL 1
Slave Phase
Fig. 9: Loss Less inductor current sensing
and current sharing
the sense circuit can be treated as if only a sense
resistor with the value R L1 was used.
* C
R L 1
V C ( s ) ≈ I L 1 * R L 1
V RL 1 ( s ) = I L 1 * R L 1
- - - - ( 2 )
The mismatch of the time constants does not
affect the measurements of inductor DC current,
The voltage across the C 1 can expressed by:
but affects the AC component of the inductor
current.
R 1 + 1
V C 1 ( s ) = ( V in ? V out ) *
1
sC 1
sC 1
- - - - ( 3 )
Soft-Start
The iP1206 has a programmable soft-start to
control the output voltage rise and limit the inrush
Combining equations (1),(2) and (3) result in the
following expression for V C1 :
current during start-up. It provides a separate
Soft-start function for each output. This enables
the user to sequence the outputs by controlling
V C 1 ( s ) = I L 1 *
R L 1 + sL 1
1 + sR 1 * C 1
- - - - ( 4 )
the rise time of each output through the selection
of different value soft-start capacitors.
To ensure correct start-up, the soft-start
constants match, the voltage across C 1
Usually the resistor R 1 and C 1 are chosen so that
the time constant of R 1 and C 1 equals the time
constant of the inductor which is the inductance L 1
over the inductor’s DCR (R L1 ). If the two time
is
proportional to the current through L 1 , and
sequence initiates when the Vcc and Enable rise
above their threshold and generate the Power On
Reset (POR) signal. Soft-start function operates
by sourcing an internal current to charge an
external capacitor to about 3V. Initially, the soft-
start function clamps the error amplifier’s output
of the PWM converter.
www.irf.com
2/26/2008
12
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