参数资料
型号: IP1206PBF
厂商: International Rectifier
文件页数: 10/30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: 5
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:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 36-BFLGA
包装: 管件
供应商设备封装: 36-LGA(9.25x15.5)

i P1206PbF
Circuit Description
THEORY OF OPERATION
Introduction
The iP1206 is a versatile device for high
performance buck converters. It consists of two
synchronous buck controllers which can be
operated either in a two independent outputs
mode or in a current share single output mode for
high current applications.
The timing of the IC is provided by an internal
oscillator circuit which generates two-180 o -out-of-
phase clock that can be externally programmed
Enable
The enable features another level of flexibility for
start up. The Enable has precise threshold which
is internally monitored by an under-voltage
lockout circuit.
It’s threshold can be externally programmed to
desired level by using two external resistors, so
the converter doesn’t start up until the input
voltage has reached the specified threshold level
(see Fig. 6).
VIN
up to 600kHz per phase.
Under-Voltage Lockout
The under-voltage lockout circuit monitors four
signals (Vcc, Enable, V CH1 , V CH2 ). This ensures
the correct operation of the converter during
power up and power down sequence. The driver
outputs remain in the off state whenever one of
these signals drops below set thresholds. Normal
operation resumes once these signals rise above
the set values. Fig. 6 shows a typical start up
sequence.
12V
11V
12V
7.25V
7.2V
Vbus
Vcc
Vout3
V cc OK
Enable OK (IC's POR)
3V
Enable
SS
Seq
Fig. 6: Normal Start up, Enable threshold is externally set to 11V
Seq pin is pulled high prior to start up
www.irf.com
2/26/2008
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