参数资料
型号: IRDC3838
厂商: International Rectifier
文件页数: 17/35页
文件大小: 0K
描述: KIT EVAL REG 10A SUPIRBUCK DC/DC
标准包装: 1
系列: SupIRBuck™
主要目的: DC/DC,LDO 步降
输出及类型: 1,非隔离
输出电压: 1.8V
电流 - 输出: 10A
输入电压: 12V
稳压器拓扑结构: 降压
频率 - 开关: 600kHz
板类型: 完全填充
已供物品:
已用 IC / 零件: IR3838
IR3838MPbF
Power Good Output
The IC continually monitors the output voltage via
Feedback (Fb pin). The feedback voltage is
compared to a threshold. The threshold is set
differently at different operating modes and the
results of the comparison sets the PGood signal.
Figures 11, 12, and 13 show the timing diagram
of the PGood signal at different operating modes.
The PGood pin is open drain and it needs to be
externally pulled high. High state indicates that
output is in regulation.
Table 2. The required conditions to achieve simultaneous / ratiometric tracking and sequencing
operations with the circuit configuration of Fig. 8
Operating Mode
Normal (Non-Sequencing,
Vref (slave)
0.6V (Float)
Vp
> 1.5V
Required Condition
-
Non-Tracking)
Simultaneous Sequencing
Ratiometric Sequencing
Simultaneous Tracking
Ratiometric Tracking
0.6V
0.6V
> 1.5V
> 1.5V
Ramp up from 0V
Ramp up from 0V
Ramp up from 0V
Ramp up from 0V
R A /R B > R E /R F =R C /R D
R A /R B >R E /R F > R C /R D
R E /R F =R C /R D
R E /R F >R C /R D
TIMING DIAGRAM OF PGOOD FUNCTIONS
Vref
0
0.6V
1.3V
2.0V
0.7V
SSOK
Internal SS
0
1.15*Vref
Fb
0
PGood
0
0.85*Vref
256/Fs
256/Fs
Fig.11 Non-sequence Startup and Vref Margin (Vp =Vcc)
Rev 1.41
17
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