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参数资料
| 型号： | IRPP3624-12A |
| 厂商： | International Rectifier |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | KIT REF DES 12A 1PH SYNC BUCK |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | POWIR+™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 12A |
| 输入电压： | 10.8 ~ 13.2 V |
| 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： | 板 |
| 已用 IC / 零件： | IR3624，IRF7823，IRF7832Z |
| 相关产品： | IR3624MPBF-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFCT-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IRF7832ZTR-ND - MOSFET N-CH 30V 21A 8-SOIC IRF7832Z-ND - MOSFET N-CH 30V 21A 8-SOIC |
IR3624MPBF
Over-Current Protection
28uA
The over current protection is performed by
sensing current through the R DS(on) of low side
MOSFET. This method enhances the converter’s
20uA
OCP
efficiency and reduce cost by eliminating a
current sense resistor. As shown in figure 7, an
external resistor (R SET ) is connected between
OCSet pin and the drain of low side MOSFET
(Q2) which sets the current limit set point.
SS1 / SD
20
3uA
The internal current source develops a voltage
across R SET . When the low side MOSFET is
turned on, the inductor current flows through the
Q2 and results a voltage which is given by:
Fig. 8: 3uA current source for discharging
soft-start capacitor during hiccup
The OCP circuit starts sampling current when the
V OCSet = (I OCSet ? R OCSet ) ? (R DS(on) ? I L )
--( 2 )
low gate drive is about 3V. The OCSet pin is
internally clamped during deadtime to prevent
false trigging, figure 9 shows the OCSet pin
during one switching cycle. As it is shown there
IR3624
I OCSET
OCSet R SET
Q1
L1
V OUT
is about 150ns delay to mask the deadtime, since
this node contains switching noises, this delay
also functions as a filter.
Hiccup
Q2
Control
Fig. 7: Connection of over current sensing resistor
Deadtime
The critical inductor current can be calculated by
setting:
V OCSet = (I OCSet ? R OCSet ) ? (R DS(on) ? I L ) = 0
R OCSet ? I OCSet
I SET = I L ( critical ) =
--( 3 )
R DS ( on )
I OCSet *R OCSet
Blanking time
Clamp voltage
An over current is detected if the OCSet pin goes
below ground. This trips the OCP comparator
and cycles the soft start function in hiccup mode.
The hiccup is performed by charging and
discharging the soft-start capacitor in certain
slope rate. As shown in figure 8 a 3uA current
source is used to discharge the soft-start
capacitor.
The OCP comparator resets after every soft start
Fig. 9: OCset pin during normal condition
Ch1: Inductor point, Ch2:Ldrv, Ch3:OCSet
The value of R SET should be checked in an actual
circuit to ensure that the over current protection
circuit activates as expected. The IR3624 current
limit is designed primarily as disaster preventing,
"no blow up" circuit, and doesn't operate as a
precision current regulator.
cycles, the converter stays in this mode until the
overload or short circuit is removed. The
converter will automatically recover.
10
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