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參數(shù)資料
| 型號： | IR3623MPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| 中文描述： | 高頻2相，單或雙輸出同步降壓控制器，輸出跟蹤和排序 |
| 文件頁數(shù)： | 16/26頁 |
| 文件大?。?/td> | 523K |
| 代理商： | IR3623MPBF |
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IR3623MPbF
www.irf.com
16
Ph_En and Pre-Bias
For a correct start up the driver section needs to
be powered up before the PWM signal is applied.
IR3623 features a dedicated pin (Ph_En) which
can be used for this purposes. Figure 22 shows
how this pin is used to enable IP2003A. During
normal start up the PWM is in Tri-state mode
until the Ph_En goes high, each channel has own
Ph_En pins.
During the Pre-Bias start up the Ph_En is kept
low and the PWM output is in Tri-state mode.
The Ph_En will be enabled as soon as the
internal PWM signal is generated.
Over Voltage Protection
Over-voltage is sensed through two dedicated
sense pins V
SEN1
, V
SEN2
. A separate OVP circuit
is provided for each channel.
The OVP threshold is user programmable and
can be set by two external resistors. Upon over-
voltage condition of either one of the outputs, the
OVP forces a latched shutdown on the fault
output and pulls low the PWM signal.
IR3623 features an OVP output signal, high
status of this pin indicates the OVP event for
either of the channels. This pin has 10mA current
capability which can be used to drive an external
switch.
Reset is performed by recycling the Vcc or
Enable.
Power Good
The IR3623 provides two separate open collector
power good signals which report the status of the
outputs. The outputs are sensed through the two
dedicated V
SEN1
and V
SEN2
pins.
Once the IR3623 is enabled and the outputs
reach the set value (90% of set value) the power
good signals go open and stay open as long as
the outputs stay within the set values.
These pins need to be externally pulled high.
Shutdown using Soft Start pins
The outputs can be shutdown by pulling the soft-
start pin below 0.3V. This can be easily done by
using an external small signal transistor. During
shutdown both MOSFET drivers will be turned
off. Normal operation will resume by cycling soft
start pin.
Switching Frequency vs R
T
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
0
25
50
75
100
125
150
175
200
225
R
T
(kOhm)
F
Fig. 16: Switching Frequency vs. External Resistor (R
t
)
Operating Frequency Selection
The switching frequency is determined by
connecting an external resistor (Rt) to ground.
Figure 16 provides a graph of oscillator
frequency
versus
Rt.
recommended channel frequency is 1.2MHz.
The
maximum
Frequency Synchronization
The IR3623 is capable of accepting an external
digital synchronization signal. Synchronization
will be enabled by the rising edge at an external
clock. Per –channel switching frequency is set
by external resistor (Rt). The free running
frequency oscillator frequency is twice the per-
channel frequency. During synchronization, Rt is
selected such that the free running frequency is
20% below the synchronization frequency.
Synchronization capability is provided for both
single output current share mode and dual
output configuration. When unused, the sync
pin will remain floating and is noise immune.
Thermal Shutdown
Temperature sensing is provided inside IR3623.
The trip threshold is typically set to 135
o
C.
When trip threshold is exceeded, thermal
shutdown turns off both MOSFETs. Thermal
shutdown is not latched and automatic restart is
initiated when the sensed temperature drops to
normal range. There is a 20
o
C hysteresis in the
shutdown threshold.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| IR3623MPBF_1 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3623MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3624MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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