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| 型號(hào)： | ISL9305IRTHWLNCZ-T |
| 廠(chǎng)商： | Intersil |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 661K |
| 描述： | IC REG QD BUCK/LINEAR 16TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Patient Monitoring and Diagnostic Equipment Solutions |
| 標(biāo)準(zhǔn)包裝： | 6,000 |
| 拓?fù)洌?/td> | 降壓（降壓）（2），線(xiàn)性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 4 |
| 頻率 - 開(kāi)關(guān)： | 3MHz |
| 電壓/電流 - 輸出 1： | 0.8 V ~ 5.5 V，800mA |
| 電壓/電流 - 輸出 2： | 0.8 V ~ 5.5 V，800mA |
| 電壓/電流 - 輸出 3： | 0.9 V ~ 3.3 V，350mA |
| 帶 LED 驅(qū)動(dòng)器： | 無(wú) |
| 帶監(jiān)控器： | 無(wú) |
| 帶序列發(fā)生器： | 無(wú) |
| 電源電壓： | 1.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
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ISL9305H
7
FN7724.1
October 5, 2011
Theory of Operation
DCD1 and DCD2 Introduction
Both the DCD1 and DCD2 converters on ISL9305H use the
peak-current-mode pulse-width modulation (PWM) control scheme
for fast transient response and pulse-by-pulse current limiting.
Both converters are able to supply up to 1.5A load current. The
default output voltage ranges from 0.8V to 3.6V depending on the
factory pre-set configuration and can be programmed via the I
2
C
interface in the range of 0.825V to 3.6V at 25mV/step with a
programmable slew rate. An open-drain DCDPG (DCD Power-Good)
signal is also provided to monitor the DCD1 and DCD2 output
voltages. Optionally, both DCD1 and DCD2 can be programmed to
be actively discharged via an on-chip bleeding resistor (typical
115&) when the converter is disabled.
Skip Mode (PFM Mode) for DCD1/DCD2
Under light load condition, the DCD1 and DCD2 can be programmed
to automatically enter a pulse-skipping mode to minimize the
switching loss by reducing the switching frequency. Figure 3
illustrates the skip mode operation. A zero-cross sensing circuit
monitors the current flowing through SW node for zero crossing.
When it is detected to cross zero for 16 consecutive cycles, the
regulator enters the skip mode. During the 16 consecutive cycles,
the inductor current could be negative. The counter is reset to zero
when the sensed current flowing through SW node does not cross
zero during any cycle within the 16 consecutive cycles. Once the
converter enters the skip mode, the pulse modulation is controlled
by an internal comparator while each pulse cycle remains
synchronized to the PWM clock. The P-Channel MOSFET is turned on
at the rising edge of the clock and turned off when its current
reaches ~20% of the peak current limit. As the average inductor
current in each cycle is higher than the average current of the load,
the output voltage rises cycle-over-cycle. When the output voltage is
sensed to reach 1.5% above its nominal voltage, the P-Channel
MOSFET is turned off immediately and the inductor current is fully
discharged to zero and stays at zero. The output voltage reduces
gradually due to the load current discharging the output capacitor.
When the output voltage drops to the nominal voltage, the P-
Channel MOSFET will be turned on again, repeating the previous
operations.
The regulator resumes normal PWM mode operation when the
output voltage is sensed to drop below 1.5% of its nominal
voltage value.
Soft-Start
The soft-start reduces the in-rush current during the start-up stage.
The soft-start block limits the current rising speed so that the
output voltage rises in a controlled fashion.
Overcurrent Protection
The overcurrent protection for DCD1 and DCD2 is provided on
ISL9305H for when an overload condition occurs. When the current
at P-Channel MOSFET is sensed to reach the current limit, the
internal protection circuit is triggered to turn off the P-Channel
MOSFET immediately.
DCD Short-Circuit Protection
The ISL9305H provides Short-Circuit Protection for both DCD1 and
DCD2. The feedback voltage is monitored for output short-circuit
protection. When the output voltage is sensed to be lower than a
certain threshold, the internal circuit will change the PWM oscillator
frequency to a lower frequencies in order to protect the IC from
damage. The P-Channel MOSFET peak current limit remains active
during this state.
FIGURE 2. PWM OPERATION WAVEFORMS
v
EAMP
d
i
L
v
OUT
v
CSA
FIGURE 3. SKIP MODE OPERATION WAVEFORMS
16 CYCLES
CLOCK
I
L
V
OUT
0
V
OUT_NOMINAL
20% PEAK CURRENT LIMIT
1.015*V
OUT_NOMINAL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL9305IRTWBNLZ-T | 功能描述:電流型 PWM 控制器 DL DC/DC & DLLDO /1 8/1 2/3 TQFN L16 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL9305IRTWCLBZ-T | 功能描述:電流型 PWM 控制器 DL DC/DC & DLLDO /1 8/1 2/3 TQFN L16 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL9305IRTWCNLZ-T | 功能描述:電流型 PWM 控制器 DL DC/DC & DLLDO /1 8/1 2/3 TQFN L16 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL9305IRTWCNYZ-T | 功能描述:電流型 PWM 控制器 DL DC/DC & DLLDO /1 8/1 2/3 TQFN L16 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL9305IRTWLNCZ-T | 功能描述:電流型 PWM 控制器 DL DC/DC & DLLDO /1 8/1 2/3 TQFN L16 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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