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參數(shù)資料
| 型號(hào)： | ISL6522BCBZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller |
| 中文描述： | SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁(yè)數(shù)： | 7/15頁(yè) |
| 文件大?。?/td> | 454K |
| 代理商： | ISL6522BCBZ |
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7
Functional Description
Initialization
The ISL6522B automatically initializes upon receipt of
power. Special sequencing of the input supplies is not
necessary. The Power-On Reset (POR) function continually
monitors the input supply voltages and the enable (EN) pin.
The POR monitors the bias voltage at the VCC pin and the
input voltage (V
IN
) on the OCSET pin. The level on OCSET
is equal to V
IN
Less a fixed voltage drop (see overcurrent
protection). With the EN pin held to V
CC
, the POR function
initiates soft-start operation after both input supply voltages
exceed their POR thresholds. For operation with a single
+12V power source, V
IN
and V
CC
are equivalent and the
+12V power source must exceed the rising V
CC
threshold
before POR initiates operation.
The POR function inhibits operation with the chip disabled
(EN pin low). With both input supplies above their POR
thresholds, transitioning the EN pin high initiates a soft-start
interval.
Soft-Start
The POR function initiates the soft-start sequence. An
internal 10
μ
A current source charges an external capacitor
(C
SS
) on the SS pin to 4V. Soft-start clamps the error
amplifier output (COMP pin) to the SS pin voltage. Figure 3
shows the soft-start interval. At t
1
in Figure 3, the SS and
COMP voltages reach the valley of the oscillator’s triangle
wave. The oscillator’s triangular waveform is compared to
the ramping error amplifier voltage. This generates PHASE
pulses of increasing width that charge the output
capacitor(s). This interval of increasing pulse width
continues to t2, at which point the output is in regulation and
the clamp on the COMP pin is released. This method
provides a rapid and controlled output voltage rise.
During Soft-Start, the ISL6522B controls the regulator in a
standard buck fashion. The lower MOSFET is not enabled
during soft-start. The body diode of the MOSFET or the
external diode, if used, will conduct when the upper
MOSFET is OFF. Once the output has reached regulation,
the lower MOSFET is enabled and the regulator is controlled
as a synchronous buck regulator. This allows the ISL6522B
regulator to start into a pre-biased output.
During Soft Start, the ISL6522B functions as a standard buck
converter by disabling the lower MOSFET. This is done by
holding the LGATE pin LOW. If there is not a diode in parallel
with the lower MOSFET, the body diode of the lower
MOSFET will conduct when the upper MOSFET is off. Once
the SS pin has reached it’s peak value, the lower MOSFET
is enabled and the ISL6522B functions as a synchronous
buck converter.
FIGURE 3. SOFT-START INTERVAL
VOLTAGE
TIME
V
OSC(MIN)
t
0
t
1
t
2
CLAMP ON V
COMP
RELEASED AT STEADY STATE
V
COMP
V
SOFT START
V
OUT
t
1
C
SS
-----------
V
OSC MIN
(
)
=
t
SoftStart
t
2
t
1
–
C
SS
-----------
V
IN
------------------------------------------------
V
OSC
=
=
Where:
C
SS
= Soft Start Capacitor
I
SS
= Soft Start Current = 10
μ
A
V
OSC(MIN)
= Bottom of Oscillator = 1.35V
V
IN
= Input Voltage
V
OSC
= Peak to Peak Oscillator Voltage = 1.9V
V
OUTSteadyState
= Steady State Output Voltage
O
S
0A
0V
TIME (20ms/DIV)
5A
10A
15A
2V
4V
FIGURE 4. OVERCURRENT OPERATION
ISL6522B
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ISL6522BCBZ-T | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6522BCR | 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6522BCRR5190 | 制造商:Intersil Corporation 功能描述: |
| ISL6522BCR-T | 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6522BCRZ | 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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