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參數(shù)資料
| 型號： | ISL6526IRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RX-1M Hi-Meg Resistor, Ultra-high resistance, High stability, Hermetically Sealed, 0.5 W Rating |
| 中文描述： | 2 A SWITCHING CONTROLLER, 340 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220-VHHB, QFN-16 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 420K |
| 代理商： | ISL6526IRZ-T |
9
such as to other distributed loads on the rail or through a
voltage limiting protection device, the capacitance on this rail
will absorb the current. This situation will allow the voltage
level of the input rail to increase. If the voltage level of the rail
is boosted to a level that exceeds the maximum voltage
rating of any components attached to the input rail, then
those components may experience an irreversible failure or
experience stress that may shorten their lifespan. Ensuring
that there is a path for the current to flow other than the
capacitance on the rail will prevent this failure mode.
Application Guidelines
Layout Considerations
Layout is very important in high frequency switching
converter design. With power devices switching efficiently at
300kHz or 600kHz, the resulting current transitions from one
device to another causing voltage spikes across the
interconnecting impedances and parasitic circuit elements.
These voltage spikes can degrade efficiency, radiate noise
into the circuit, and lead to device overvoltage stress.
Careful component layout and printed circuit board design
minimizes the voltage spikes in the converters.
As an example, consider the turn-off transition of the PWM
MOSFET. Prior to turn-off, the MOSFET is carrying the full load
current. During turn-off, current stops flowing in the MOSFET
and is picked up by the lower MOSFET. Any parasitic
inductance in the switched current path generates a large
voltage spike during the switching interval. Careful component
selection, tight layout of the critical components, and short, wide
traces minimizes the magnitude of voltage spikes.
There are two sets of critical components in a DC-DC
converter using the ISL6526. The switching components are
the most critical because they switch large amounts of
energy, and therefore tend to generate large amounts of
noise. Next are the small signal components which connect
to sensitive nodes or supply critical bypass current and
signal coupling.
A multi-layer printed circuit board is recommended. Figure 4
shows the connections of the critical components in the
converter. Note that capacitors C
IN
and C
OUT
could each
represent numerous physical capacitors. Dedicate one solid
layer, usually a middle layer of the PC board, for a ground
plane and make all critical component ground connections
with vias to this layer. Dedicate another solid layer as a
power plane and break this plane into smaller islands of
common voltage levels. Keep the metal runs from the
PHASE terminals to the output inductor short. The power
plane should support the input power and output power
nodes. Use copper filled polygons on the top and bottom
circuit layers for the phase nodes. Use the remaining printed
circuit layers for small signal wiring. The wiring traces from
the GATE pins to the MOSFET gates should be kept short
and wide enough to easily handle the 1A of drive current.
The switching components should be placed close to the
ISL6526 first. Minimize the length of the connections between
the input capacitors, C
IN
, and the power switches by placing
them nearby. Position both the ceramic and bulk input
capacitors as close to the upper MOSFET drain as possible.
Position the output inductor and output capacitors between the
upper MOSFET and lower MOSFET and the load.
The critical small signal components include any bypass
capacitors, feedback components, and compensation
components. Position the bypass capacitor, C
BP
, close to
the VCC pin with a via directly to the ground plane. Place the
PWM converter compensation components close to the FB
and COMP pins. The feedback resistors for both regulators
should also be located as close as possible to the relevant
FB pin with vias tied straight to the ground plane as required.
Feedback Compensation
Figure 5 highlights the voltage-mode control loop for a
synchronous-rectified buck converter. The output voltage
(V
OUT
) is regulated to the Reference voltage level. The
error amplifier (Error Amp) output (V
E/A
) is compared with
the oscillator (OSC) triangular wave to provide a pulse-
V
OUT
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
L
OUT
C
OUT
C
IN
+3.3V V
IN
KEY
COMP
ISL6526
UGATE
R4
R
2
C
BP
FB
GND
CPVOUT
FIGURE 4. PRINTED CIRCUIT BOARD POWER PLANES
AND ISLANDS
R
1
BOOT
C
2
VIA CONNECTION TO GROUND PLANE
L
Q1
C
BOOT
PHASE
D1
R
3
C
3
C
1
Q2
LGATE
PHASE
VCC
C
VCC
ISL6526
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6526CR-T | Single Synchronous Buck Pulse-Width Modulation (PWM) Controller |
| ISL6526EVAL1 | Single Synchronous Buck Pulse-Width Modulation (PWM) Controller |
| ISL6526EVAL2 | Single Synchronous Buck Pulse-Width Modulation (PWM) Controller |
| ISL6526IRZ | MINIATURE TOGGLE SWITCH |
| ISL6526 | Adjustable Precision Shunt Regulator 5-SOT-23 -40 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6526IRZ-TK | 功能描述:IC REG CTRLR BUCK 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 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 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) |
| ISL6527ACB | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC 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 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) |
| ISL6527ACB-T | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC 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 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) |
| ISL6527ACBZ | 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 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 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) |
| ISL6527ACBZA | 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:- 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 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) |
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