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| 型號(hào)： | LTC1530IS8-2.5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 23/24頁(yè) |
| 文件大?。?/td> | 301K |
| 代理商： | LTC1530IS8-2.5#PBF |
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8
LTC1530
1530fa
G1 RISE/FALL
3300pF
+
0.1
F
10
F
1530 F04a
PVCC
IFB
PVCC
12V
GND
G1
G2
G2 RISE/FALL
VOUT
COMP
LTC1530
3300pF
90%
tr
tNOL
tf
50%
COMP
G1
1530 F04b
tSS
10%
Figure 4
OVERVIEW
The LTC1530 is a voltage feedback, synchronous switch-
ing regulator controller (see Block Diagram) designed for
use in high power, low voltage step-down (buck) convert-
ers. It includes an on-chip soft-start capacitor, a PWM
generator, a precision reference trimmed to
±1%,twohigh
power MOSFET gate drivers and all the necessary feed-
back and control circuitry to form a complete switching
regulator circuit running at 300kHz.
The LTC1530 includes a current limit sensing circuit that
uses the topside external N-channel power MOSFET as a
current sensing element, eliminating the need for an
external sense resistor. If the current comparator, CC,
detects an overcurrent condition, the duty cycle is reduced
by discharging the internal soft-start capacitor through a
voltage-controlled current source. Under severe over-
loads or output short-circuit conditions, the soft-start
capacitor is pulled to ground and a start-up cycle is
initiated. If the short circuit or overload persists, the chip
repeats soft-start cycles and prevents damage to external
components.
THEORY OF OPERATION
Primary Feedback Loop
The LTC1530 compares the output voltage with the inter-
nal reference at the error amplifier inputs. The error
amplifier outputs an error signal to the PWM comparator.
This signal is compared to the fixed frequency oscillator
sawtooth waveform to generate the PWM signal. The
PWM signal drives the external MOSFETs at the G1 and G2
pins. The resulting chopped waveform is filtered by LO and
COUT which closes the loop. Loop frequency compensa-
tion is typically accomplished with an external RC + C
network at the COMP pin, which is the output node of the
transconductance error amplifier.
MIN, MAX Feedback Loops
Two additional comparators in the feedback loop provide
high speed fault correction in situations where the error
amplifier cannot respond quickly enough. MIN compares
the feedback signal to a voltage 3% below the internal
reference. If the signal is below the comparator threshold,
the MIN comparator overrides the error amplifier and
forces the loop to maximum duty cycle, typically 86%.
Similarly, the MAX comparator forces the output to 0%
duty cycle if the feedback signal is greater than 3% above
the internal reference. To prevent these two comparators
from triggering due to noise, the MIN and MAX compara-
tors’ response times are deliberately delayed by two to
three microseconds. These comparators help prevent
extreme output perturbations with fast output load current
transients, while allowing the main feedback loop to be
optimally compensated for stability.
Thermal Shutdown
The LTC1530 has a thermal protection circuit that disables
both internal gate drivers if activated. G1 and G2 are held
low and the LTC1530 supply current drops to about 1mA.
TEST CIRCUITS
APPLICATIO S I FOR ATIO
WU
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1530IS8-3.3 | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#PBF | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#TRPBF | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8PBF | 制造商:Linear Technology 功能描述:DC-DC Controller Sync Buck 3.5-7V SOIC8 |
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