Datasheet > LTM8048

LTM8048

更新时间： 2023-12-20 18:44:05

品牌	Logo	应用领域
亚德诺 - ADI		转换器稳压器
页数	文件大小	规格书
20页	260K
描述
具 LDO 后置稳压器的 3.1VIN 至 32VIN 隔离式 μModule DC/DC 转换器

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中文翻译

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数据手册

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LTM8048 数据手册

LTM8048

PIN FUNCTIONS

–

(Bank 1): V

and V comprise the isolated

BYP (Pin B2): The BYP pin is used to bypass the refer-

OUT1

OUT

output of the LTM8048 flyback stage. Apply an external

ence of the LDO to achieve low noise performance from

–

capacitor between V

to exceed V

and V

. Do not allow V

the linear post regulator. The BYP pin is clamped internally

OUT1

OUT

–

to 0.6V relative to V

. A small capacitor from V

OUT1

OUT

OUT2

to this pin will bypass the reference to lower the output

–

(Bank 2): V

is the return for both V

and

OUT1

OUT

and V

voltage noise. A maximum value of 0.01µF can be used

–

. V

comprise the isolated output of

OUT2 OUT1

OUT

for reducing output voltage noise to a typical 20µV

RMS

the LTM8048. In most applications, the bulk of the heat

over a 100Hz to 100kHz bandwidth. If not used, this pin

–

flow out of the LTM8048 is through the GND and V

OUT

must be left unconnected.

pads, so the printed circuit design has a large impact on

the thermal performance of the part. See the PCB Layout

RUN (Pin F3): A resistive divider connected to V and this

and Thermal Considerations sections for more details.

pin programs the minimum voltage at which the LTM8048

will operate. Below 1.24V, the LTM8048 does not deliver

power to the secondary. Above 1.24V, power will be de-

livered to the secondary and 10µA will be fed into the SS

pin. When RUN is less than 1.24V, the pin draws 2.5µA,

allowing for a programmable hysteresis. Do not allow a

negative voltage (relative to GND) on this pin.

–

Apply an external capacitor between V

and V

OUT1

OUT

(Bank 3): The output of the secondary side linear

OUT2

postregulator.Applytheloadandoutputcapacitorbetween

–

OUT2

andV

.SeetheApplicationsInformationsection

OUT

for more information on output capacitance and reverse

output characteristics.

ADJ1 (Pins G7): Apply a resistor from this pin to GND to

GND (Bank 4): This is the primary side local ground of the

–

set the output voltage V

relative to V

, using the

OUT1

OUT

LTM8048primary.Inmostapplications,thebulkoftheheat

recommended value given in Table 1. If Table 1 does not

–

flow out of the LTM8048 is through the GND and V

OUT

list the desired V

value, the equation

OUT1

pads, so the printed circuit design has a large impact on

the thermal performance of the part. See the PCB Layout

and Thermal Considerations sections for more details.

–0.879

kΩ

)

R_ADJ1= 28.4 V

(

OUT1

may be used to approximate the value. To the seasoned

designer,thisexponentialequationmayseemunusual.The

equation is exponential due to non-linear current sources

that are used to temperature compensate the regulation.

V (Bank 5): V supplies current to the LTM8048’s inter-

nal regulator and to the integrated power switch. These

pins must be locally bypassed with an external, low ESR

capacitor.

BIAS (Pin H5): This pin supplies the power necessary to

operate the LTM8048. It must be locally bypassed with a

low ESR capacitor of at least 4.7μF. Do not allow this pin

ADJ2(pinA2):Thisistheinputtotheerroramplifierofthe

secondary side LDO post regulator. This pin is internally

clamped to 7V. The ADJ2 pin voltage is 1.22V referenced

–

voltage to rise above V .

to V

and the output voltage range is 1.22V to 12V. Ap-

OUT

–

ply a resistor from this pin to V

, using the equation

OUT

SS(PinH6):Placeasoft-startcapacitorheretolimitinrush

current and the output voltage ramp rate. Do not allow a

negative voltage (relative to GND) on this pin.

= 608.78/(V

– 1.22)kΩ. If the post regulator

ADJ2

OUT2

is not used, leave this pin floating.

8048fg

For more information www.linear.com/LTM8048

1...4 5 678 9 10...20

中文翻译

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与LTM8048相关器件

型号	品牌	获取价格	描述	数据表
LTM8048EY#PBF	Linear	获取价格	LTM8048 - 3.1VIN to 32VIN Isolated µModule (Power Module) DC/DC Converter with LD
LTM8048IY#PBF	Linear	获取价格	LTM8048 - 3.1VIN to 32VIN Isolated µModule (Power Module) DC/DC Converter with LD
LTM8048MPY	Linear	获取价格	LTM8048 - 3.1VIN to 32VIN Isolated µModule (Power Module) DC/DC Converter with LD
LTM8048MPY#PBF	Linear	获取价格	LTM8048 - 3.1VIN to 32VIN Isolated µModule (Power Module) DC/DC Converter with LD
LTM8049	Linear Systems	获取价格	Dual SEPIC or Inverting Module DC DC Converter
LTM8049	Linear	获取价格	Dual SEPIC or Inverting Î¼Module DC/DC Conver
LTM8049	ADI	获取价格	双路 SEPIC 或负输出 μModule DC/DC 转换器
LTM8049EY#PBF	Linear	获取价格	LTM8049 - Dual SEPIC or Inverting µModule DC/DC Converter; Package: BGA; Pins: 77
LTM8049EYPBF	Linear Systems	获取价格	Dual SEPIC or Inverting Module DC DC Converter
LTM8049IY#PBF	Linear	获取价格	LTM8049 - Dual SEPIC or Inverting µModule DC/DC Converter; Package: BGA; Pins: 77

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