Datasheet > SG3845

SG3845

更新时间： 2023-12-06 20:03:00

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
19页	756K
描述
The SG1844/45 family of control ICs provides all the required features to implement off-line Fixed

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SG3845 数据手册

SG1844/SG1845/SG3844/SG3845

Current Mode PWM Controller

Features

Description

Optimized for Off-Line Control

The SG1844/45 family of control ICs provides all the

required features to implement off-line Fixed

Frequency, Current-mode switching power supplies

with a minimum number of external components.

Current-mode architecture demonstrates improved line

regulation, improved load regulation, pulse-by pulse

current limiting and inherent protection of the power

supply output switch.

Low Start-Up Current (<1mA)

Automatic Feed Forward Compensation

Trimmed Oscillator

Discharge Current

Pulse-By-Pulse Current Limiting

Enhanced Load Response Characteristics

Undervoltage Lockout with 6V Hysteresis

(SG1844 only)

The Bandgap reference is trimmed to ±1% over

temperature. Oscillator discharge current is trimmed to

less than ±10%. The SG1844/45 has under-voltage

lockout, current-limiting circuitry and start-up current of

less than 1mA. The totem-pole output is optimized to

drive the gate of a power MOSFET. The output is low

in the off state to provide direct interface to an N-

channel device. Both operate up to a maximum duty

cycle range of zero to <50% due to an internal toggle

flip-flop which blanks the output off every other clock

cycle. The SG1844/45 is specified for operation over

the full military ambient temperature range of -55°C to

125°C. The SG3844/45 is designed for the commercial

range of 0°C to 70°C.

Double Pulse Suppression

High-Current Totem-Pole Output

Internally Trimmed Bandgap Reference

500kHz Operation

Under-voltage Lockout

SG1844 - 16 Volts

SG1845 - 8.4 Volts

Low Shoot-through Current <75mA Over

Temperature

Application

. Available to MIL-STD-883

. Available to DSCC

– Standard Microcircuit Drawing (SMD)

. SGR1844/45 Rad-Tolerant Version Available

Product Highlight

R_ST

I_ST

INPUT

V_cc

SG3844

Figure 1 · Product Highlight

November 2014 Rev. 1.7

www.microsemi.com

12 3 4 5 6 7...19

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与SG3845相关器件

型号	品牌	获取价格	描述	数据表
SG3845D	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3845DM	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3845DM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8, ROHS CO
SG3845DT	MICROSEMI	获取价格	暂无描述
SG3845D-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, ROHS C
SG3845J	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3845M	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3845M-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, PDIP8, DIP-8
SG3845N	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3845Y	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER