Datasheet > H3842

H3842

更新时间： 2024-11-23 22:33:03

品牌	Logo	应用领域
HSMC		/
页数	文件大小	规格书
10页	157K
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HIGH PERFORMANCE CURRENT MODE CONTROLERS

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数据手册

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H3842 数据手册

Spec. No. : HP200202

Issued Date : 1998.08.01

Revised Date : 2002.12.03

Page No. : 1/10

HI-SINCERITY

MICROELECTRONICS CORP.

H3842P / HSMC3842

HIGH PERFORMANCE CURRENT MODE CONTROLERS

Description

The H3842P/HSMC3842 are high performance fixed frequency current mode

controllers. They are specifically designed for Off-Line and DC To DC converter

applications offering the designer a cost-effective solution with minimal external

components. These integrated circuits feature a trimmed oscillator for precise duty

cycle control. A temperature compensa-ted reference, high gain error amplifier,

current sensing comparator, and a high current totem pole output ideally suited for

DIP-8Pin

driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage

lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single

pulse metering.

Features

• Trimmed Oscillator for Precise Frequency Control

• Oscillator Frequency Guaranteed at 250 kHz

• Current Mode Operation to 500 kHz

• Automatic Feed Forward Compensation

• Latching PWM for Cycle-By-Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

Absolute Maximum Ratings

Symbol

Parameter

Supply Voltage (low impedance source)

Supply Voltage (Ii<30mA)

Value

Unit

Self Limiting

±1

Output Current

Output Energy (capacitive load)

Analog Inputs (pin 2, 3)

-0.3 to 5.5

Error Amplifier Output Sink Current

Power Dissipation at Tamb≤25^oC

Storage Temperature Range

Junction Operating Temperature

Lead Temperature (soldering 10s)

Ptot

Tstg

1.25

-65 to 150

-40 to 150

300

^oC

Block Diagram

Vcc

UVLO

34V

VREF

S/R

REF

5V 50mA

Ground

RT/CT

Internal

Bias

2.50V

VREF Good

Logic

Output

OSC

Error AMP.

PWM Latch

VFB

Current

Sense

Comparator

COMP

Current

Sense

H3842P

HSMC Product Specification

12 3 4 5 6 7...10

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