Datasheet > BD7F200HFN-LBTR

BD7F200HFN-LBTR

更新时间： 2024-01-18 21:25:44

品牌	Logo	应用领域
罗姆 - ROHM		/
页数	文件大小	规格书
31页	1789K
描述
Optocoupler-less Isolated Flyback Converter

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BD7F200HFN-LBTR 数据手册

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BD7F200HFN-LB BD7F200EFJ-LB

Block Diagram

VIN

INTERNAL

REGULATOR

VREF

COMPARATOR

VREF

N-Channel

MOSFET

ADAPTIVE

ON-TIME

Shutdown

DRIVER

Enable

CONTROLLER

SOFT

SDX/EN

START

VIN UVLO

TSD

OCP

Current Monitor

PGND

LOAD

COMPENSATION

REF

AGND

COMP

Description of Blocks

1. INTERNAL REGULATOR

This is the regulator block for internal circuits.

Also includes a reference voltage generating block (VREF).

This block is in the shutdown state when the SDX/EN terminal is below 0.9V (Typ).

2. VIN UVLO

This is the input low-voltage-protection block.

If the power supply input voltage, VIN, falls to below 6.2V (Typ), it will be detected and this block will be in the protection

state and the SW terminal becomes Hi-Z.

When the power supply input voltage (VIN) rises to 6.9V (Typ), it automatically recovers thorough the soft start.

(Hysteresis voltage: 0.7V (Typ).)

3. SOFT START

When the SDX/EN terminal is in the enable state with more than 2.0V (Typ), this block prevents inrush current and

overshoot in the rising of the output voltage by making the reference voltage of the COMPARATOR block rise slowly from

0V to VREF voltage.

The default soft start time, tSS, is designed to be 6ms (Typ) internally.

The min off time is 750ns (Typ) when the output voltage is below 50% of the set voltage.

4. COMPARATOR

This is the block which compares the reference voltage VREF with the REF terminal voltage which is the feedback

voltage of the SW terminal voltage.

Since the feedback loop is structured by a comparator is established, it has excellent response to load fluctuation.

5. ADAPTIVE ON-TIME CONTROLLER

This is the block corresponding to the original adapted type ON-Time control technology.

Switching frequency is fixed at 400kHz (Typ) under PWM Control when the load is stable.

Under On-Time Control, when the load varies, fast load response is enabled by changing the switching frequency.

During light load, the highly efficient PFM will operate and the self-power dissipation is suppressed by decreasing the

switching frequency.

6. DRIVER

This is the block which drives the built-in N-Channel MOSFET.

www.rohm.com

TSZ02201-0J1J0AZ01220-1-2

3/27

TSZ22111・15・001

24.Mar.2016 Rev.002

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