Datasheet > BD7J200HFN-LB

BD7J200HFN-LB

更新时间： 2023-09-03 20:25:15

品牌	Logo	应用领域
罗姆 - ROHM		变压器光电转换器
页数	文件大小	规格书
41页	1557K
描述
本产品是面向工业设备市场的产品，保证可长期稳定供货。适合用于工业设备的绝缘电源。本产品是无需光电耦合器的绝缘型反激式转换器。无需以往用途中为获得稳定输出电压所需的光电耦合器、变压器3次绕组构成的反馈电路。还采用了独创的适应型导通时间控制技术，不需要外接相位补偿部件，可大幅减少部件个数，并实现小型、高可靠性的绝缘型电源应用设计。

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BD7J200HFN-LB 数据手册

BD7J200HFN-LB BD7J200EFJ-LB BD7J200UEFJ-LB

Description of Blocks – continued

VIN UVLO

This is the input low voltage protection block.

When the VIN pin voltage becomes V_UVLO1or less, the IC detects VIN UVLO and stops the switching operation because

of the high impedance in the SW pin.

When the VIN pin voltage becomes V_UVLO2or more, the IC automatically reset via the soft start.

VIN pin voltage

V_UVLO2

V_UVLO1

0 V

t_SS

Setting output voltage

Setting output voltage × 0.9

Output voltage

Switching

Figure 2. VIN UVLO Timing Chart

SOFT START

When the status becomes enable that the SDX/EN pin voltage V_EN1or more, the comparison voltage in the comparator

block transits slowly 0 V to V_INTREFThis operation pretend the IC from rushing current at the rising edge of the output

voltage or overshooting. The soft start time is fixed to t_SSin the IC.

COMPARATOR

In this block, the IC compare the reference voltage to the REF pin voltage that is the feedback voltage of the SW pin

voltage. This IC is superior to the response for fluctuation in load because it constitutes the feedback group by the

comparator.

ADAPTIVE ON TIME CONTROLLER

This block is corresponded to the original adapted type technology that controls on time.

Stable load current:

Operates in the PWM control and fix the on time.

Fluctuating load current:

Operates in the on time control and realizes a high-speed load response by

fluctuates the switching frequency.

Light load:

Decrease the switching frequency and realizes a high efficiency.

When the load current fluctuates, the frequency becomes high. The IC raises the average of primary current by

shortening the off time and raises the secondary current.

Output voltage

Primary coil current

SW pin voltage

High

Frequency

Stabilize gradually

Stable operation

Switching Frequency

Figure 3. Transient Response Timing Chart

www.rohm.com

TSZ22111 • 15 • 001

TSZ02201-0F1F0BZ00010-1-2

20.Mar.2023 Rev.002

4/38

1 2 345 6 7...41

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