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Datasheet

Datasheet

BM1P068FJ

TSZ02201-0F2F0A200190-1-2

24.Oct.2013.Rev.001

© 2013 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

● Description of application operations in blocks

(1)

Start circuit (VH pin: 8 pin)

This IC has a built-in start circuit (withstands 650 V). This enables both low standby mode power and high-speed

startup.

This start circuit operates only at startup. The current flow when operating is shown in Figure 5.

ex) When Vac = 100 V, power consumption is from start circuit only

PVH = 100 V*

√2*10 uA = 1.41 mW

ex) When Vac = 240 V, power consumption is from start circuit only

PVH = 240 V*

√2*10 uA = 3.38 mW

Startup time is determined based on the inflow current for the VH pin and the capacitance for the VCC pin.

When the VCC pin has been shorted by GND, the ISTART1 current in Figure 5 flows.

When the VH pin has been shorted by GND, a large current flows to GND from the VH line. To prevent this, insert resistor

When the VH pin is shorted, the power of VH

to tolerate this amount of power.

If one resistor is not enough for the allowable power, connect two or more resistors in series.

Figure 4. Block Diagram of Start Circuit

0.0 

0.1 

0.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

0.9 

1.0 

0

5

10

15

20

25

30

35

40

45

50

Cvcc  [uF]

Figure 5. Start Current vs VCC Voltage

Figure 6. Startup Time (Reference Value)

(* Start current flows from the VH pin.)

The operating waveform at startup is as follows.