445547

Daewoo DSJ5520 Manual

18
Zoom out
Zoom in
Previous page
1/97
Next page
17
Explanation for circuit operation
Specifications
ITEM Terminal Symbol
MIN TYP MAX
Unit
Voltage via drain-source 1 - 2 VDSS 650 - - V
Drain leakage current 1 - 2IDSS - - 300
ON resistance 1 - 2 RDS(ON) - - 3.90 OHM
Heat resistance - ch-F - - 1.63 C/W
Switching time 1 - 2 Tf - - 250
SEC
<Electrical features of MOSFET(Ta=25 >
4) Explanation for operation
When the VIN terminal (Pin No.4) voltage of STR-F6656, which is charged in C815 and C822
via starting resistance (R809+R817) and (R823+R824) at the early starting, reaches 10V, a
control circuit in SRT-F6656 starts.
Since the circuit current before 6656 operation is limited to 400 (MAX), a high starting
resistance can be used.
Because a sustaining current of latch circuit in 6656 is set to 500 (MAX), this starting
resistance needs to be set so that 500 or more current flows though AC input power is the
lowest.
Because the time until control circuit in 6656 starts is determined after AC input voltage is
input by (R809+R817), (R823+R824) and C815, C822 product, the power start gets slow if
C815 and C822 is set too high.
The voltage via a coil D (d1) of trans (T802. T803) is rectified and smoothed after operation
of 6656 and a stable voltage is supplied for Vin terminal. For coil D1, approx. 15.5V voltage is
rectified and smoothed via R813, R818, D810, D813, C815 and C822 and approx. 15V
voltage is supplied for Vin terminal of 6656.
Since VIN (OFF) voltage is set to 10V (TYP) in 6656, the terminal voltage supplied for Vin
terminal should not be less than 10V (15V at present). The voltage of coil d1 should be set
over operation stop voltage (VIN(OFF)=10V(MAX)) and under OVP operation voltage
(VOVP=16V(MIN)) at normal operating state.
5) Protection circuit
5-1) OCP circuit
This is an overcurrent protection circuit of pulse by pulse type that the peak of MOSFET
drain current is detected by 1 pulse and the output of oscillator is reversed.
To detect the MOSFET drain current, R810 and R820 are connected between source
terminal (Pin No.2) and GND terminal (Pin No.5) of MOSFET and the voltage drop is input to
OCP/FB terminal. The threshold voltage of OCP/FB is set to approx. 0.78V for GND.
5-2) Latch circuit
This circuit stops the operation of power circuit, keeping the oscillator output low when the
overvoltage protection circuit and overheat protection circuit are operated.
Because the circuit current gets less than 400uA when Vin terminal voltage is lower than
operation stop voltage (10V), it begins to increase. Because the circuit current increases
again when it reaches operation start voltage (16V), it decreases. Therefore, this circuit
prevents the Vin terminal voltage from rising, making it goes up and down between 10V and
… 18 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Daewoo DSJ5520 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Daewoo DSJ5520 in the language / languages: English as an attachment in your email.

The manual is 9,85 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info