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MB39C605 데이터시트(PDF) 12 Page - Cypress Semiconductor

부품명 MB39C605
상세설명  Phase Dimmable PSR LED Driver IC for LED Lighting
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제조업체  CYPRESS [Cypress Semiconductor]
홈페이지  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

MB39C605 데이터시트(HTML) 12 Page - Cypress Semiconductor

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Document Number: 002-08444 Rev. *B
Page 12 of 26
MB39C605
8.3
Power-On Sequence
When the AC line voltage is supplied, VBULK is powered from the AC line through a diode bridge and a diode (D1) with charging a
capacitor (CBULK), and the VDD pin is charged from VBULK through a start-up resistance (Rst). (Figure 8-3 red path)
When the VDD pin is charged up and the voltage on the VDD pin (VVDD) rises above the UVLO threshold voltage, an internal Bias
circuit starts operating, and MB39C605 starts the dimming control. After the UVLO is released, this device enables switching and
is operating in a forced switching mode (TON = 1.5 µs, TOFF = 78 µs to 320 µs). When the voltage on the TZE pin reaches the Zero
energy threshold voltage (VTZETH = 0.7V), MB39C605 enters normal operation mode. After the switching begins, the VDD pin is
also charged from Auxiliary Winding through an external diode (DBIAS). (Figure 8-3 blue path)
During start-up period VVDD is not supplied from Auxiliary Winding, because the LED voltage is low. VVDD decreases gradually until
the LED voltage rises above enough high that the Auxiliary Winding voltage can exceed VVDD. In this period, if VVDD falls below the
UVLO threshold voltage, the switching stops. When the VDD pin is charged up again and VVDD rises above the UVLO threshold
voltage, MB39C605 restarts the switching. This device repeats above operation until the LED voltage rises above enough high.
VVDD becomes stable after that.
Figure 8-3. VDD Supply Path at Power-On
Figure 8-4. Power-On Waveform
UVLO
VDD
DRV
CS
GND
Internal Bias
Generator
Driver
VBULK0
PWM
Control
Logic
To TZE
DBIAS
8
6
7
1
VBULK
Phase
Dimmer
Rst
D1
CBULK
VBULK0
DRV
VDD
VLED
TZE
VTZETH = 0.7V
Force switching (TON=1.5µs/TOFF=78µs
to 320µs)
Switching start
UVLO Vth = 13V
Normal switching
VBULK


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