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BD8355MWV Datasheet(PDF) 8 Page - Rohm

Part # BD8355MWV
Description  Regulators ICs for Digital Cameras and Camcorders System Switching Regulator IC with Built-in FET (10V)
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD8355MWV Datasheet(HTML) 8 Page - Rohm

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Technical Note
8/20
BD8355MWV
www.rohm.com
2011.12 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
Functional Description / peripheral devices setting
1.
Internal Regulator (VREGA, VREGD)
Both VREGA and VREGD are internal regulator of 3.6 V output. Bypass VREGA/VREGD to GND with a capacitor be-
tween 0.47 µF and 2.2 µF. In addition, it needs care for the voltage between VREGA and VREGD not to excess 0.3 V
to avoid IC malfunctions.
2.
Control block (SHUT DOWN)
Inputting voltages to CTL14, 2, 35, 6, and 7 control ON/OFF of respective channels. Note that it is impossible to inde-
pendently control CH1 and 4, and to independently control CH3 and 5. In addition, turn on any CTL1-6 and wait 500
usec before turning on CTL7. Input higher voltage than 2 V to CTL14, 2, 35, or 6 to turn on each channel. Open or in-
put voltage -0.3 ~ 0.4 V to those to turn off. Input 2 ~ 5.5 V to CTL7 to turn on CH7. Open or input voltage -0.3 ~ 0.4 V
to CTL7 to turn off. The states of output terminals (Lx1-7), FB terminals, SCP/SCP6 terminals, and internal regulator
(VREGA and VREGD) are written below.
Each CTL terminal contains pull down resistor of 1MΩ (typ.)
14
2
35
67123
456712
34567
LLL
LLLLL
LLL H-Z LL
LLLLLL
LLL
HL
L
L
L
A
L
L
A
L
L H-Z A
L
L
A
LLL
A
A
A
L
L
H
L
LLL
A
L
LLL H-Z L
A
LLLLL
A
A
A
L
LL
H
LLLL
A
L
A
L H-Z L
L
AL
AL
L
A
A
A
L
LLL
H
LLLL
LL
A H-Z LL
LLL
A
L
A
A
L
A
L* L* L* L*
H
L* L* L* L* L* L*
A
L* L* L* L* L* L*
AAAA
L*
H
H
H
H
H
A
AAAAAA
AAAAAA
AAAAA
A: active
SCP6
* Turn on any CTL1-6 before turn on CTL7. Conditions of Lx1 ~ 6, FB1 ~ 6, SCP6 are
changed with active channel.
CTL
Lx
FB
VREGA VREGD
SCP
3.
Output voltage/current setting
Fig. 7 Setting of feedback resistance
(a) Setting output voltage of CH1-6
The reference voltages of ERROR AMP. are 0.8 V (CH1) and 1 V (CH2-6). The output voltages are determined as
equation (1) and (2). Set the value of feedback resistance R1 and R2 which are connected to INV1-6 pin.
(b) Setting output current of CH7
The reference voltage of CH7 ERROR AMP. is 0.3 V. The current flowing LED is determined as equation (3). Set
the value of feedback resistance R3, considering the tolerance current of LED.
4.
Startup/Stop sequence
To avoid rush current on startup, each channel has soft start function. The output voltage of CH1 reaches to the target
in Tss1=2.5msec (typ.) and the output voltage of CH2 ~ 6 reaches to the target in Tss2-6=3.1msec (typ.). In case of
CH7, the output of error amplifier is restricted in TDTC7=15msec (typ.).
Note that Tss1-6, TDTC7 vary from typical value Ttyp as following with setting of switching frequency.
5.
Protection matrix
The following table displays state of outputs when protection is operating.
Lx1-5 Lx6
Lx7 FB1-6 FB7 VREGA VREGD HVREG SCP SCP6
Short Circuit Protection (CH1-5,7)
H-Z
A
H-Z
A
A
A
A
A
-
A
Short Circuit Protection (CH6)
A
H-Z
A
A
A
A
A
A
A
-
Under Voltage Lockout (VCC)
H-Z
H-Z
H-Z
NA
NA
A
A
NA
NA
NA
Under Voltage Lockout (VREGA)
H-Z
H-Z
H-Z
NA
NA
-
A
NA
NA
NA
Under Voltage Lockout (VREGD)
H-Z
H-Z
H-Z
NA
NA
A
-
NA
NA
NA
Under Voltage Lockout (HVREG)
H-Z
H-Z
A
NA
A
A
A
-
NA
NA
Thermal Shutdown (TSD)
H-Z
H-Z
H-Z
NANA
NANANANANA
A: active
NA: non-active


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