BD9639MWV_16 Datasheet, PDF (14/26 Pages) Rohm – Switching Regulator ICs

BD9639MWV
(10) CH6
(a) Function
Boost DC/DC converter with built-in load switch.
This channel enables constant voltage operation and constant voltage operation for protection.
The constant voltage is available with output of 2 to 6 LEDs (typ).
The load switch turns OFF when XSHDN6 goes LOW (CH6 shutdown) and the timer latch.
VBAT
O_VU_OT_U6 _T6
FB6
0.4[V]
0.4[V]
SAW
M_MA_AX_X.
DUTY
PRE
DRIVER
VBAT6
C62
LSO6
SW6
L61
Di61
C61
PGND6
O_VU_OT_U6_T6
FB61
R61
Reserv
e
(b) Recommended External Components
Parts
name
Value
Maker
R61
20[Ω]
-
C61
4.7[µF] Taiyo Yuden
C62
1[µF] Taiyo Yuden
L61
10[µH] Taiyo Yuden
Di61
-
ROHM
(c) Start-up Sequence
2.5[V] to 5.5[V]
Part number
-
EMK212BJ475KG
JMK105BJ105KV
NR3015T100M
RB551V-30
VBAT 6
H input voltage
XSHDN 1
XSHDN24
XSHDN 6
0[V]
OUT6
0[V]
H input voltage
≈ VBAT[V]
2 to6 lights output voltage
Electricity is discharged
according to the load .
ON_delay SOFT
Soft start period
6.0[ms]
(d) Set Voltage when Fixed Voltage is Driven
When a fixed voltage is driven by internal resistance, it is set to 16V.
It is possible to return in a set voltage by adding external resistance between OUT6 and FB6.
When a fixed voltage is driven, it becomes 20.1V if 82kΩ is added.
When a fixed voltage is driven, it becomes 22.0V if 120kΩ is added.
However, note the resisting pressure of the capacitance of C61 when stepping up the voltage
applying external resistance.
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TSZ22111・15・001
14/22
TSZ02201-0313AA400630-1-2
09.Feb.2016 Rev.001