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RV5VH Datasheet

  • RV5VH

  • DC/DC CONVERTER CONTROLLER

  • 47頁

  • RICOH

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RV5VH3
脳脳
OPERATION
鈥?DC/DC Converter 1
RV5VH3
脳脳
V
DD
3
CSW
1
Vref
+
OSC
鈥?/div>
Error Amp.1
p_shift
4
VFM1
Cb
V
IN
EXT1
Rb
NPN Tr.
2
R2
FB1 R1
SBD
L1
C
V
OUT1
The DC/DC1 can operate by an input voltage to the V
DD
pin. A change in the V
OUT1
will feed back to the internal error
amplifier through external voltage setting resistors and internal feed back resistors. When the feed back voltage is lower
than the reference voltage, the error amplifier enables oscillation or otherwise, it will stop oscillation. The internal feed back
resistor 鈥淩鈥?which is fixed and adjusted by laser trim can make the feed back input voltage to 鈥淓rror Amp.1鈥?stable.
Pulses from the 鈥淥SC鈥?circuit have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the 鈥淧_shift鈥?circuit.
These clock pulses control VFM circuit and make it possible to operate as a boost converter.
The output of 鈥淓XT1鈥?is driven by CMOS buffer and an external NMOS driver is also available instead of an NPN transis-
tor, in such cases the Rb and the Cb are not necessary. The DC/DC1 can be shut down by CSW pin. When the CSW pin
is 鈥淗鈥? V
DD
level, the DC/DC1 is enabled and when the CSW pin is 鈥淟鈥? GND level, the DC/DC1 is disabled. The EXT1
pin outputs 鈥淟鈥?while the DC/DC1 is disabled.
鈥?Set Output Voltage DC/DC1
V
OUT1
is described as follows :
V
OUT1
: R1+R2=VFB1 : R2
V
OUT1
=VFB1
脳
(R1+R2) / R2
thus, any output voltage of DC/DC1 can be set by changing R1 or/and R2.
Certain temperature coefficient of V
OUT1
can be set by using R1, R2 having such temperature characteristics.
DC/DC1 controls VFB1 to be a constant voltage,
38

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