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PDF RZ1515 Data sheet ( Hoja de datos )
| Número de pieza | RZ1515 | |
| Descripción | PWM Control 5A Step-Down Converter | |
| Fabricantes | Wuxi Microelectronics | |
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Hay una vista previa y un enlace de descarga de RZ1515 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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Features
- Input voltage: 3.6V to 20V.
- Output voltage: 0.8V to VCC.
- Duty ratio: 0% to 100% PWM control
- Oscillation frequency: 300KHz typ.
- Soft-start, Current Limit, Enable function
- Thermal Shutdown function
- Built-in internal SW P-channel MOS
- SOP8 Pb-Free Package.
Applications
- PC Motherboard
- LCD Monitor
- Graphic Card
- DVD-Video Player
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
- Microprocessor core supply
- Networking power supply
Pin Assignments
FB 1
8 Vss
EN 2
OCSET 3
RZ1515
7 Vss
6 Output
Vcc 4
5 Output
RZ1515
PWM Control 5A Step-Down Converter
General Description
RZ1515 consists of step-down switching regulator
with PWM control. These devices include a
reference voltage source, oscillation circuit, error
amplifier, internal PMOS and etc.
RZ1515 provides low-ripple power, high
efficiency,and excellent transient characteristics.
The PWM control circuit is able to vary the duty
ratio linearly from 0 up to 100%. This converter
also contains an error amplifier circuit as well as a
soft-start circuit that prevents overshoot at startup.
An enable function, an over current protect
function and a short circuit protect function are
built inside, and when OCP or SCP happens, the
operation frequency will be reduced from 300KHz
to 50KHz. Also, an internal compensation block is
built in to minimum external component count.
With the addition of an internal P-channel Power
MOS, a coil, capacitors, and a diode connected
externally, these ICs can function as step-down
switching regulators. They serve as ideal power
supply units for portable devices when coupled
with the SOP8 mini-package, providing such
outstanding features as low current consumption.
Since this converter can accommodate an input
voltage up to 20V, it is also suitable for the
operation via an AC adapter.
Pin Descriptions
Name
FB
EN
OCSET
VCC
Output
Vss
Pin
1
2
3
4
56
78
Description
Feedback pin.
Power-off pin
H: Normal operation
(Step-down operation)
L: Step-down operation
stopped
(All circuits deactivated)
Add an external resistor to set
max output current.
IC power supply pin
Switch Pin. Connect external
inductor/diode here. Minimize
trace area at this pin to reduce
EMI.
GND Pin
Tel. 0510-85898501 18061979821 Fax. 0510-85898500
1/6 Rev. 1.0 2009-10
1 page  
RZ1515
PWM Control 5A Step-Down Converter
Function Description
PWM Control
The RZ1515 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system.
In converters of the RZ1515, the pulse width varies
in a range from 0 to 100%, according to the load
current. The ripple voltage produced by the
switching can easily be removed through a filter
because the switching frequency remains constan.
Therefore, these converters provide a
low-ripple power over broad ranges of input
voltage and load current.
Under Voltage Lockout
The under voltage lockout circuit of the RZ1515
assures that the high-side MOSFET driver outputs
remain in the off state whenever the supply voltage
drops below 3.3V. Normal operation resumes once
VCC rises above 3.5V.
RDS(ON) Current Limiting
The current limit threshold is setting by the
external resistor connecting from VCC supply to
OCSET. The internal 100uA sink current crossing
the resistor sets the voltage at pin of OCSET.
When the PWM voltage is less than the voltage at
OCSET, an over-current condition is triggered.
I LOAD × RDS(ON) = IOCSET × R OCSET
See above formula for setting the current limit
value.
Marking Information
Tel. 0510-85898501 18061979821 Fax. 0510-85898500
5/6 Rev. 1.0 2009-10
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet RZ1515.PDF ] | |
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