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Número de pieza RZ3111A
Descripción PWM Control 3A Step-Down Converter
Fabricantes Wuxi Microelectronics 
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RZ3111A
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
RZ3111A consists of step-down switching regulator with PWM control. These devise include a
reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
RZ3111A provides low-ripple power, high efficiency, and excellent transient characteristics. The
PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter is build out soft
start function that prevents overshoot and inrush current at startup. An over current protect function and
short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency
will be reduced. The operating frequency is decided by outside resistance. An external compensation is
easily to system stable.
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-EP with exposed pad package, providing such
outstanding features as low current consumption. Since this converter can accommodate an input
voltage up to 40V, it is also suitable for the operation via an AC adapter.
FEATURES
- Input voltage 4.2V to 40V
- Output voltage 0.8V to 38V
- Duty ratio 0% to 100% PWM control
- Oscillation frequency range is 50K 500KHz by outside resistance setting
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP8-EP Pb-Free package.
Block Diagram
FB
OCSET
COMP
OSC
Reference Voltage
Source with Soft Start
Vcc
+
Oscillation
Circuit
PWM-Switched
Control Circuit
Thermal
VEN Shutdown
EN
SW
60uA VSS
V1.0 2010-10
Tel. 0510-85898501 18061979821 Fax. 0510-85898500
1/7

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RZ3111A pdf
RZ3111A
PWM Control 3A Step-Down Converter
Application Information
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output version.The
external resistor sets the output voltage according to the following equation:
Table 1 Resistor select for output voltage setting
VOUT
5V
R4
1.3K
R5
6.8K
3.3V
1.5K
4.7K
2.5V
2.2K
4.7K
1.8V 2K 2.5K
1.5V
2.2K
2.0K
1.2V 2K 1K
Inductor Selection
For most designs, the different frequency can be reducing the inductor value; The RZ3111A is
suggested 15µH to 160µH for 50K to 500KHz frequencies. Please refer the below table to design.
L1 recommend value (VIN=8~40V ,VOUT=5V, IOUT=3A)
Frequency (Hz) 300KHz~500KHz 200K~300KHz 100K~200K
L1 Value (uH)
10uH ~ 22uH
22uH ~47uH 33uH ~68uH
50K~100K
68uH ~160uH
Where is inductor Ripple Current. Large value inductors lower ripple current and small value
inductors result in high ripple currents. Choose inductor ripple current approximately 20% of the
maximum load current 3A, IL=0.6A. The DC current rating of the inductor should be at least equal to
the maximum load current plus half the ripple current to prevent core saturation (3A+0.3A).
Input Capacitor Selection
This capacitor should be located close to the IC using short leads and the voltage rating should be
approximately 1.5 times the maximum input voltage. The RMS current rating requirement for the input
capacitor of a buck regulator is approximately 12 the DC load current. A low ESR input capacitor sized
for maximum RMS current must be used. A 470µF low ESR capacitor for most applications is sufficient.
V1.0 2010-10
Tel. 0510-85898501 18061979821 Fax. 0510-85898500
5/7

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