XCL206B153AR-G Torex Semiconductor Ltd, XCL206B153AR-G Datasheet - Page 11
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XCL206B153AR-G
Manufacturer Part Number
XCL206B153AR-G
Description
IC BUCK SYNC 1.5V 0.6A USP-6EL
Manufacturer
Torex Semiconductor Ltd
Series
XCL206r
Type
Point of Load (POL) Non-Isolated with UVLOr
Specifications of XCL206B153AR-G
Output
1.5V
Number Of Outputs
1
Power (watts)
1W
Mounting Type
Surface Mount
Voltage - Input
2 ~ 6 V
Package / Case
USP-6EL
1st Output
1.5 VDC @ 600mA
Size / Dimension
0.10" L x 0.08" W x 0.04" H (2.5mm x 2.0mm x 1.04mm)
Power (watts) - Rated
1W
Operating Temperature
-40°C ~ 85°C
Efficiency
90%
Current - Output
600mA
Voltage - Output
1.5V
Power - Output
1W
Internal Switch(s)
Yes
Frequency - Switching
3MHz
Synchronous Rectifier
Yes
Primary Input Voltage
6V
No. Of Outputs
1
Output Voltage
1.5V
Output Current
600mA
Voltage Regulator Case Style
USP
No. Of Pins
6
Operating Temperature Range
-40°C To +85°C
Svhc
No SVHC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
893-1157 - BOARD EVAL XCL206B153AR-G 1.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
893-1153-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
XCL206B153AR-G
Manufacturer:
TOREX
Quantity:
20 000
The XCL205/XCL/206/XCL207 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver transistor, N-channel
MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuit with control IC, and an inductor.
(See the block diagram above.) Using the error amplifier, the voltage of the internal voltage reference source is compared with
the feedback voltage from the V
error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM
comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit,
and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is
continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver
transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback
signals. This enables a stable feedback loop even when a low ESR capacitor such as a ceramic capacitor is used ensuring
stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally 3.0MHz. Clock pulses generated in
this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal split resistors, R1 and R2. When a feed back voltage is lower than the reference voltage, the
output voltage of the error amplifier is increased. The gain and frequency characteristics of the error amplifier output are fixed
internally to deliver an optimized signal to the mixer.
<Current Limit>
The current limiter circuit of the XCL205/XCL206/XCL207 series monitors the current flowing through the P-channel MOS driver
transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode.
The IC waits for the over current state to end by repeating the steps
milliseconds and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the
driver transistor, and goes into operation suspension state. Once the IC is in suspension state, operations can be resumed by
either turning the IC off via the CE/MODE pin, or by restoring power to the V
complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The
current limit of the XCL205/XCL206/XCL207 series can be set at 1050mA at typical. Depending on the state of the PC Board,
latch time may become longer and latch operation may not work. In order to avoid the effect of noise, an input capacitor is
placed as close to the IC as possible.
When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx pin
at any given timing.
When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over
current state.
When the over current state is eliminated, the IC resumes its normal operation.
OPERATIONAL DESCRIPTION
V
V
V
I
Lx
OUT
Lx
CE
IN
OUT
pin through split resistors, R1 and R2. Phase compensation is performed on the resulting
Limit < # ms
Limit > # ms
through
IN
pin. The suspension state does not mean a
. If an over current state continues for a few
Current Limit LEVEL
XCL205/XCL206/XCL207
Restart
0mA
Vss
11/26
Series