UMC33167L-TA5-T Datasheet, PDF (6/8 Pages) Unisonic Technologies – LINEAR INTEGRATED CIRCUIT

UMC33167
Advance
LINEAR INTEGRATED CIRCUIT
 TYPICAL APPLICATION CURRENT
+
Oscillator
+
- _PWM
I_{LIMIT +}
-
S
Q
R
PWM Latch
+
UVLO ^-
V_IN
12V
4
V_CC
+
C_IN
330μF
2 ^SW
D1
1N5825
Thermal
Shutdown
3 _GND
+
100μA
120
5.50V
Reference
EA ₊
-
5
COMP _CF
R_F
0.1u+F
68K
L
190uH
+
1 ^{FB R2}
6.8K
V_O
5.05V/5.0A
+ _CO
4700uF
R₁
The Step-Down Converter application is shown in Figure 3. The output switch transistor Q1 interrupts the input
voltage, generating a squarewave at the LCO filter input. The filter averages the squarewaves, producing a dc output
voltage that can be set to any level between VIN and VREF by controlling the percent conduction time of Q1 to that of
the total oscillator cycle time. If the converter design requires an output voltage greater than 5.05V, resistor R1 must
be added to form a divider network at the feedback input.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-070.c