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TK65020 Datasheet(PDF) 11 Page - TOKO, Inc

Part # TK65020
Description  STEP-UP VOLTAGE CONVERTER
Download  14 Pages
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK65020 Datasheet(HTML) 11 Page - TOKO, Inc

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ADVANCED INFORMATION
January 1999 TOKO, Inc.
Page 11
TK65020
HOW TO MAKE A STEP-DOWN CONVERTER USING THE TK65020 AND AN IRF7524D1 “FETKY” PART
The TK65020 can be used as a controller in a step-down converter with the following two additional changes. See Fig 3.
1) Change the main switch orientation for use in a step-down converter. An external P-channel power MOSFET is
used as the main switch in a step-down converter configuration. The gate of FET is turned on through a resistor divider
being pulled down to GND by the internal output transistor of the TK65020. This application requires both a logic level
P-channel MOSFET and a Schottky diode. An IRF7524D1 “FETKY” part contains both in a small micro 8 package.
2) Change the voltage seen at the V
IN pin of the TK65020 to below the regulation voltage at the VOUT pin. A resistor
divider between the converter V
IN and the chip VIN pin drops the voltage seen at the VIN pin. If the VIN pin is a higher voltage
than the V
OUT pin, the TK65020 will not regulate the output, but will continue to pulse its output transistor.
WHERE TO USE THIS STEP-DOWN CONVERTER
The TK65020 is a Pulse Burst Modulation (PBM) controller with a fixed duty cycle of approximately 50%. Therefore, only
if V
BATT is more than twice the voltage of VOUT can the converter run in Continuous Current Mode (CCM). The converter
can and does regulate in Discontinuous Current Mode (DCM) for lighter output current loads with V
IN less than twice the
voltage of V
OUT. But DCM produces more peak current and more ripple current than CCM. Below is a table giving some
examples of where this type of step-down converter might be used.
1 k
+
R3
150
R4
10 k
R1
3.9 k
R2
TK65125
U1
10 µH
C2
U2
L1
3
1
4
2
5
VIN
VOUT
GND
SW
IRF7524D1
1,2
4
3
R7
1 k
C1
5,6,
7,8
+
47 µF
C3
47 µF
6
NC
VBATT
VOUT
220 pF
GND
STEP-DOWN CONVERTER APPLICATION
FIGURE 3: STEP-DOWN CONVERTER USING THE TK65020 SCHEMATIC
Note 1: Li-ion cell voltage range 2.7 V to 4.2 V
Note 2: NiMH cell voltage range 1.1 V to 1.3 V
Note: L = 10
µH
Toko P/N: 636CY-100M
D73C Coil
Type Battery
# of Cells
VBATT Range
VOUT
Typ. Max IOUT
Oper Mode
Inductor
Li-ion
2 (Note 1)
5.4 to 8.4 V
2.5 V
500 mA
DCM
10
µH
NiMH
4 (Note 2)
4.4 to 5.2 V
2.5 V
500 mA
DCM
10
µH
NiMH
6 (Note 2)
6.6 to 7.8 V
2.5 V
500 mA
CCM
120
µH


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