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參數(shù)資料
| 型號(hào)： | TK65130MTL |
| 廠商： | ASAHI KASEI POWER DEVICES CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 102 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | SOT-23L, SMT-6 |
| 文件頁(yè)數(shù)： | 9/20頁(yè) |
| 文件大小： | 158K |
| 代理商： | TK65130MTL |
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January 2001 TOKO, Inc.
Page 17
TK651xxM
HOW TO MAKE A STEP-DOWN CONVERTER USING THE TK651xx AND AN IRF7524D1 “FETKY” PART
The TK651xx 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 TK651xx. 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 TK651xx 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 TK651xx will not regulate the output, but will continue to pulse its output transistor.
WHERE TO USE THIS STEP-DOWN CONVERTER
The TK65130 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 CCM (continuous current mode). The converter
can and does regulate in DCM (discontinuous current mode) 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
TK65130
U1
10 H
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 F
C3
47 F
6
LOI
R5
R6
300 k
VBATT
VOUT
220 pF
GND
STEP-DOWN CONVERTER APPLICATION
FIGURE 3: STEP-DOWN CONVERTER USING THE TK651xx 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
Type Battery
# of Cells
VBATT Range
VOUT
Typ. Max. IOUT
Oper. Mode
Inductor
Li-ion
2 (Note 1)
5.4 to 8.4 V
3.0 V
500 mA
DCM
10 H
NiMH
4 (Note 2)
4.4 to 5.2 V
3.0 V
500 mA
DCM
10 H
NiMH
6 (Note 2)
6.6 to 7.8 V
3.0 V
500 mA
CCM
120 H
Note: L = 10 H
Toko P/N: 636CY-100M
D73C Coil
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