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| 型号： | TPS40021PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 19/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWP |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
26
REFERENCE DESIGN
MOSFETs and Diodes
For a 1.5-V output voltage, the lower the RDS(on) of the MOSFET, the higher the efficiency. Due to the high
current and high conduction loss, the MOSFET should have very low conduction resistance (RDS(on)) and
thermal resistance. Si7858DP is chosen for its low RDS(on) (between 3 m and 4 m) and Power-Pak package.
Current Limiting
Resistor R3 sets the short current limit threshold. The RDS(on) of the upper MOSFET is used as a current sensor.
The current limit, IOUT(CL) is initialized at 30% above the maximum output current, IOUT(max), which is 28 A. Then
R3 can be calculated in equation (11) and yields a value of 1.4 k
. An R3 of 1.43 k is selected.
I
LIM +
19
V
FB
R4
+ 19
0.69 V
118 k
W +
111.1 (
mA)
R3
+
K
R
DS(on)
I
OUT(CL)
I
LIM
+ 1.5
0.004
28 A
I
LIM
+ 1.4 (kW)
where
D RDS(on) is the on-resistor of Q1 (4 m)
D Temperature coefficient, K=1.5
D VFB = 0.69 V
D R4=118 k
Voltage Sense Regulator
R1 and R2 operate as the output voltage divider. The error amplifier reference voltage (VFB) is 0.69 V. The
relationship between the output voltage and divider is described in equation (8). Using a 10-k
resistor for R2
and 1.5-V output regulation, R1 is calculated as 8.52 k
, 8.66 k is selected for R1.
V
FB
R1
+
V
OUT
R1
) R2
0.69 V
R1
+
1.5 V
R1
) 10 kW
R1 + 8.52 kW
Transient Comparator
The output voltage transient comparators provide a quick response, first strike, approach to output voltage
transients. The output voltage is sensed through a resistor divider at the OSNS pin, using R5 and R6 shown
in Figure 27. If an overvoltage condition is detected, the HDRV gate drive is shut off and the LDRV gate drive
is turned on until the output is returned to regulation. Similarly, if an output undervoltage condition is sensed,
the HDRV gate drive goes to 95% duty cycle to pump the output back up quickly. The voltage divider should
be exactly the same as resistors R1 and R2 discussed previously. Resistor R5=8.66 k
and R6=10 k in this
evaluation module.
(14)
(15)
(16)
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