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參數(shù)資料
| 型號： | MAX1712 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs |
| 中文描述： | 高速、數(shù)字可調、降壓型控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 437K |
| 代理商： | MAX1712 |
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M
High-Speed, Digitally Adjusted
Step-Down Controllers for Notebook CPUs
12
______________________________________________________________________________________
low-side switch current is below the current-limit thresh-
old, and the minimum off-time one-shot has timed out.
On-Time One-Shot (TON)
The heart of the PWM core is the one-shot that sets the
high-side switch on-time. This fast, low-jitter, adjustable
one-shot includes circuitry that varies the on-time in
response to battery and output voltage. The high-side
switch on-time is inversely proportional to the battery
voltage as measured by the V+ input, and directly pro-
portional to the output voltage as set by the DAC code.
This algorithm results in a nearly constant switching fre-
quency despite the lack of a fixed-frequency clock gen-
erator. The benefits of a constant switching frequency
are twofold: first, the frequency can be selected to avoid
noise-sensitive regions such as the 455kHz IF band;
second, the inductor ripple-current operating point
remains relatively constant, resulting in easy design
methodology and predictable output voltage ripple:
On-Time = K (V
OUT
+ 0.075V) / V
IN
where K is set by the TON pin-strap connection and
0.075V is an approximation to accommodate for the
expected drop across the low-side MOSFET switch.
One-shot timing error increases for the shorter on-time
settings due to fixed propagation delays and is approxi-
mately ±12.5% at 550kHz and 400kHz, and ±10% at the
two slower settings. This translates to reduced switch-
ing-frequency accuracy at higher frequencies (Table 5).
Switching frequency increases as a function of load cur-
rent due to the increasing drop across the low-side
Table 1. MAX1710 FB Output Voltage
DAC Codes
D3
D2
D1
D0
OUTPUT
VOLTAGE (V)
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.65
Table 2. MAX1711 FB Output Voltage
DAC Codes
D4
D3
D2
D1
OUTPUT
VOLTAGE (V)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1.60
1.55
1.50
1.45
1.40
1.35
1.30
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.65
Shutdown3*
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1.075
1.050
1.025
1.000
0.975
0.950
0.925
Shutdown3*
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
*See Table 4.
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