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參數(shù)資料
| 型號(hào)： | THMC40SOPD |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| 中文描述： | 變速12伏直流無(wú)刷風(fēng)扇電機(jī)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 9/17頁(yè) |
| 文件大小： | 238K |
| 代理商： | THMC40SOPD |
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THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
charge pump (CP)
THMC40 and THMC41 have an internal charge pump which utilizes an external reservoir capacitor (CP) to
generate the gate-drive voltage for the V
OUT
output high-side DMOS transistor (see Figure 3). The
recommended value for CP is 0.1
μ
F, with a minimum rating of 35 WVdc. The charge pump is disabled during
the sleep state (see the sleep/run state section) to minimize current consumption into V
PWR
. The charge pump
also incorporates internal undervoltage lockout detection used to disable V
OUT
when the charge pump voltage
does not have an adequate level above V
PWR
to fully drive the high-side DMOS gate. Thus, the V
CP
(UVLO),
in conjunction with the charge pump start-up time, delays the V
OUT
drive for a short time after the device has
transitioned from sleep to run state, until the charge pump voltage reaches the UVLO threshold.
PWM oscillator/triangle waveform generator (C
OSC
)
The PWM oscillator uses source and sink currents switched into an external capacitor (C
OSC
) to set the PWM
frequency and generate a triangle waveform. A PWM oscillator cycle consists of charging C
OSC
with a constant
current source (–180
μ
A typical) until the C
OSC
voltage ramps up to an upper threshold (2.3 V typical), and then
discharging C
OSC
with a constant current sink (180
μ
A typical) until the C
OSC
voltage ramps down to a lower
threshold (0.5 V typical). The charge/discharge cycle is repeated each time the 2.3-V or 0.5-V threshold is
reached (see Figure 5).
V
2.3 V
S
R
Q
Q
VREF
VPWR
COSC
VPWM
2200 pF
PWM
–180
μ
A
2.3 V
0.5 V
180
μ
A
Time
0.5 V
0
Q
Q
VCOSC
Figure 5. PWM Triangle Waveform Generator
The following equation can be used to calculate the value of C
OSC
needed for a desired PWM frequency, f
PWM
:
I
CHARGE(min)
C
OSC(max)
2
f
PWM(min)
V
DISCHARGE
V
CHARGE
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