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參數(shù)資料
| 型號： | TPS65530RSLRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.3 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PQCC48 |
| 封裝： | 6 X 6 MM, 0.40 MM PITCH, GREEN, PLASTIC, QFN-48 |
| 文件頁數(shù)： | 15/31頁 |
| 文件大?。?/td> | 931K |
| 代理商： | TPS65530RSLRG4 |
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CH8 Description
SLVS744C – OCTOBER 2007 – REVISED MAY 2008....................................................................................................................................................... www.ti.com
Table 21. Recommended Parts for Capacitor (Output, CH7)
VENDOR
TYPE NO.
CAPACITANCE (
F)
TOLERANCE (%)
SIZE (mm)
Murata
GRM31CB31E106KA75
10.0
10
3.2
× 1.6 × 1.6 (EIA code: 1206)
CH8 uses an external FET. It is based on voltage-mode-controlled synchronous boost converter topology used
for motor control and an IC inside driver. CH8 output should connect to PS (pin 29) because PS is the path to
supply the power for the driver of each channel. This channel has two operation modes – PWM and PFM. The
operation depends on the XSLEEP (pin 7) and ENAFE (pin 6) signal level.
When XSLEEP turns high, CH8 operates as PWM mode. The ENAFE signal level does not matter. For start-up
(less than 2.5 V at CH8 output), CH8 operates as WAKE mode to use the internal MOSFET switch connected to
LL8 (pin 27). The duty cycle of WAKE mode is fixed. After PS voltage reaches 2.5 V, CH8 operation is changed
from WAKE mode to PFM mode automatically. PFM mode is driven by the external MOSFET switch. When PS
voltage reaches 90% of the target voltage, the operation mode is changed from PFM mode to PWM mode
automatically. To operate CH8 in PFM mode only, XSLEEP must be high at first. After that, XSLEEP goes low
and ENAFE is high for PFM mode. PFM operation is recommended for the IC drive only from an efficiency point
of view.
CH8 has reversed current protection to monitor the different voltage between LL8 and PS. The protection
monitors the difference between both PFM mode and PWM mode. When LL8 voltage is larger than PS voltage,
the function is activated. When the function is activated, SW8HD (pin 28) level is changed from high to low;
SW8LD (pin 26) level stays low. This means that LL8 voltage converges the battery voltage naturally.
The recovery condition is dependent on the operation mode. When CH8 operates as PFM mode, the condition is
that FB8 (pin 30) voltage is less than 1.25 V. When CH8 operates as PWM mode, the condition is that LL8
voltage is smaller than PS voltage at the rising edge of the internal clock.
The output voltage is programmable from 3.3 V to 5.5 V to use the feedback loop sensed by the external
resistances. The output voltage is calculated by Equation 9. The block diagram is shown in Figure 11.
VOUT8 = (1 + R1/R2) × 1.25 [V]
(9)
Where:
VOUT8 = Output voltage of CH8 [V]
R1, R2 = Feedback resistance (see Figure 11)
22
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65530
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