参数资料
型号: TPS65530ARSLT
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: 0.6 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PQCC48
封装: 6 X 6 MM, 0.40 MM PITCH, GREEN, PLASTIC, VQFN-48
文件页数: 13/32页
文件大小: 923K
代理商: TPS65530ARSLT
CH7 Description
LED
BADJ
SENSE
0.2
0.05
I
=
V
+
R
(7)
SLVS835C – APRIL 2008 – REVISED APRIL 2009............................................................................................................................................................ www.ti.com
Table 16. Recommended Parts for Capacitor (Output, CH6)
VENDOR
TYPE NO.
CAPACITANCE (
F)
TOLERANCE (%)
SIZE (mm)
Murata
GRM31CB31E106KA75
10.0
10
3.2 × 1.6 × 1.6 (EIA code: 1206)
Table 17. Recommended Parts for Diode (CH6)
VENDOR
TYPE NO.
VR (V)
IF (mA)
VF (V)/IF (A)
CAPACITANCE (pF)
SIZE (mm)
Sanyo
SB0503EJ
30
500
0.55/0.5
16.5
1.6 × 0.8 × 0.6
CH7 is the voltage-mode-controlled nonsynchronous boost converter for the backlight LED. The switch between
the inductor and power GND is integrated into the device and consists of NMOS-FET. Also, this device has a
load switch to control the output current and consists of NMOS-FET. The output current is constant and is
calculated by Equation 7. It is controlled by the B_ADJ (pin 32) input voltage as shown in Figure 8. The B_ADJ
input voltage is required as an analog input. When it is required to input PWM signal for B_ADJ, the RC filter is
needed.
Where:
ILED = Output current of CH7 [A]
RSENSE = Sense resistor between FBC and PGND5/7 []
VBADJ = B_ADJ input voltage (0 < VBADJ < 1) [V]
Figure 8. Output Current vs B_ADJ Input Voltage (RSENSE = 10
)
The principle of the operation is to adjust the duty cycle of the MOSFET. When the B_ADJ input voltage is
changed, the level of “A” point shown in Figure 9 is changed to get the desired duty cycle compared to the sense
current.
20
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS65530A
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