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| 型號(hào)： | TPS65200YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
| 封裝： | 2.80 X 2.60 MM, 0.40 MM PITCH, GREEN, DSBGA-36 |
| 文件頁數(shù)： | 17/59頁 |
| 文件大小： | 2424K |
| 代理商： | TPS65200YFFT |
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DISABLED
WLED BOOST
ON
WLED_EN = 0 &
CTRL = L
POWER DOWN
FAULT
CTRL = L &
WLED_EN=0
FAULT
BOOST is turned off
CTRL = L means CTRL pin is low for>2.5ms
|| = OR
& = AND
(
?) = rising edge
(
?) = falling edge
WLED_EN = 1 ||
CTRL = H
SLVSA48 – APRIL 2010
www.ti.com
Figure 44. State Diagram for WLED Driver
Under Voltage Lockout
An under voltage lockout circuit prevents operation of the WLED driver at input voltages (CSOUT pin) below
2.2 V. When the input voltage is below the under voltage threshold, the driver is shutdown and the internal switch
FET is turned off. If the input voltage rises by 70 mV above the under voltage lockout hysteresis, the WLED
driver restarts. An internal thermal shutdown turns off the device when the typical junction temperature of 165°C
is exceeded. The device is released from shutdown automatically when the junction temperature decreases by
10°C.
Shutdown
To minimize current consumption the WLED driver is shutdown when the WLED_EN bit is low and the CTRL pin
is pulled low for more than 2.5 ms. Although the internal FET does not switch in shutdown, there is still a DC
current path between the input and the LEDs through the inductor and Schottky diode. The minimum forward
voltage of the LED array must exceed the maximum input voltage to ensure that the LEDs remain off in
shutdown. However, in the typical application with two or more LEDs, the forward voltage is large enough to
reverse bias the Schottky and keep leakage current low.
Soft-Start Circuit
Soft-start circuitry is integrated into the WLED driver to avoid a high inrush current during start-up. After the
device is enabled, the voltage at FB pin ramps up to the reference voltage in 32 steps, each step takes 213 s.
This ensures that the output voltage rises slowly to reduce the input current. Additionally, for the first 5 ms after
the COMP voltage ramps, the current limit of the switch is set to half of the normal current limit specification.
During this period, the input current is kept below 400 mA (typical).
Open LED Protection
Open LED protection circuitry prevents IC damage as the result of white LED disconnection. The TPS65200
monitors the voltage at the SWL pin during each switching cycle. The circuitry turns off the switch FET and shuts
down the WLED driver as soon as the SWL voltage exceeds the VOVP threshold for eight clock cycles. As a
result, the output voltage falls to the level of the input supply. The WLED driver remains in shutdown mode until it
is enabled by toggling the CTRL pin or the WLED_EN bit of the CTRL register.
24
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65200
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