參數(shù)資料
型號： AAT1231ITP-1-T1
廠商： Advanced Analog Technology,lnc.
英文描述： Step-Up DC/DC Converters for White LED Backlight Applications
中文描述： 升壓型DC / DC轉換器，用于白光LED背光應用
文件頁數(shù)： 11/27頁
文件大小： 1535K
代理商： AAT1231ITP-1-T1
AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
1231.2007.01.1.2
11
AAT1231-1 have been designed to offer the sys-
tem designer two choices for the default FB voltage
based on the state of the SEL pin. Changing the
LED current from its initial default setting is easy by
using the S
2
Cwire single wire serial interface; the
FB voltage can be increased (as in the AAT1231;
see Table 2) or decreased (as in the AAT1231-1;
see Table 3) relative to the default FB voltage.
Current Limit and Over-Temperature
Protection
The switching of the N-channel MOSFET termi-
nates when a current limit of 2.5A (typical) is
exceeded. This minimizes power dissipation and
component stresses under overload and short-cir-
cuit conditions. Switching resumes when the cur-
rent decays below the current limit.
Thermal protection disables the AAT1231/1231-1
when internal dissipation becomes excessive.
Thermal protection disables both MOSFETs. The
junction over-temperature threshold is 140°C with
15°C of temperature hysteresis. The output voltage
automatically recovers when the over-temperature
fault condition is removed.
Over-Voltage Protection
Over-voltage protection prevents damage to the
AAT1231/1231-1 during open-circuit or high output
voltage conditions. An over-voltage event is
defined as a condition where the voltage on the
OVP pin exceeds the Over-Voltage Threshold Limit
(V
OVP
= 1.2V typical). When the voltage on the
OVP pin has reached the threshold limit, the con-
verter stops switching and the output voltage
decays. Switching resumes when the voltage on
the OVP pin drops below the lower hysteresis limit,
maintaining an average output voltage between the
upper and lower OVP thresholds multiplied by the
resistor divider scaling factor.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VIN
input. Under-voltage lockout (UVLO) guarantees
sufficient V
IN
bias and proper operation of all inter-
nal circuitry prior to soft start.
Application Information
Over-Voltage Protection
OVP Protection with Open Circuit Failure
The OVP protection circuit consists of a resistor
network tied from the output voltage to the OVP pin
(see Figure 1). To protect the device from open cir-
cuit failure, the resistor divider can be selected
such that the over-voltage threshold occurs prior to
the output reaching 24V (V
OUT(MAX)
). The value of
R3 should be selected from 10k
Ω
to 20k
Ω
to mini-
mize losses without degrading noise immunity.
Figure 1: Over-Voltage Protection Circuit.
Figure 2: Over-Voltage Protection
Open Circuit Response (No LED).
O
I
O
Time (5ms/div)
0
1
2
22
24
26
1.168V
1.224V
R2
R3
C
OUT
VOUT
AAT1231/1231-1
OVP
GND
R
2
= R
3
·
- 1
V
OUT(MAX)
V
OVP
相關PDF資料
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相關代理商/技術參數(shù)
參數(shù)描述
AAT1231ITP-T1 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER
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AAT1232IRN-T1 制造商:Advanced Analogic Tech 功能描述:IC DC/DC CONV STEP UP 24V 100MA
AAT1232ITP-DB1 制造商:Advanced Analogic Tech 功能描述:AAT1232 Series 24 V 100 mA Step-Up DC/DC Converter Eval Board 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1232 Series 24 V 100 mA Step-Up DC/DC Converter Eval Board
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