Datasheet > BD83A44EFV-M

BD83A44EFV-M

更新时间： 2024-04-09 18:58:41

品牌	Logo	应用领域
罗姆 - ROHM		/
页数	文件大小	规格书
50页	2338K
描述
This IC is a white LED driver for LCD backlight. It has MOS for boost and 4ch current drivers for

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BD83A44EFV-M 数据手册

BD83A44EFV-M BD83A44MUF-M

Description of Blocks – continued

Detect Conditions and Operation at Detection of Each Protection Function (All values in the table are Typ values)

Operation at Detection

Detect Condition

Protection Function

(Block Name)

No.

Load

DC/DC

Current

Driver

FAIL

[Detect]

[Release]

Switch Switching

Under Voltage

Lockout

VCC ≤ 4.10 V

VCC ≥ 4.25 V

and

High

(Note 5)

OFF

(UVLO)

V_REG≤ 3.95 V

V_REG≥ 4.10 V

Thermal Shutdown

LED

Tj ≥ 175 °C

Tj ≤ 150 °C

OFF

Low

(TSDLED)

Thermal Shutdown

REG

OFF

(TSDREG)

Overcurrent

Protection

(OCPL)

High

(Note 5)

I_SW≥ 3.6 A

I_SW< 3.6 A

OFF

Overvoltage

Protection

(OVP)

V_OVP≥ 1.21 V

V_OVP≤ 1.16 V

Low

Only

LED Open

Protection

(OPEN Det)

V_LEDn^{(Note 1)}≤ 0.3 V

and

V_EN= Low^{(Note 6)}

detection Latch

LED pin

is OFF

Only

Low

V_OVP≥ 1.21 V

Detects UVLO

LED Short

Protection

Detects

V_EN= Low^{(Note 6)}

detection Latch

V_LEDn^{(Note 1)}≥ 5.0 V

for 3.56 ms or more^{(Note 2)}

LED pin

is OFF

Low

(SHORT Det)

Detects UVLO

Detects

V_LEDn^{(Note 1)}≤ 0.3 V

Short Circuit

Protection

(SCP)^{(Note 3)}

V_EN= Low^{(Note 6)}

Latch

Low

OFF

V_OVP≤ 0.1 V

Detects UVLO

for 3.56 ms or more

Detects

Input

voltage between the

Overcurrent

Protection

(OCPH)^{(Note 3)}

ISET-GND

voltage between the

VCC-CSH pin ≥ 0.1 V

for 10 μs or more

VCC-CSH pin < 0.1 V

OFF

Low

(Note 4)

ISET resistor ≤ 3.5 kΩ

ISET resistor > 3.5 kΩ

10 Short Protection

(ISET Pin Fault)

(when V_ADIM= V_REG

)

(when V_ADIM= V_REG)

(Note 1) LEDn indicates one of the LED1 to LED4 pins.

(Note 2) LED pin voltage of at least 1 channel shall be less than V_LEDCTL(MIN)x 1.2. When LED pin voltages of all channels are 2.4 V or more, the LED short protection

does not operate. Since the 3.56 ms counter is counted up only when PWM = High, the time until SHORT Det is detected varies depending on PWM Duty.

(Note 3) When Short Circuit Protection (SCP) and Input Overcurrent Protection (OCPH) are detected at the same time, the operation of Input Overcurrent Protection

takes precedence.

(Note 4) When 56.96 ms elapses after the load switch is turned OFF, the load switch turns ON. At this time, when the voltage between the VCC-CSH pin ≥ 0.1 V, the

load switch, DC/DC switching, and current driver are turned OFF again. Also, when the voltage between the VCC-CSH pin < 0.1 V, Self Diagnosis is

performed and restarted.

(Note 5) When pulled up to any voltage, it becomes High output.

(Note 6) The Low width of EN need 10 µs or more.

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TSZ02201-0T2T0B200460-1-2

9/47

TSZ22111 • 15 • 001

08.May.2023 Rev.001

1...6 7 8910 11 12...50

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与BD83A44EFV-M相关器件

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