MAX16805 datasheet(14/19 Pages) MAXIM

부품명	MAX16805

상세설명	EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

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제조업체	MAXIM [Maxim Integrated Products]

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Binning Adjustment Register (0x00)

The Binning Adjustment register is a 4-bit register that

sets the differential regulation voltage reference

between CS+ and CS-. Only the first 4 bits of the data

byte update the Binning Adjustment register. The

remaining 4 bits are ignored. See Table 3. The factory-

default register value is 198mV.

Ramp Peak Register (0x01), MAX16806

The Ramp Peak register is a 3-bit register that sets the

maximum peak value of an internally 200Hz generated

ramp. The ramp signal can be programmed for a peak

value of 1.55V to 2.88V. Only the first 3 bits of the data

byte update the Ramp Peak register. The remaining 5

bits are ignored (see Table 4). The factory-default reg-

ister value is 2.88V.

LED Current Foldback Threshold

(LED_CFT) Register (0x02)

LED_CFT is a 4-bit register that sets the threshold for

the onset of the LED current foldback operation. Only

the first 3 bits of the data byte program the LED_CFT

register. Bit 3, not shown in Table 5, sets the LED cur-

rent foldback range.

The MAX16805/MAX16806 start dimming the LED cur-

rent when the input voltage exceeds the LED current

foldback threshold. For bit 3 = 0, the dimming range is

1.2 times the programmed ramp peak voltage. For bit 3

= 1, the dimming range is 2.4 times the programmed

ramp peak. To disable the LED current foldback feature

of the MAX16805/MAX16806 connect CFT to GND. The

factory-default register value is 16V.

EEPROM-Programmable, High-Voltage, 350mA

LED Drivers with LED Current Foldback

14

______________________________________________________________________________________

REGULATION

VOLTAGE (mV)

BIT 3

BIT 2

BIT 1

BIT 0

HEX

103.0

0000

(0x00)

109.0

0001

(0x01)

115.4

0010

(0x02)

121.8

0011

(0x03)

128.2

0100

(0x04)

134.6

0101

(0x05)

141.0

0110

(0x06)

147.4

0111

(0x07)

153.7

1000

(0x08)

160.1

1001

(0x09)

166.5

1010

(0x0A)

173.0

1011

(0x0B)

179.3

1100

(0x0C)

185.7

1101

(0x0D)

192.1

1110

(0x0E)

198.0

1111

(0x0F)

Table 3. Binning Adjustment

RAMP END

POINT (V)

BIT 2

BIT 1

BIT 0

HEX

1.55

0

(0x00)

1.74

0

1

(0x01)

1.93

0

1

0

(0x02)

2.12

0

1

(0x03)

2.32

1

0

(0x04)

2.51

1

0

1

(0x05)

2.70

1

0

(0x06)

2.88

1

(0x07)

Table 4. Ramp Peak Value

CURRENT

FOLDBACK

THRESHOLD (V)

BIT 2

BIT 1

BIT 0

HEX

16.4

0

(0x00)

15.7

0

1

(0x01)

15.0

0

1

0

(0x02)

14.3

0

1

(0x03)

13.5

1

0

(0x04)

12.8

1

0

1

(0x05)

12.1

1

0

(0x06)

11.4

1

(0x07)

Table 5. LED Current Foldback Threshold

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