CS35L32 datasheet(9/51 Pages) CIRRUS

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DS963F5

CS35L32

3 Characteristics and Specifications

Table 3-4. Boost Converter Characteristics

Test conditions, except where noted otherwise: VA = 1.8 V, VP = 3.6 V, VBST = 5.0 V, amp gain = 12 dB, GNDA = GNDP = 0 V, TA = +25°C

, MCLKINT

= 6 MHz. MCLKINT is explained in Section 4.13.1 and Section 7.7.

Parameters

Symbol

Test Conditions

Min

Typical

Max

Units

Boost output voltage

VBST

Boosting

Bypass

VP*1.15

—

5.4

—

Boost output voltage tolerance

VBST

No load: ILOAD =0 mA

–5

—

Load regulation

V(Load) 3.0 V < VP < 4.2 V; ILOAD= 0.25A to1.5 A

—

mV/A

Line regulation

V(Line)

3.0 V<VP<4.2 V; ILOAD = 0 A, 500 mA

—

mV/V

Boost FET peak-current limit

(See Section 7.10.)

IMAX(B)

BST_IPK = 0000 0000

BST_IPK = 0010 0000

BST_IPK = 0100 0000

BST_IPK = 0110 0000

BST_IPK = 1000 0000

—

2.89

3.30

3.72

4.14

4.56

—

Output switching frequency 1

1.MCLKDIV2 (see p. 37) should be configured so MCLKINT is 6 or 6.1440 MHz (see Table 4-14) for boost-converter operation at 2 or 2.05 MHz.

fSW(B)

——

MCLKINT/3

—

MHz

Boost FET ON resistance

RDS(ON)B

IOUT(B) = 1 A

—



Boost FET ON resistance temp coefficient

—

IOUT(B) = 1 A

—

0.2

—

%/oC

Rectifying FET ON resistance

RDS(ON)R

IOUT(B) = 1 A

—

150

—



Rectifying FET ON resistance temp coefficient

IOUT(B) = 1 A

—

0.2

—

%/oC

Overvoltage detection threshold

VOVTH

Boost enabled

—

5.5

5.7

Threshold Class G On, IN+ to IN–

VIN1THON

VBST = VP = 3.6 V

—

0.60

—

Threshold Class G Off, IN+ to IN–

VIN1THOF

VP = 3.6 V, VBST = 5 V

—

0.33

—

Minimum Class G boost ON hold-off time

—

VP = 3.6 V, VBST = 5 V

—

8002

2.Minimum Class G boost ON hold-off time is determined from when the low audio detection is latched until when the boost is turned off. The latching

mechanism occurs in 800-ms intervals. If the audio level is detected as low between two sequential latches, the hold-off time is extended by the

difference between when the detection occurs and the subsequent latch pulse. This may extend the hold-off time up to 1.6 s in extreme cases.

—ms

Operating efficiency 3

3.Efficiency specified here assumes the boost converter drives an external resistive load via the VBST pin, instead of the onboard Class D amplifier.

B

VBST = 5 V, IOUT(B) = 500 mA

VBST = 5 V, IOUT(B) =1.5 A

—

Table 3-5. LED Drive Characteristics

Test conditions, except where noted otherwise: VA = 1.8 V, VP = 3.6 V, VBST = 5.0 V, GNDA = GNDP = GNDPLED = 0 V, TA = +25°C

Parameters

Min

Typical

Max

Units

Flash Mode current settings, per LED 1

(Step size = 50 mA)

1.Flash or Movie Mode current is delivered from the boost converter’s output, which provides a voltage higher than the LED voltage. Depending on the

LED voltage requirement and on VP supply voltage, the boost converter is internally controlled to boost or be in bypass (rectifying FET fully on).

LED_FLCUR = 1111

…

LED_FLCUR = 0001

—

…

—

750

…

—

…

—

…

Flash Inhibit Mode current settings, per LED 1

(Step size = 50 mA)

LED_FLINHCUR = 0111

…

LED_FLINHCUR = 0001

—

…

—

350

…

—

…

—

…

Movie Mode current settings, per LED 1

LED_MVCUR = 111

LED_MVCUR = 110

LED_MVCUR = 101

LED_MVCUR = 100

LED_MVCUR = 011

LED_MVCUR = 010

LED_MVCUR = 001

—

150

120

100

—

LED current accuracy

–10

—

+10

LED current matching

—10—

Flash timer (tflash)

MCLKINT = 6 MHz 2; TIMER = 1 0010–1 1111

TIMER = 0 0001

TIMER = 0 0000

MCLKINT = 6.144 MHz; TIMER = 1 0010–1 1111

TIMER = 0 0001

TIMER = 0 0000

2.The flash time setting is generated from MCLKINT. MCLKDIV2 (see p. 37) should be configured so MCLKINT is 6 or 6.1440 MHz. See Table 4-14.

—

500

488.3

73.2

48.8

—

LED flash timer accuracy

0—

LED flash inhibit time (FLINH high to LED current 3% settling)

—

s

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