Datasheet > CS1612A

CS1612A

更新时间： 2024-01-10 21:39:40

品牌	Logo	应用领域
凌云 - CIRRUS		三端双向交流开关
页数	文件大小	规格书
18页	264K
描述
TRIAC Dimmable LED Driver IC

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CS1612A 数据手册

CS1610A/11A

CS1612A/13A

1. INTRODUCTION

15k

Voltage

Regulator

I_ref

BSTOUT

VDD

ADC

MUX

POR

15k

V_Z

V_{ST(th )}

V_{STP(th )}

IAC

BSTAUX

V_FBZCD(th)

Boost ZCD

t_BSTZCD

GND

Blank

OLP

V_OLP(th)

OCP

SOURCE

V_{SOURCE(th )}

V_{OCP(th )}

Peak

Control

FBSENSE

I_SOURCE

V_{Pk_Max(th)}

DAC

SGND

Output Open

t_FBZCD

Second Stage ZCD

V_{OVP(th )}

VDD

IPK

FBAUX

I_CONNECT

V_FBZCD(th)

MUX

eOTP

VDD

FBGAIN

I_CLAMP

V_{CONNECT(th )}

CLAMP

Figure 1. CS1610A/11A/12A/13A Block Diagram

A typical schematic using the CS1610A/11A for flyback

applications is shown on the previous page.

The output voltage of the CRM boost is sensed by the current

into the boost output voltage sense pin BSTOUT. The quasi-

resonant second stage is implemented with peak-current

mode primary-side control, which eliminates the need for

additional components to provide feedback from the

secondary and reduces system cost and complexity.

Startup current is provided from a patent-pending, external,

high-voltage source-follower network. In addition to providing

startup current, this unique topology is integral in providing

compatibility with digital dimmers by ensuring V_DDpower is

always available to the IC. During steady-state operation, an

auxiliary winding on the boost inductor back-biases the

source-follower circuit and provides steady-state operating

current to the IC to improve system efficiency.

Voltage across an external user-selected resistor is sensed

through pin FBSENSE to control the peak current through the

second stage inductor. Leading-edge and trailing-edge

blanking on pin FBSENSE prevents false triggering.

The rectified input voltage is sensed as a current into pin IAC

and is used to control the adaptive dimmer compatibility

algorithm and extract the phase of the input voltage for output

dimming control. During steady-state operation, the external

high-voltage, source-follower circuit is source-switched in

critical conduction mode (CRM) to boost the input voltage.

This allows the boost stage to maintain good power factor,

provides dimmer compatibility, reduces bulk capacitor ripple

current, and provides a regulated input voltage to the second

stage.

Pin FBAUX is used to sense the second stage inductor

demagnetization to ensure quasi-resonant switching of the

output stage.

When an external negative temperature coefficient (NTC)

thermistor is connected to the eOTP pin, the

CS1610A/11A/12A/13A monitors the system temperature,

allowing the controller to reduce the output current of the

system. If the temperature reaches a designated high set

point, the IC is shutdown and stops switching.

DS976PP4

123 4 5 6 7...18

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