Datasheet > CS1616-FZZ

CS1616-FZZ

更新时间： 2022-04-14 00:11:23

品牌	Logo	应用领域
APEX		控制器
页数	文件大小	规格书
16页	387K
描述
Single Stage Dimmable Offline AC/DC Controller for LED Lamps

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数据手册

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CS1616-FZZ 数据手册

CS1615/16

1. INTRODUCTION

VDD

Voltage

Regulator

VDD

V_DD(on)

V_DD(off)

POR

V_Z

GND

Blank

OLP

I_ref

15k

V_{OLP(th )}

ADC

IAC

OCP

V_OCP(th)

Peak

Control

FBSENSE

SOURCE

V_SOURCE(th)

V_{Pk_Max}

(th )

DAC

V_{FSTART(th )}

t_VAUX

SGND

Output

Overvoltage

V_{OVP(th )}

VDD

Zero-current

Detect

CTRL1

FBAUX

CLAMP

V_ZCD(th)

VDD

I_CONNECT

MUX

eOTP

I_CLAMP

CTRL2

V_CONNECT(th)

Figure 1. CS1615/16 Block Diagram

A typical schematic using the CS1615/16 IC is shown on the

previous page.

The digital dual-mode controller is implemented with peak-

current mode primary-side regulation, which eliminates the need

for additional components to provide feedback from the

secondary and reduces system cost and complexity. Voltage

across a user-selected resistor is sensed through pin FBSENSE

to control the peak current of the primary-side inductor. Leading-

edge and trailing-edge blanking on pin FBSENSE prevents false

triggering. The required target LED current and average flyback

transformer and buck-boost inductor input current are set by

attaching resistors R_CTRL1and R_CTRL2on pins CTRL1 and

CTRL2, respectively. The controller ensures half line-cycle

averaged constant output current.

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 normal operation, an auxiliary winding on the

flyback transformer or buck-boost inductor back-biases the

source-follower circuit and provides steady-state operating

current to the IC to improve system efficiency.

Rectified input voltage V_rectis sensed as a current into pin IAC

and is used to control the adaptive dimmer-compatibility

algorithm and to extract the phase of the input voltage for output

dimming control. The SOURCE pin is used to provide a control

signal for the high-voltage source-follower circuit during Leading-

edge Mode and Trailing-edge Mode; it also provides the current

during startup.

Pin FBAUX is used for zero-current detection to ensure

quasi-resonant switching of the single stage output. When an

external negative temperature coefficient (NTC) thermistor is

connected to pin eOTP, the CS1615/16 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 shut down and stops switching.

DS961F1

123 4 5 6 7...16

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