Hotchip HT2263MP, HT2263AP, HT2263CP Schematic [ru]

HT2263

Current Mode PWM Controller

GENERAL DESCRIPTION

HT2263 is a highly integrated current mode PWM

control IC optimized for high performance, low

standby power and cost effective offline flyback

converter applications in sub 30W range.

PWM switching frequency at normal operation is

externally programmable and trimmed to tight

range. At no load or light load condition, the IC

operates in extended ‘burst mode’ to minimize

switching loss. Lower standby power and higher

conversion efficiency is thus achieved.

VDD low startup current and low operating

current contribute to a reliable power on startup

design with HT2263. A large value resistor could

thus be used in the startup circuit to minimize the

standby power.

The internal slope compensation improves

system large signal stability and reduces the

possible sub-harmonic oscillation at high PWM

duty cycle output. Leading-edge blanking on

current sense(CS) input removes the signal glitch

due to snubber circuit diode reverse recovery and

thus greatly reduces the external component

count and system cost in the design.

Excellent EMI performance is achieved with

frequency shuffling technique together with soft

switching control at the totem pole gate drive

output.

Tone energy at below 20KHZ is minimized in the

design and audio noise is eliminated during

operation. HT2263 is offered in SOT23-6, SOP-8

and DIP-8 packages.

FEATURES

 Extended Burst Mode Control For Improved

Efficiency and Minimum Standby Power

Design.

 Audio Noise Free Operation

 External Programmable PWM Switching

Frequency

 Internal Synchronized Slope Compensation

 Low VDD Startup Current and Low Operating

Current (1.4mA)

 Leading Edge Blanking on Current Sense

Input

 Good Protection Coverage With Auto

Self-Recovery

 VDD Over Voltage Clamp and Under Voltage

Lockout with Hysteresis (UVLO)

 Gate Output Maximum Voltage Clamp (18V)

HT2263 offers complete protection coverage with

automatic self-recovery

Cycle-by-Cycle current limiting (OCP), over load

protection (OLP), VDD over voltage clamp and

under voltage lockout (UVLO). The Gate-drive

output is clamped to maximum 18V to protect the

power MOSFET.

feature including

 Line Input Compensated Cycle-by-Cycle

Over-current Threshold Setting For Constant

Output Power Limiting Over Universal Input

Voltage Range.

 Overload Protection (OLP)

Ver1.0

1

APPLICATIONS

HT2263

Offline AC/DC flyback converter for

 Battery Charger

 Power Adaptor

 Set-Top Box Power Supplies

 Open-frame SMPS

BLOCK DIAGRAM

TYPICAL APPLICA TION

Ver1.0

2

GENERAL INFORMATION

Pin Configuration

The HT2263 is offered in SOT23-6, DIP8

and SOP8 packages, shown as below.

Package Dissipation Rating

Package RθJA (°C/W)

DIP8 90

SOP8 150

SOT23-6 200

Absolute Maximum Ratings

Parameter Value

VDD DC Supply Voltage 30 V

VDD Zener Clamp

Voltage

VDD DC Clamp Current 10 mA

VFB Input Voltage -0.3 to 7V

V

Note

Input Voltage to

SENSE

VDD_Clamp+0.1V

-0.3 to 7V

Ordering Information

Part Number Description

HT2263MP SOT23-6, Pb-free

HT2263AP DIP8, Pb-free

HT2263CP SOP8, Pb-free

Sense Pin

VRI Input Voltage to RI Pin -0.3 to 7V

Min/Max Operating

Junction Temperature TJ

Min/Max Storage

Temperature T

Note

: VDD_Clamp has a nominal value of 34V.

Stresses beyond those listed under “absolute

maximum ratings” may cause permanent damage

to the device. These are stress ratings only,

functional operation of the device at these or

any other conditions beyond those indicated

under “recommended operating conditions” is not

implied. Exposure to absolute maximum-rated

conditions for extended periods may affect device

reliability.

stg

-20 to 150 oC

-55 to 160 oC

TERMINAL ASSIGNMENTS

Ver1.0

3

HT2263

Pin Name I/O Description

GND P Ground

FB I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin

and SENSE pin input.

RI I Internal Oscillator frequency setting pin. A resistor connected between RI and GND

sets the PWM frequency.

SENSE I Current sense input pin. Connected to MOSFET current sensing resistor node.

VDD P Chip DC power supply pin.

GATE O Totem-pole gate drive output for the power MOSFET.

RECOMMENDED OPERATING CONDITION

Symbol Parameter

VDD VDD Supply Voltage 10 to 30 V

RI RI Resistor Value 100 Kohm

TA Operating Ambient Temperature -20 to 85

Min － Max

Unit

o

C

ELECTRICAL CHARACTERISTICS

(TA = 25OC if not otherwise noted)

Symbol Parameter Test Conditions Min Typ Max Unit

Supply Voltage (VDD)

I_VDD_Startup VDD Start up

Current

I_VDD_Ops Operation Current VDD=16V,

UVLO(ON) VDD Under Voltage Lockout Enter 7.5 8.5 9.5 V

VDD =12.5V, RI=100K

Measure Leakage

current into VDD

RI=100Kohm, VFB=3V

3 20 uA

1.4 mA

UVLO(OFF) VDD Under Voltage Lockout Exit

(Recovery)

VDD_Clamp VDD Zener Clamp Voltage I

Feedback Input Section(FB Pin)

A

PWM Input Gain

VCS

VFB_Open VFB Open Loop Voltage 4.8 V

IFB_Short FB pin short circuit current Short FB pin to GND

VTH_0D Zero Duty Cycle FB Threshold

Voltage

Ver1.0

13.5 14.5 15.5 V

= 5 mA 34 V

VDD

ΔV

/ΔVcs

FB

and measure current

VDD = 16V,

RI=100Kohm

2.0 V/V

1 mA

0.75 V

4