TDA4718 Infineon Technologies AG, TDA4718 Datasheet

Page 1

Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies (SMPS) Features Feed-forward control (line hum suppression) Symmetry inputs for push-pull converter (TDA 4700) Push-pull outputs Dynamic output current limitation Overvoltage protection Undervoltage protection Soft start Double pulse suppression Type Ordering ...

Page 2

Pin Configuration (TDA 4700) (top view) Semiconductor Group 2 TDA 4700 TDA 4718 ...

Page 3

Pin Definitions and Functions (TDA 4700) Pin Symbol 1 GND REF SYM SYNC C 8 soft start filter C ...

Page 4

Pin Configuration (TDA 4718) (top view) Semiconductor Group 4 TDA 4700 TDA 4718 ...

Page 5

Pin Definitions and Functions (TDA 4718) Pin Symbol 1 GND COMP 5 I SYNC 6 IUV 7 IOV 8 – I DYN DYN REF V 11 ...

Page 6

Ramp Generator The ramp generator is triggered by the VCO and oscillates at the same frequency. The duration of the falling edge of the ramp generator waveform shorter than the fall time of the VCO. To control ...

Page 7

Pulse-Turn-OFF Flipflop The pulse turn-OFF flipflop enables the outputs at the start of each half cycle error signal from comparator turn-off signal from K2 is present, the outputs will immediately be switched off. Comparator K3 ...

Page 8

Comparator K7 K7 serves to recognize overcurrents. This is the reason why both inputs of the op amp have been brought out. Turning on is resumed after error recovery at the beginning of the next half period but without using ...

Page 9

Block Diagram (TDA 4700) Semiconductor Group 9 TDA 4700 TDA 4718 ...

Page 10

Block Diagram (TDA 4718) Semiconductor Group 10 TDA 4700 TDA 4718 ...

Page 11

Absolute Maximum Ratings Parameter Supply voltage Voltage at Q1, Q2 Current at Q1, Q2 Symmetry 1, 2 TDA 4700; A Sync output Sync input C Input filter Input R T Input C T Input R R Input C R Input ...

Page 12

Operating Range Parameter Supply voltage Ambient temperature TDA 4700 TDA 4718 TDA 4700 A TDA 4718 A VCO frequency Ramp generator frequency Characteristics – Parameter Symbol ...

Page 13

Characteristics (cont’ – Parameter Symbol Oscillator (VCO) f Frequency range Frequency change Frequency change Tolerance t Fall time sawtooth t RC combination C VCO R Ramp ...

Page 14

Characteristics (cont’ – Parameter Symbol Comparator K2 Input current – Turn-OFF delay V Input voltage Common-mode input V voltage range Soft Start K3, K4 ...

Page 15

Characteristics (cont’ – Parameter Symbol Symmetry (TDA 4700; TDA 4700 A) V Input voltage V Input current – Output Stages Q1 Output voltage V ...

Page 16

Characteristics (cont’ – Parameter Symbol Supply Undervoltage V Turn-ON threshold for V rising S V Turn-OFF threshold V for falling S C Input filter Rated voltage ...

Page 17

Dimensioning Notes for RC Network 1. Determination of the minimum time during which both outputs must be disabled C selection of 2. Determination of the VCO frequency = 2 x output frequency selection Determination of the rated ...

Page 18

Pulse Diagram Semiconductor Group 18 TDA 4700 TDA 4718 ...

Page 19

VCO Frequency versus Semiconductor Group R C and TDA 4700 TDA 4718 ...

Page 20

VCO Temperature Response max VCO with C as parameter ---------------- Semiconductor Group 20 TDA 4700 TDA 4718 ...

Page 21

Current Consumption versus Temperature Semiconductor Group Output Current versus Output Voltage 21 TDA 4700 TDA 4718 ...