TDA4857PS NXP Semiconductors, TDA4857PS Datasheet - Page 35

• Manufacturer Part Number: TDA4857PS
• Manufacturer: NXP Semiconductors

Specifications of TDA4857PS

• Lead Free Status / Rohs Status: Not Compliant

Philips Semiconductors
2001 Apr 11
I
PC monitors
(1) See Fig.19.
Fig.20 I
2
C-bus autosync deflection controller for
no
mode.
2
C-bus flow for protection and standby
S
S
all other register contents are random
STDBY = 1?
Soft-down sequence (XXXX XX00)
8CH
Protection mode (XXXX XX00)
8CH
Standby mode (XXXX XX01)
yes
A
A
registers are set
SOFTST = 0
SOFTST = 0
SOFTST = 0
STDBY = 0
STDBY = 1
STDBY = 0
0DH
0DH
L2
L4
(1)
A
A
SOFTST = 1?
00H
01H
L3
(1)
yes
A P
A P
MBK382
no
35
Protection and standby mode
Soft-down sequence:
Protection mode:
Protection mode can be left by 3 ways:
1. Entering standby mode by setting control
2. Starting the soft start sequence by setting control
3. Decreasing the supply voltage below 8.1 V.
Standby mode:
Start the sequence by setting control bit SOFTST = 0
BDRV duty cycle decreases
HDRV duty cycle decreases.
Pins HDRV and BDRV are floating
Continuous blanking at pin CLBL is active
Pin HUNLOCK is floating
PLL1 and PLL2 are disabled
Register contents are kept in internal memory.
Set control bit STDBY = 1
Driver outputs are floating (same as protection mode)
Supply current is 9 mA
Only the I
Contents of all registers except the value of bit STDBY
and bit SOFTST are lost
See L2 of Fig.19 for continuation.
bit SOFTST = 0 and control bit STDBY = 1
bit SOFTST = 1 (bit STDBY = don’t care);
see L3 of Fig.19 for continuation
2
C-bus and protection circuits are operative
TDA4857PS
Product specification