PIP202-12M-2 Datasheet, PDF (3/20 Pages) NXP Semiconductors – DC-to-DC converter powertrain

Philips Semiconductors
PIP202-12M-2
DC-to-DC converter powertrain
6.2 Pin description
Table 2: Pin description
Symbol Pin
I/O
V_DDO
1 to 8, 60, 61,
-
68
[1] [4]
V_SSC
VO
9, 15, 22 to 24 ^{[2] [4]} -
10, 26, 27,
45 to 59,
62 to 67
[3] [4]
O
CB
11, 12
I/O
V_DDC
13, 14
-
VI
16, 17
I
V_SSO
n.c.
28 to 44
-
18 to 21, 25 ^[5]
-
Description
output stage supply voltage
control circuit supply ground
output
bootstrap capacitor connection
control circuit supply voltage
pulse width modulated input
output stage supply ground
no internal connection
[1] All pins connected to PAD1
[2] All pins connected to PAD2
[3] All pins connected to PAD3
[4] PAD1, PAD2 and PAD3 are electrical connections and must be soldered to the printed circuit board
[5] All n.c. pins should be connected to V_SSC.
7. Functional description
7.1 Basic functionality
output stage supply voltage
control circuit supply (12 V)
100
nF
VDDC CB VDDO
input voltage
from PWM controller
VI
VI
VSSC
VO
VSSO
Lout _output
Cout
tp
T
δ=
tp
T
signal ground power ground
03ad36
Fig 3. Simplified functional block diagram of a synchronous DC-to-DC converter
output stage.
In order to understand the functions performed by the PIP202-12M, consider the
requirements of a synchronous DC-to-DC converter output stage, driven from a PWM
controller (Figure 3).
When the input voltage is HIGH, the upper MOSFET must be on and the lower
MOSFET must be off. Current flows from the supply (V_DDO), through the upper
MOSFET and the inductor (L_out), to the output.
9397 750 11943
Product data
Rev. 02 — 24 November 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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